Method for measuring arsenic content in predetermined environment

Abstract

The embodiment of the invention relates to the technical field of measurement of material components, in particular to a method for measuring the arsenic content in a predetermined environment, which mainly comprises the following steps: treating a sample, and dissolving the sample in an aqua regia solution; converting the aqua regia solution into a dilute nitric acid solution; determining the relationship between the arsenic concentration and the arsenic intensity of the arsenic-containing solution measured by using an inductively coupled plasma mass spectrometer; determining the strength of arsenic in the dilute nitric acid solution by using an inductively coupled plasma mass spectrometer; and determining the content of the arsenic in the predetermined environment according to the relationship between the arsenic concentration and the strength of the arsenic and the strength of the arsenic in the dilute nitric acid solution. In the embodiment of the invention, the aqua regia solution is adopted to extract the sample, the interference of impurity arsenic in the hydrofluoric acid solution is avoided, and the aqua regia solution containing the sample is converted into the dilute nitric acid solution, so that the interference of hydrochloric acid in the aqua regia solution on the measurement of the inductively coupled plasma mass spectrometry is eliminated; therefore, the accuracy of measuring the arsenic content in the environmental sample is improved.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of measuring material components, and particularly to a method for measuring the arsenic content in a predetermined environment. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] With the rapid development of industrialization, the discharge of industrial wastewater, waste gas, and waste residue has led to a large amount of heavy metal elements being discharged into the environment, exacerbating the problem of heavy metal pollution in the environment. Among them, after arsenic enters the human body through the environment, it can cause diseases such as skin lesions, nervous system damage, and abnormal liver and kidney functions, posing a serious threat to human life and health. Therefore, in order to reduce the harm of arsenic to the human body, it is necessary to measure the arsenic content in the environment. Summary of the Invention

[0004] A brief overview of the present application is given below to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0005] In a first aspect, embodiments of the present application provide a method for measuring the arsenic content in a predetermined environment, which includes the following steps: S10: Obtain a sample from the predetermined environment; S20: Process the sample and dissolve it in aqua regia solution; S30: Convert the aqua regia solution in step S20 into a dilute nitric acid solution; S40: Determine the relationship between the arsenic concentration and the arsenic intensity of the solution containing arsenic measured by an inductively coupled plasma mass spectrometer; S50: Use the inductively coupled plasma mass spectrometer to determine the arsenic intensity in the dilute nitric acid solution in step S30; S60: Determine the arsenic content in the predetermined environment according to the relationship determined in step S40 and the intensity determined in step S50.

[0006] In the embodiments of the present application, aqua regia solution is used to extract the sample, which improves the extraction efficiency of the sample and effectively avoids the interference of impurity arsenic in hydrofluoric acid solution on the measurement of arsenic content, thus significantly improving the accuracy of measuring the arsenic content in environmental samples. In addition, by converting the aqua regia solution containing the sample into a dilute nitric acid solution, the reaction between hydrochloric acid in the aqua regia solution and argon gas of the inductively coupled plasma mass spectrometer to generate chlorine argon ions is avoided, which causes interference to inductively coupled plasma mass spectrometry analysis. Therefore, while ensuring the measurement accuracy of arsenic content, the requirement for the resolution of the inductively coupled plasma mass spectrometer is reduced, and the operability of measuring the arsenic content in the predetermined environment is improved.

[0007] Second aspect, an embodiment of the present application provides a method for measuring the arsenic content in a predetermined environment, which includes the following steps: S10: Obtain a sample from the predetermined environment; S20: Process the sample and dissolve it in the first aqua regia solution, and at the same time obtain a second aqua regia solution that is not used to dissolve the sample, and the second aqua regia solution is the same as the first aqua regia solution; S30: Convert the first aqua regia solution in which the sample is dissolved in step S20 into a first dilute nitric acid solution, perform the same treatment on the second aqua regia solution as on the first aqua regia solution to obtain a second dilute nitric acid solution; S40: Determine the relationship between the arsenic concentration and the arsenic intensity of the solution containing arsenic measured by an inductively coupled plasma mass spectrometer; S50: Use an inductively coupled plasma mass spectrometer to determine the arsenic intensity in the first dilute nitric acid solution in step S30 and the arsenic intensity in the second dilute nitric acid solution; S60: Determine the arsenic concentration in the first dilute nitric acid solution according to the relationship determined in step S40 and the intensity in the first dilute nitric acid solution determined in step S50, and determine the arsenic concentration in the second dilute nitric acid solution according to the relationship determined in step S40 and the intensity of arsenic in the second dilute nitric acid solution determined in step S50; S70: Determine the arsenic content in the predetermined environment according to the arsenic concentration in the first dilute nitric acid solution and the arsenic concentration in the second dilute nitric acid solution.

[0008] In the embodiment of the present application, the first aqua regia solution is used to extract the sample, which improves the extraction efficiency of the sample and effectively avoids the interference of impurity arsenic in the hydrofluoric acid solution on the measurement of arsenic content. In addition, converting the first aqua regia solution into the first dilute nitric acid solution avoids the interference of the reaction between hydrochloric acid in the first aqua regia solution and argon gas of the inductively coupled plasma mass spectrometer to generate chlorine argon ions on the inductively coupled plasma mass spectrometry analysis. Further, by performing the same treatment on the second aqua regia solution as on the first aqua regia solution to obtain a second dilute nitric acid solution, the consistency of the test conditions of the first dilute nitric acid solution and the second dilute nitric acid solution is ensured. And, the arsenic content in the predetermined environment is determined according to the arsenic solution and the arsenic intensity of the first dilute nitric acid solution and the second dilute nitric acid solution, considering the interference of impurity arsenic in the aqua regia solution on the measurement of arsenic content, and further improving the accuracy and reliability of the measurement of arsenic content in the predetermined environment. Description of the Drawings

[0009] Through the description of the embodiments of the present application with reference to the drawings below, other objects and advantages of the present application will be obvious and can help to comprehensively understand the present application.

[0010] Figure 1 is a flowchart of the method for measuring the arsenic content in a predetermined environment according to the first aspect embodiment of the present application;

[0011] Figure 2 is a flowchart of the method for measuring the arsenic content in a predetermined environment according to the second aspect embodiment of the present application.

[0012] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner that does not affect the reader's understanding. Detailed implementation manners

[0013] In the following, exemplary embodiments of the present application will be described with reference to the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation manners are described in the specification. However, it should be understood that many implementation-specific decisions must be made during the development of any such actual embodiment in order to achieve the specific goals of the developer, for example, to comply with those constraints related to the system and the business, and these constraints may vary with different implementation manners. In addition, it should also be understood that although the development work may be very complex and time-consuming, for those skilled in the art who benefit from the content of the present application, such development work is merely a routine task.

[0014] Here, it should also be noted that in order to avoid obscuring the present application due to unnecessary details, only the device structures and / or processing steps closely related to the solution according to the present application are shown in the accompanying drawings, while other details less related to the present application are omitted.

[0015] The inventors of the present application have found that in the existing methods for measuring the arsenic content in the environment, samples of the environment are usually extracted using hydrochloric acid, nitric acid, hydrofluoric acid, and perchloric acid. However, there are problems of low extraction efficiency when using hydrochloric acid, nitric acid, hydrofluoric acid, and perchloric acid to extract environmental samples. Moreover, hydrofluoric acid usually contains different concentrations of impurity arsenic, and after sub-boiling purification treatment, there is still a relatively high arsenic residue in the hydrofluoric acid, which reduces the accuracy of measuring the arsenic content in the environment.

[0016] Based on this, the embodiments of the present application provide a method for measuring the arsenic content in a predetermined environment. Figure 1 It is a flowchart of the method for measuring the arsenic content in a predetermined environment according to the first aspect embodiment of the present application. As Figure 1 shown, it includes the following steps: S10: Obtain a sample from a predetermined environment; S20: Process the sample and dissolve it in aqua regia solution; S30: Convert the aqua regia solution in step S20 into a dilute nitric acid solution; S40: Determine the relationship between the arsenic concentration and the intensity of arsenic in the solution containing arsenic measured by an inductively coupled plasma mass spectrometer; S50: Use an inductively coupled plasma mass spectrometer to determine the intensity of arsenic in the dilute nitric acid solution in step S30; S60: Determine the arsenic content in the predetermined environment according to the relationship determined in step S40 and the intensity determined in step S50.

[0017] In the embodiment of the present application, an aqua regia solution is used to extract the sample, which improves the extraction efficiency of the sample and effectively avoids the interference of the impurity arsenic in the hydrofluoric acid solution on the arsenic content measurement, thereby significantly improving the accuracy of the arsenic content measurement in the environmental sample. In addition, by converting the aqua regia solution containing the sample into a dilute nitric acid solution, the hydrochloric acid in the aqua regia solution and the argon gas of the inductively coupled plasma mass spectrometer to generate chlorine argon ions to interfere with the inductively coupled plasma mass spectrometry analysis, thereby ensuring the accuracy of the arsenic content measurement while reducing the requirements for the resolution of the inductively coupled plasma mass spectrometer, and improving the operability of the arsenic content measurement in the predetermined environment.

[0018] In some embodiments, step S20 also includes the following steps: S21: crushing the sample to a predetermined size and weighing a predetermined weight of the sample; S22: dissolving the sample using a predetermined concentration of aqua regia solution.

[0019] In the embodiments of the present application, the sample is crushed to a predetermined size to ensure that the size of the crushed sample particles is uniform so that it can be fully and quickly dissolved in a water regia solution of a predetermined concentration to form an aqua regia solution containing the sample with uniform composition.

[0020] In some embodiments, the predetermined size may be 74 μm, so that the crushed sample particles can be dissolved more quickly and fully in the aqua regia solution, so that the aqua regia solution can extract the sample and arsenic more completely, further improving the accuracy of arsenic content measurement.

[0021] In some embodiments, the predetermined weight can be set to 0.25 g, and the predetermined concentration of aqua regia solution can be a solution of aqua regia and secondary deionized water mixed in a volume ratio of 1:1 to ensure that the sample can be fully dissolved in the aqua regia solution after crushing, thereby forming an aqua regia solution with uniform composition containing the sample.

[0022] In some embodiments, step S22 also includes the following steps: S221: heating the aqua regia solution at a predetermined temperature for a predetermined time; S222: diluting the solution obtained in S221 to a predetermined volume and letting it stand for a predetermined time.

[0023] In the embodiment of the present application, the solubility of the aqueous regia solution in the sample is increased by heating the aqueous regia solution, the dissolution of the sample in the aqueous regia solution is accelerated, and the aqueous regia solution extracts the sample more completely. The aqueous regia solution after the sample is extracted is fixed to a certain volume and allowed to stand, which prolongs the dissolution time of the sample in the aqueous regia solution, so as to obtain an aqueous regia solution containing the sample with uniform composition.

[0024] In some embodiments, the predetermined temperature can be set to 90° C., and the predetermined time can be set to 1 hour, which effectively improves the solubility of the sample in the aqua regia solution and the extraction efficiency of the sample by the aqua regia solution, making the aqua regia solution extract the sample more completely.

[0025] In some embodiments, the aqueous regia solution can be heated by water bath heating. The uniform heat transfer property of water bath heating can be utilized to eliminate the temperature difference at various locations in the aqueous regia solution, thereby ensuring that the solubility of the sample at various locations in the aqueous regia solution is the same, further improving the composition uniformity of the aqueous regia solution containing the sample.

[0026] In some embodiments, the predetermined capacity can be set to 25 mL, and the predetermined time can be set to 5 hours, so that the sample can be completely dissolved in the aqueous regia solution, ensuring the uniformity and stability of the aqueous regia solution containing the sample, and at the same time, allowing impurities insoluble in the aqueous regia solution to completely settle to the bottom of the aqueous regia solution.

[0027] In some embodiments, step S30 also includes the following steps: S31: heating the aqua regia solution to a predetermined temperature and evaporating it to near dryness; S32: adding a predetermined amount of sub-boiling concentrated nitric acid to the solution of S31, heating it to a predetermined temperature and evaporating it to near dryness; S33: adding nitric acid of a predetermined concentration and fixing the volume to a predetermined volume.

[0028] In the embodiments of the present application, since the boiling point of the nitric acid-water azeotrope is higher than that of the hydrochloric acid-water azeotrope, the aqua regia solution is heated to a predetermined temperature and evaporated to near dryness, so that the hydrochloric acid in the aqua regia solution is preferentially evaporated, thereby achieving the preliminary removal of the hydrochloric acid in the aqua regia solution. Sub-boiling concentrated nitric acid is then added to the solution containing the sample to avoid the introduction of new impurities during the second evaporation of the solution, and to achieve the secondary removal of the hydrochloric acid in the aqua regia solution. By adding nitric acid of a predetermined concentration, the evaporated solution is redissolved, and the redissolved solution is fixed to a predetermined volume, so as to achieve the conversion of the solution from the aqua regia solution system to the nitrate solution system, and eliminate the interference of the hydrochloric acid in the aqua regia solution system with the test accuracy of the inductively coupled plasma mass spectrometer.

[0029] In some embodiments, the predetermined temperature in step S31 may be set to 130° C. to prevent the predetermined temperature from being too high, which may cause volatilization of arsenic in the solution and reduce the accuracy of measuring the arsenic content.

[0030] In some embodiments, the predetermined amount in step S32 may be 1 mL.

[0031] In some embodiments, the nitric acid of the predetermined concentration in step S33 may be a solution of concentrated nitric acid and secondary deionized water mixed in a volume ratio of 1:1.

[0032] In some embodiments, the aqueous regia solution in step S31 may be the supernatant of the predetermined amount of aqueous regia solution obtained in step S222. The supernatant in the aqueous regia solution is obtained to avoid interference from insoluble impurities at the bottom of the aqueous regia solution. For example, the predetermined amount may be 2 mL.

[0033] In some embodiments, after step S32 and before step S33, the following steps are further included: adding sub-boiling nitric acid and evaporating it to dryness at a temperature higher than a predetermined temperature to ensure effective removal of hydrochloric acid in the solution containing the sample. Exemplarily, the temperature higher than the predetermined temperature can be set to 150 °C, so that while the solution containing the sample is quickly evaporated to dryness, it is ensured that the hydrochloric acid in the solution has been completely removed.

[0034] In some embodiments, step S40 further includes: S41: preparing multiple arsenic-containing solutions with known arsenic concentrations in each solution; S42: measuring the intensity of arsenic in the solutions in step S41 using an inductively coupled plasma mass spectrometer; S43: determining the relationship between the arsenic concentration and the intensity of arsenic in the arsenic-containing solutions measured using the inductively coupled plasma mass spectrometer according to the arsenic concentration of the solutions in step S41 and the intensity of arsenic in the solutions in step S42.

[0035] In the embodiments of the present application, the intensity of arsenic in multiple arsenic solutions with known arsenic concentrations is measured using an inductively coupled plasma mass spectrometer. Then, according to the arsenic concentrations and intensities of the multiple arsenic solutions, the conversion relationship between the arsenic concentration and the intensity is determined, and based on the conversion relationship between the arsenic concentration and the intensity, the free conversion between the arsenic concentration and the intensity is achieved.

[0036] In some embodiments, in step S41, arsenic-containing solutions with known concentrations and different volumes are obtained; the arsenic-containing solutions are diluted with a nitric acid solution of a predetermined concentration to obtain multiple arsenic-containing solutions with known arsenic concentrations in each solution.

[0037] In the embodiments of the present application, arsenic-containing solutions with different volumes and known concentrations are diluted with a nitric acid solution of a predetermined concentration, thereby obtaining multiple arsenic-containing solutions with different concentrations. Moreover, according to the concentration of the nitric acid solution and the volume of the arsenic-containing solution with a known concentration, the arsenic concentrations of the multiple arsenic-containing solutions with different concentrations can be accurately determined.

[0038] In some embodiments, a standard solution for an inductively coupled plasma mass spectrometer containing arsenic can be selected as the arsenic-containing solution with a known concentration to ensure the accuracy and reliability of the measurement results of the inductively coupled plasma mass spectrometer for multiple arsenic-containing solutions.

[0039] In some embodiments, the predetermined concentration is 2%, so that a 2% nitric acid solution is used to achieve stepwise dilution of arsenic-containing solutions with different volumes, and then multiple arsenic-containing solutions with different concentrations are obtained.

[0040] In some embodiments, step S42 further includes: obtaining a standard solution containing an internal standard element at a predetermined concentration. Since the long-term operation of an inductively coupled plasma mass spectrometer may cause the signal of the arsenic element detected by it to shift, introducing an internal standard element can monitor the state of the inductively coupled plasma mass spectrometer in real time, thereby improving the accuracy of the inductively coupled plasma mass spectrometer in detecting the arsenic element signal.

[0041] In some embodiments, rhodium can be selected as the internal standard element, and the predetermined concentration can be set to 10 μg / L. Since rhodium can be stably ionized in the plasma and has high stability, selecting rhodium as the internal standard element can effectively improve the accuracy of the arsenic element intensity test.

[0042] In some embodiments, the standard solution containing rhodium at a predetermined concentration can be prepared from a standard solution for inductively coupled plasma mass spectrometry containing rhodium. The concentration of the standard solution for inductively coupled plasma mass spectrometry containing rhodium can be 1000 μg / mL. Specifically, a 2% nitric acid solution can be used to gradually dilute the standard solution with a rhodium concentration of 1000 μg / mL to 10 μg / L, so that the ionization behavior of the rhodium element in the inductively coupled plasma mass spectrometer can be consistent with that of the arsenic element, thereby realizing real-time monitoring of the state of the inductively coupled plasma mass spectrometer.

[0043] In some embodiments, between step S41 and step S42, it further includes: setting the working parameters of the inductively coupled plasma mass spectrometer, and optimizing and adjusting the sensitivity, double-charge yield, and oxide yield of the inductively coupled plasma mass spectrometer with a tuning solution to ensure the normal operation of the inductively coupled plasma mass spectrometer, improve the sensitivity of the inductively coupled plasma mass spectrometer, and reduce the interference of double charges and oxides, further improving the stability and reliability of the analysis results of the inductively coupled plasma mass spectrometer.

[0044] In some embodiments, in step S43, according to the concentration of the solution containing arsenic and the corresponding intensity of arsenic, a relationship curve between the concentration and intensity of arsenic in the solution containing arsenic is fitted, where the abscissa of the relationship curve is the concentration of arsenic and the ordinate is the intensity of arsenic. According to the corresponding relationship between the concentration of arsenic on the abscissa and the intensity of arsenic on the ordinate in the relationship curve, the mutual conversion between the concentration of arsenic and the intensity of arsenic is realized.

[0045] In some embodiments, step S60 further includes: according to the relationship curve between the concentration and intensity of arsenic in the solution containing arsenic and the intensity of arsenic in the dilute nitric acid solution in step S50, determining the concentration value of the abscissa corresponding to the intensity value of the dilute nitric acid solution on the ordinate in the relationship curve, and the concentration value of the abscissa is the content of arsenic in the predetermined environment.

[0046] The inventors of the present application have found that aqua regia solution may contain impurity arsenic, which causes interference with the measurement results of arsenic content.

[0047] Based on this, an embodiment of the present application further provides a method for measuring the arsenic content in a predetermined environment. Figure 2 It is a flowchart of the method for measuring the arsenic content in a predetermined environment according to the embodiment of the second aspect of the present application. As Figure 2 shown, it includes the following steps: S10: Obtain a sample from a predetermined environment; S20: Process the sample and dissolve it in a first aqua regia solution, and at the same time obtain a second aqua regia solution that is not used to dissolve the sample, and the second aqua regia solution is the same as the first aqua regia solution; S30: Convert the first aqua regia solution in which the sample is dissolved in step S20 into a first dilute nitric acid solution, perform the same treatment on the second aqua regia solution as on the first aqua regia solution to obtain a second dilute nitric acid solution; S40: Determine the relationship between the arsenic concentration and the arsenic intensity of the solution containing arsenic measured by an inductively coupled plasma mass spectrometer; S50: Use the inductively coupled plasma mass spectrometer to determine the arsenic intensity in the first dilute nitric acid solution in step S30 and the arsenic intensity in the second dilute nitric acid solution; S60: Determine the arsenic concentration in the first dilute nitric acid solution according to the relationship determined in step S40 and the intensity in the first dilute nitric acid solution determined in step S50, and determine the arsenic concentration in the second dilute nitric acid solution according to the relationship determined in step S40 and the intensity in the second dilute nitric acid solution determined in step S50; S70: Determine the arsenic content in the predetermined environment according to the arsenic concentration in the first dilute nitric acid solution and the arsenic concentration in the second dilute nitric acid solution.

[0048] In the embodiment of the present application, the first aqua regia solution is used to extract the sample, which improves the extraction efficiency of the sample and effectively avoids the interference of impurity arsenic in the hydrofluoric acid solution on the measurement of arsenic content. In addition, converting the first aqua regia solution into a first dilute nitric acid solution avoids the interference of the reaction between hydrochloric acid in the first aqua regia solution and argon gas of the inductively coupled plasma mass spectrometer to generate chlorine argon ions on the inductively coupled plasma mass spectrometry analysis. Further, by performing the same treatment on the second aqua regia solution as on the first aqua regia solution to obtain a second dilute nitric acid solution, the consistency of the test conditions of the first dilute nitric acid solution and the second dilute nitric acid solution is ensured, and the arsenic content in the predetermined environment is determined according to the arsenic solution and the arsenic intensity of the first dilute nitric acid solution and the second dilute nitric acid solution, taking into account the interference of impurity arsenic in the aqua regia solution on the measurement of arsenic content, and further improving the accuracy and reliability of the measurement of arsenic content in the predetermined environment.

[0049] In some embodiments, in step S70, the relationship among the arsenic concentration in the first dilute nitric acid solution, the arsenic concentration in the second dilute nitric acid solution, and the arsenic content in the predetermined environment conforms to the following expression:

[0050]

[0051] Wherein, C represents the content of arsenic in a predetermined environment, with the unit of μg / L; C1 represents the concentration of arsenic in the first dilute nitric acid solution, with the unit of μg / L; C0 represents the concentration of arsenic in the second dilute nitric acid solution, with the unit of μg / L; V1 represents the volume of the first aqua regia solution obtained by dissolving the sample in step S20, with the unit of mL; V2 represents the volume of the first aqua regia solution in the initial state in step S30, with the unit of mL; V3 represents the volume of the first dilute nitric acid solution in step S30, with the unit of mL; M represents the weighed sample amount of the sample, with the unit of g.

[0052] In the embodiments of the present application, by determining the relationship expression between the concentrations of arsenic in the first dilute nitric acid solution and the second dilute nitric acid solution and the content of arsenic in the predetermined environment, the interference of impurity arsenic in the aqua regia solution on the measurement of the arsenic content in the predetermined environment is eliminated. Thus, based on the concentrations of arsenic in the first dilute nitric acid solution and the second dilute nitric acid solution, the accurate measurement of the arsenic content in the predetermined environment can be achieved.

[0053] In some embodiments, step S40 further includes: S41: preparing a plurality of arsenic-containing solutions, each with a known arsenic concentration; S42: measuring the intensity of arsenic in the solutions in step S41 using an inductively coupled plasma mass spectrometer; S43: determining the relationship between the arsenic concentration and the intensity of arsenic in the arsenic-containing solutions measured using the inductively coupled plasma mass spectrometer according to the arsenic concentration of the solutions in step S41 and the intensity of arsenic in the solutions in step S42.

[0054] In the embodiments of the present application, the intensity of arsenic in a plurality of arsenic solutions with known arsenic concentrations is measured using an inductively coupled plasma mass spectrometer. Then, according to the arsenic concentrations and intensities of the plurality of arsenic solutions, the conversion relationship between the arsenic concentration and the intensity of arsenic is determined, and based on the conversion relationship between the arsenic concentration and the intensity of arsenic, the free conversion between the arsenic concentration and the intensity of arsenic is achieved.

[0055] In some embodiments, in step S41, arsenic-containing solutions with different volumes and known concentrations are obtained; the arsenic-containing solutions are diluted using a nitric acid solution with a predetermined concentration to obtain a plurality of arsenic-containing solutions, each with a known arsenic concentration.

[0056] In the embodiments of the present application, arsenic-containing solutions with different volumes and known concentrations are diluted using a nitric acid solution with a predetermined concentration, thereby obtaining a plurality of arsenic-containing solutions with different concentrations. Moreover, according to the concentration of the nitric acid solution and the volume of the arsenic-containing solutions with known concentrations, the arsenic concentrations of the plurality of arsenic-containing solutions with different concentrations can be accurately determined.

[0057] In some embodiments, a standard solution containing arsenic for an inductively coupled plasma mass spectrometer can be selected as the solution containing arsenic with a known concentration, so as to ensure the accuracy and reliability of the measurement results of the inductively coupled plasma mass spectrometer for multiple solutions containing arsenic.

[0058] In some embodiments, the predetermined concentration is 2%, so as to achieve stepwise dilution of solutions containing arsenic with different volumes by using a 2% nitric acid solution, and then obtain multiple solutions containing arsenic with different concentrations.

[0059] In some embodiments, the S42 step further includes: obtaining a standard solution containing an internal standard element with a predetermined concentration. Since the long-term operation of the inductively coupled plasma mass spectrometer will cause the signal of the arsenic element detected by it to shift, the introduction of the internal standard element can monitor the state of the inductively coupled plasma mass spectrometer in real time, and then improve the accuracy of the inductively coupled plasma mass spectrometer in detecting the arsenic element signal.

[0060] In some embodiments, rhodium can be selected as the internal standard element, and the predetermined concentration can be set to 10 μg / L. Since rhodium can be stably ionized in the plasma and has high stability, therefore, selecting rhodium as the internal standard element can effectively improve the accuracy of the arsenic element intensity test.

[0061] In some embodiments, the standard solution containing rhodium with a predetermined concentration can be prepared from a standard solution for an inductively coupled plasma mass spectrometer containing rhodium. The concentration of the standard solution for an inductively coupled plasma mass spectrometer containing rhodium can be 1000 μg / mL. Specifically, a 2% nitric acid solution can be used to stepwise dilute the standard solution with a rhodium concentration of 1000 μg / mL to 10 μg / L, so that the ionization behavior of the rhodium element in the inductively coupled plasma mass spectrometer can be consistent with that of the arsenic element, thereby realizing real-time monitoring of the state of the inductively coupled plasma mass spectrometer.

[0062] In some embodiments, between the S41 step and the S42 step, it further includes: setting the working parameters of the inductively coupled plasma mass spectrometer, and optimizing and adjusting the sensitivity, double-charge yield and oxide yield of the inductively coupled plasma mass spectrometer with a tuning solution to ensure the normal operation of the inductively coupled plasma mass spectrometer, improve the sensitivity of the inductively coupled plasma mass spectrometer, and reduce the interference of double charges and oxides, and further improve the stability and reliability of the analysis results of the inductively coupled plasma mass spectrometer.

[0063] In some embodiments, in step S43, a relationship curve between the arsenic concentration and the arsenic intensity of the arsenic-containing solution is fitted according to the concentration of the arsenic-containing solution and the corresponding arsenic intensity, wherein the abscissa of the relationship curve is the arsenic concentration and the ordinate is the arsenic intensity. According to the corresponding relationship between the arsenic concentration of the abscissa and the arsenic intensity of the ordinate in the relationship curve, the mutual conversion between the arsenic concentration and the arsenic intensity is achieved.

[0064] In some embodiments, step S20 also includes the following steps: S21: crushing the sample to a predetermined size and weighing a predetermined weight of the sample; S22: dissolving the sample using a first aqua regia solution of a predetermined concentration.

[0065] In the embodiments of the present application, the sample is crushed to a predetermined size to ensure that the size of the crushed sample particles is uniform so that it can be fully and quickly dissolved in a water regia solution of a predetermined concentration to form an aqua regia solution containing the sample with uniform composition.

[0066] In some embodiments, the predetermined size can be 74 μm, so that the crushed sample particles can be dissolved more quickly and fully in the first aqua regia solution, so that the first aqua regia solution can extract the sample and arsenic more completely, further improving the accuracy of arsenic content measurement.

[0067] In some embodiments, the predetermined weight can be set to 0.25 g, and the first aqua regia solution of predetermined concentration can be a solution of aqua regia and secondary deionized water mixed in a volume ratio of 1:1, to ensure that the sample can be fully dissolved in the first aqua regia solution after crushing, thereby forming a first aqua regia solution containing the sample with uniform composition.

[0068] In some embodiments, step S22 also includes the following steps: S221: heating the first aqueous regia solution and the second aqueous regia solution at a predetermined temperature for a predetermined time; S222: diluting the solution obtained in S221 to a predetermined capacity and letting it stand for a predetermined time.

[0069] By heating the first aqueous regia solution and the second aqueous regia solution, the solubility of the sample in the first aqueous regia solution is increased, the dissolution of the sample in the first aqueous regia solution is accelerated, and the first aqueous regia solution extracts the sample more completely. The first aqueous regia solution after the sample is extracted is fixed to a constant volume and allowed to stand, which prolongs the dissolution time of the sample in the first aqueous regia solution, so as to obtain a first aqueous regia solution containing the sample with uniform composition and a second aqueous regia solution under the same experimental conditions.

[0070] In some embodiments, the predetermined temperature can be set to 90°C and the predetermined time can be set to 1 hour, which effectively improves the solubility of the sample in the first aqua regia solution and the extraction efficiency of the sample by the first aqua regia solution, making the first aqua regia solution extract the sample more completely.

[0071] In some embodiments, the first aqua regia solution and the second aqua regia solution can be heated by means of water bath heating. By utilizing the characteristic of uniform heat transfer of water bath heating, the temperature difference at various parts of the first aqua regia solution and the second aqua regia solution is eliminated, thereby ensuring that the solubility of the sample is the same at various parts of the first aqua regia solution, and further improving the compositional uniformity of the first aqua regia solution containing the sample.

[0072] In some embodiments, the predetermined volume can be set to 25 mL, and the predetermined time can be set to 5 h, so that the sample can be completely dissolved in the first aqua regia solution, ensuring the uniformity and stability of the composition of the first aqua regia solution containing the sample. At the same time, the impurities insoluble in the first aqua regia solution are completely settled to the bottom of the first aqua regia solution.

[0073] In some embodiments, the S30 step further includes the following steps: S31: Heating the first aqua regia solution to a predetermined temperature and evaporating it to near dryness; S32: Adding a predetermined amount of sub-boiling concentrated nitric acid to the solution in S31, heating it to a predetermined temperature and evaporating it to near dryness; S33: Adding nitric acid with a predetermined concentration and making up the volume to a predetermined volume to obtain a first dilute nitric acid solution; S34: Performing the same treatment on the second aqua regia solution as on the first aqua regia solution to obtain a second dilute nitric acid solution.

[0074] Since the boiling point of the nitric acid-water azeotrope is higher than that of the nitric acid-aqua regia azeotrope, therefore, the first aqua regia solution and the second aqua regia solution are heated to a predetermined temperature and evaporated to near dryness, so that the hydrochloric acid in the first aqua regia solution and the second aqua regia solution is preferentially evaporated, thereby achieving a preliminary removal of the hydrochloric acid in the first aqua regia solution and the second aqua regia solution. Then, sub-boiling concentrated nitric acid is added to the solution containing the sample and the solution not containing the sample respectively, to avoid introducing new impurities during the second evaporation process of the solution containing the sample and the solution not containing the sample, and to achieve a secondary removal of the hydrochloric acid in the solution containing the sample and the solution not containing the sample. By adding nitric acid with a predetermined concentration, the solution containing the sample and the solution not containing the sample evaporated to near dryness are redissolved, and the redissolved solution containing the sample and the solution not containing the sample are made up to a predetermined volume, realizing the conversion of the solution containing the sample and the solution not containing the sample from the aqua regia solution system to the nitrate solution system, and eliminating the interference of hydrochloric acid in the aqua regia solution system on the test accuracy of the inductively coupled plasma mass spectrometer.

[0075] In some embodiments, the predetermined temperature in the S31 step can be set to 130 °C to avoid the volatilization of arsenic in the first aqua regia solution caused by too high a predetermined temperature, and to reduce the accuracy of arsenic content measurement.

[0076] In some embodiments, the predetermined amount in the S32 step can be 1 mL.

[0077] In some embodiments, the nitric acid at a predetermined concentration in step S33 may be a solution obtained by mixing concentrated nitric acid and distilled water at a mass ratio of 1:1.

[0078] In some embodiments, the first aqua regia solution in step S31 may be the supernatant of the predetermined amount of the first aqua regia solution obtained in step S222. By obtaining the supernatant in the first aqua regia solution, the interference of insoluble impurities at the bottom of the first aqua regia solution can be avoided. Exemplarily, the predetermined amount may be 2 mL.

[0079] In some embodiments, after step S32 and before step S33, the following steps are further included: adding sub-boiling nitric acid and evaporating it to dryness at a temperature higher than a predetermined temperature to ensure the effective removal of hydrochloric acid in the solution containing the sample and the solution not containing the sample. Exemplarily, the temperature higher than the predetermined temperature may be set at 150 °C, so as to ensure the complete removal of hydrochloric acid in the solution containing the sample and the solution not containing the sample while quickly evaporating the solution containing the sample and the solution not containing the sample to dryness.

[0080] In some embodiments, step S50 further includes: S51: determining the intensity of arsenic in the second dilute nitric acid solution in step S30 using an inductively coupled plasma mass spectrometer; S52: cleaning the pipeline of the inductively coupled plasma mass spectrometer with 2% nitric acid; S53: determining the intensity of arsenic in the first dilute nitric acid solution in step S30 using an inductively coupled plasma mass spectrometer. Among them, cleaning the pipeline of the inductively coupled plasma mass spectrometer with 2% nitric acid can wash out the residual second dilute nitric acid solution in the pipeline, thereby avoiding the influence of the residual second dilute nitric acid solution on the measurement of the intensity of arsenic in the first dilute nitric acid solution.

[0081] In some embodiments, step S60 further includes: determining the concentration value of the abscissa corresponding to the intensity values of arsenic in the first dilute nitric acid solution and the second dilute nitric acid solution on the ordinate of the relationship curve according to the relationship curve between the concentration and intensity of arsenic in the solution containing arsenic and the intensities in the first dilute nitric acid solution and the second dilute nitric acid solution in step S50. The concentration value of the abscissa is the concentration of arsenic in the first dilute nitric acid solution and the second dilute nitric acid solution.

[0082] The process of measuring the arsenic content in a predetermined environment using the method provided in the first aspect of the present application will be further described below with specific examples.

[0083] Obtain a sample from a predetermined environment, crush the sample to 74 μm, accurately weigh 0.25 g of the crushed sample and place it into a 25-mL stoppered colorimetric tube. Prepare an aqua regia solution by mixing aqua regia and distilled water in a mass ratio of 1:1. Prepare a nitric acid solution by mixing concentrated nitric acid and secondary deionized water in a volume ratio of 1:1. Prepare a mixed standard solution for inductively coupled plasma mass spectrometry with an arsenic concentration of 10 μg / mL. Prepare a standard solution for inductively coupled plasma mass spectrometry with a rhodium concentration of 1000 μg / mL.

[0084] Add 10 mL of the aqua regia solution to the stoppered colorimetric tube, heat the stoppered colorimetric tube in a water bath at 90 °C for 1 h to dissolve the sample in the aqua regia solution. After heating is completed, dilute the aqua regia solution containing the sample to 25 mL and let it stand for 5 h.

[0085] Transfer 2 mL of the supernatant of the aqua regia solution containing the sample to a 15-mL Teflon digestion vessel. Start the hot plate and set the temperature of the hot plate to 130 °C. After the temperature of the hot plate stabilizes at 130 °C, place the Teflon digestion vessel on the hot plate to evaporate the aqua regia solution containing the sample. When the aqua regia solution containing the sample has evaporated to nearly dry, add 1 mL of sub-boiling concentrated nitric acid for a second evaporation. After the solution containing the sample has evaporated to nearly dry, add 1 mL of sub-boiling nitric acid and set the temperature of the hot plate to 150 °C for a third evaporation. When the solution containing the sample has evaporated to nearly dry, add 1 mL of the nitric acid solution to redissolve the solution containing the sample. After redissolution is completed, dilute the solution containing the sample to 10 mL to obtain a 10-mL dilute nitric acid solution containing the sample.

[0086] Transfer different volumes of the mixed standard solution for inductively coupled plasma mass spectrometry with an arsenic concentration of 10 μg / mL, and use 2% nitric acid to serially dilute the standard solutions containing arsenic with different volumes to obtain solutions containing arsenic with arsenic concentrations of 0, 1, 5, 10, 50, and 100 μg / L; transfer the standard solution for inductively coupled plasma mass spectrometry with a rhodium concentration of 1000 μg / mL, and use 2% nitric acid to serially dilute the mixed standard solution for inductively coupled plasma mass spectrometry with a rhodium concentration of 1000 μg / mL to obtain a standard solution containing rhodium with a rhodium concentration of 10 μg / L.

[0087] Set the operating parameters of the inductively coupled plasma mass spectrometer. Among them, the power is set to 1500 w, the scanning mode is set to peak jumping, the nebulizer gas flow rate is set to 1.09 L / min, the dwell time is set to 0.03 s, the auxiliary gas flow rate is set to 0.79 L / min, the integration time is set to 30 s, the cooling gas flow rate is set to 14.0 L / min, and the number of scans is set to 3 times.

[0088] Optimize and adjust the sensitivity, double-charge yield, and oxide yield of an inductively coupled plasma mass spectrometer using tuning solution. Turn on the inductively coupled plasma mass spectrometer. After the instrument stabilizes, measure six standard solutions containing arsenic and one standard solution containing rhodium to determine the intensities of arsenic corresponding to the six standard solutions containing arsenic and the intensity of rhodium corresponding to the standard solution containing rhodium. Monitor the instrument status based on the change in rhodium intensity and determine the final intensities of arsenic in the six standard solutions containing arsenic.

[0089] Fit the intensities of arsenic in the six finally determined standard solutions containing arsenic and their corresponding arsenic concentrations to obtain a relationship curve between the arsenic concentration and arsenic intensity of the standard solutions containing arsenic.

[0090] Measure the nitric acid solution containing the sample using an inductively coupled plasma mass spectrometer to obtain the intensity of arsenic in the nitric acid solution. Based on the intensity of arsenic in the nitric acid solution and the relationship curve between the arsenic concentration and arsenic intensity of the standard solutions containing arsenic, determine the arsenic concentration corresponding to the intensity of arsenic in the nitric acid solution in the relationship curve, which is the arsenic content in the predetermined environment.

[0091] The following uses a specific example to further illustrate the process of measuring the arsenic content in a predetermined environment using the method provided in the second aspect of this application.

[0092] Obtain a sample from the predetermined environment, crush the sample to 74 μm, accurately weigh 0.25 g of the crushed sample and place it in a 25 mL stoppered colorimetric tube. Prepare a 25 mL stoppered colorimetric tube without the sample. Prepare a first aqua regia solution and a second aqua regia solution by mixing aqua regia and secondary deionized water in a volume ratio of 1:1. Prepare a nitric acid solution by mixing concentrated nitric acid and secondary deionized water in a volume ratio of 1:1. Prepare a mixed standard solution for an inductively coupled plasma mass spectrometer with an arsenic concentration of 10 μg / mL. Prepare a mixed standard solution for an inductively coupled plasma mass spectrometer with a rhodium concentration of 1000 μg / mL.

[0093] Add 10 mL of the first aqua regia solution to the stoppered colorimetric tube containing the sample. At the same time, add 10 mL of the second aqua regia solution to the stoppered colorimetric tube without the sample, and heat the stoppered colorimetric tube containing the sample and the stoppered colorimetric tube without the sample in a 90 °C water bath for 1 h to dissolve the sample in the first aqua regia solution. After heating, dilute the first aqua regia solution containing the sample and the second aqua regia solution without the sample to 25 mL and let it stand for 5 h.

[0094] Transfer 2 mL of the supernatant of the first aqua regia solution containing the sample into a 15 mL Teflon digestion vessel, and transfer 2 mL of the supernatant of the second aqua regia solution without the sample into another 15 mL Teflon digestion vessel. Start the hot plate and set the temperature of the hot plate to 130 °C. After the temperature of the hot plate stabilizes at 130 °C, place the two Teflon digestion vessels on the hot plate to evaporate the first aqua regia solution and the second aqua regia solution. When the first aqua regia solution and the second aqua regia solution are almost dry, add 1 mL of sub-boiling concentrated nitric acid to the first aqua regia solution and the second aqua regia solution respectively for the second evaporation. After the solution containing the sample and the solution without the sample are almost dry, add 1 mL of sub-boiling concentrated nitric acid to the solution containing the sample and the solution without the sample respectively, and set the temperature of the hot plate to 150 °C for the third evaporation. After the solution containing the sample and the solution without the sample are almost dry, add 1 mL of nitric acid solution to the solution containing the sample and the solution without the sample respectively to redissolve the solution containing the sample and the solution without the sample. After the redissolution is completed, dilute the solution containing the sample and the solution without the sample to 10 mL respectively to obtain 10 mL of the first dilute nitric acid solution containing the sample and 10 mL of the second dilute nitric acid solution without the sample.

[0095] Transfer different volumes of the mixed standard solution for inductively coupled plasma mass spectrometry with an arsenic concentration of 10 μg / mL, and gradually dilute the standard solutions containing arsenic with different volumes with 2% nitric acid to obtain solutions containing arsenic with arsenic concentrations of 0, 1, 5, 10, 50, and 100 μg / L respectively; transfer the mixed standard solution for inductively coupled plasma mass spectrometry with a rhodium concentration of 1000 μg / mL, and gradually dilute the mixed standard solution for inductively coupled plasma mass spectrometry with a rhodium concentration of 1000 μg / mL with 2% nitric acid to obtain a standard solution containing rhodium with a concentration of 10 μg / L.

[0096] Set the operating parameters of the inductively coupled plasma mass spectrometer, where the power is set to 1500 w, the scanning mode is set to peak jumping, the nebulizer gas flow rate is set to 1.09 L / min, the dwell time is set to 0.03 s, the auxiliary gas flow rate is set to 0.79 L / min, the integration time is set to 30 s, the cooling gas flow rate is set to 14.0 L / min, and the number of scans is set to 3 times.

[0097] Optimize and adjust the sensitivity, double-charge yield, and oxide yield of an inductively coupled plasma mass spectrometer using tuning liquid. Turn on the inductively coupled plasma mass spectrometer. After the instrument stabilizes, measure six standard solutions containing arsenic and one standard solution containing rhodium to determine the intensities of arsenic corresponding to the six standard solutions containing arsenic and the intensity of rhodium corresponding to the standard solution containing rhodium. Monitor the status of the instrument based on the change in rhodium intensity and determine the final intensities of arsenic in the six standard solutions containing arsenic.

[0098] Fit the intensities of arsenic in the six finally determined standard solutions containing arsenic and their corresponding arsenic concentrations to obtain a relationship curve between the arsenic concentration and the intensity of arsenic in the standard solutions containing arsenic.

[0099] Measure a second dilute nitric acid solution without a sample using an inductively coupled plasma mass spectrometer to obtain the intensity of arsenic in the second dilute nitric acid solution. Clean the pipeline in the inductively coupled plasma mass spectrometer with 2% dilute nitric acid. After cleaning, measure the first dilute nitric acid solution using the inductively coupled plasma mass spectrometer to obtain the intensity of arsenic in the first dilute nitric acid solution.

[0100] Based on the intensities of arsenic in the first and second dilute nitric acid solutions and the relationship curve between the arsenic concentration and the intensity of arsenic in the standard solutions containing arsenic, determine the arsenic concentrations corresponding to the intensities of arsenic in the first and second dilute nitric acid solutions in the relationship curve, which are the arsenic concentrations in the first and second dilute nitric acid solutions.

[0101] Determine the first measured value of the arsenic content in the predetermined environment according to the relationship expression between the arsenic concentrations in the first and second dilute nitric acid solutions, the intensities of arsenic in the first and second dilute nitric acid solutions, and the arsenic content in the predetermined environment.

[0102] Repeat the above steps twice to obtain the second measured value and the third measured value of the arsenic content in the predetermined environment. Table 1 shows the measured values, average values, recommended values, and precisions of the arsenic content in the predetermined environment measured using the method provided in the second aspect of the present application.

[0103] Table 1 Measured values, average values, recommended values, and precisions of the arsenic content in the predetermined environment

[0104]

[0105] As can be seen from Table 1, the first measured value, the second measured value, and the third measured value of the arsenic content in the predetermined environment are close and all within the range of the recommended value. Moreover, the precision is 0.5%, further verifying the accuracy and stability of the arsenic content in the predetermined environment measured using the method provided in the second aspect of the present application.

[0106] For the embodiments of the present application, it should also be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0107] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for measuring the arsenic content in a predetermined environment, characterized in that, It includes the following steps: S10: Obtain a sample from the predetermined environment; S20: Process the sample and dissolve it in aqua regia solution; S30: Convert the aqua regia solution in step S20 into a dilute nitric acid solution; S40: Determine the relationship between the arsenic concentration and the intensity of arsenic in the solution containing arsenic measured by inductively coupled plasma mass spectrometry; S50: Use the inductively coupled plasma mass spectrometry to determine the intensity of arsenic in the dilute nitric acid solution in step S30; S60: Determine the arsenic content in the predetermined environment according to the relationship determined in step S40 and the intensity determined in step S50.

2. The method according to claim 1, wherein: In step S20, the following steps are further included: S21: Crush the sample to a predetermined size and weigh a predetermined weight of the sample; S22: Dissolve the sample with aqua regia solution of a predetermined concentration.

3. The method according to claim 1, wherein: In step S22, the following steps are further included: S221: Heat the aqua regia solution at a predetermined temperature for a predetermined time; S222: Make the solution obtained in S221 reach a predetermined volume and let it stand for a predetermined time.

4. The method according to claim 1, wherein: In step S30, the following steps are further included: S31: Heat the aqua regia solution to a predetermined temperature and evaporate it to nearly dry; S32: Add a predetermined amount of sub-boiling concentrated nitric acid to the solution in S31, heat it to a predetermined temperature and evaporate it to nearly dry; S33: Add nitric acid of a predetermined concentration and make it reach a predetermined volume.

5. The method according to claim 4, wherein: Before step S33 and after step S32, the following steps are further included: Add sub-boiling nitric acid and evaporate it to dryness at a temperature higher than the predetermined temperature.

6. A method for measuring the arsenic content in a predetermined environment, characterized in that, It includes the following steps: S10: Obtain a sample from the predetermined environment; S20: Process the sample and dissolve it in the first aqua regia solution, and at the same time obtain the second aqua regia solution that is not used to dissolve the sample, and the second aqua regia solution is the same as the first aqua regia solution; S30: Convert the first aqua regia solution in which the sample is dissolved in step S20 into the first dilute nitric acid solution, perform the same treatment on the second aqua regia solution as on the first aqua regia solution, and obtain the second dilute nitric acid solution; S40: Determine the relationship between the arsenic concentration and the intensity of arsenic in the solution containing arsenic measured by inductively coupled plasma mass spectrometry; S50: Use the inductively coupled plasma mass spectrometry to determine the intensity of arsenic in the first dilute nitric acid solution in step S30 and the intensity of arsenic in the second dilute nitric acid solution; S60: Determine the arsenic concentration in the first dilute nitric acid solution according to the relationship determined in step S40 and the intensity in the first dilute nitric acid solution determined in step S50, Determine the arsenic concentration in the second dilute nitric acid solution according to the relationship determined in step S40 and the intensity of arsenic in the second dilute nitric acid solution determined in step S50; S70: Determine the arsenic content in the predetermined environment according to the arsenic concentration in the first dilute nitric acid solution and the arsenic concentration in the second dilute nitric acid solution.

7. The method according to claim 6, wherein In step S70, the relationship between the arsenic concentration in the first dilute nitric acid solution, the arsenic concentration in the second dilute nitric acid solution, and the arsenic content in the predetermined environment conforms to the following expression: Wherein, C represents the arsenic content in the predetermined environment, with the unit of μg / L; C1 represents the arsenic concentration in the first dilute nitric acid solution, with the unit of μg / L; C0 represents the arsenic concentration in the second dilute nitric acid solution, with the unit of μg / L; V1 represents the volume of the first aqua regia solution obtained by dissolving the sample in step S20, with the unit of mL; V2 represents the volume of the first aqua regia solution in its initial state in step S30, with the unit of mL; V3 represents the volume of the first dilute nitric acid solution in step S30, with the unit of mL; M represents the sample weighing amount, with the unit of g.

8. The method according to claim 1 or 6, wherein In step S40, it further includes: S41: Prepare multiple arsenic-containing solutions, and the arsenic concentration of each solution is known; S42: Measure the arsenic intensity of the solution in step S41 using an inductively coupled plasma mass spectrometer; S43: Determine the relationship between the arsenic concentration and the arsenic intensity of the arsenic-containing solution measured using the inductively coupled plasma mass spectrometer according to the arsenic concentration of the solution in step S41 and the arsenic intensity of the solution in step S42.

9. The method according to claim 8, wherein In step S41, obtain arsenic-containing solutions with different volumes and known concentrations; dilute the arsenic-containing solutions with a nitric acid solution of a predetermined concentration to obtain multiple arsenic-containing solutions, and the arsenic concentration of each solution is known.

10. The method according to claim 9, wherein The predetermined concentration is 2%.

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