System for measuring content of heavy metal components in sewage

Abstract

The invention relates to the technical field of electrochemical sensors, in particular to a sewage heavy metal component content measuring system. The system comprises: a data measurement module for measuring a volt-ampere curve and an initial concentration of heavy metals in a sewage sample; the disturbed analysis module is used for comparing the measured volt-ampere curve with a standard volt-ampere curve and constructing an inhibition factor of each heavy metal so as to screen disturbed heavy metals; the concentration adjusting module is used for determining a comparison sample according to the initial concentration of disturbed heavy metal, comparing the comparison sample with the volt-ampere curve of each sewage sample, and correcting the corresponding initial concentration in combination with the inhibition factor to obtain the final concentration of each heavy metal in each sewage sample; the content measuring module is used for detecting the content of heavy metals in the sewage exceeding the standard based on the final concentration; the accuracy of the content standard exceeding detection result is improved, and the problems of missed report and wrong report caused by inaccurate heavy metal concentration determination due to the fact that organic pollutants hinder the electrochemical reaction of heavy metal ions are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrochemical sensor, in particular to a system for determining the content of heavy metal components in sewage. BACKGROUND

[0002] With the development of industry, heavy metal pollution is one of the causes of global water environmental pollution. As the main carrier and diffusion path of heavy metal pollution, the long-term accumulation of heavy metals in rivers and other water bodies leads to water pollution by heavy metals, which seriously threatens the health and safety of aquatic organisms and humans. Therefore, it is of great significance to quickly and accurately detect the composition of heavy metals in water to protect drinking water safety and ecological environment health.

[0003] Electrochemical sensor technology is one of the commonly used technologies for determining the content of heavy metal components in sewage. This technology is mainly based on the oxidation or reduction reaction of heavy metal ions on the electrode surface to produce electrons and form an electrical signal. The relationship between the electrical signal and the concentration of heavy metals is used to determine the content of heavy metal components. However, actual sewage usually contains a large amount of complex organic pollutants that inhibit the electrochemical reaction of heavy metal ions, resulting in a lower current in the measured voltammetry curve, and thus leading to inaccurate determination of the concentration of heavy metals, i.e. lower than the actual concentration. SUMMARY

[0004] In order to solve the above technical problems, the purpose of the present application is to provide a system for determining the content of heavy metal components in sewage, and the technical solution adopted is as follows: The present application provides a system for determining the content of heavy metal components in sewage, which comprises: A data measurement module for measuring the voltammetry curve and initial concentration of each heavy metal in each sewage sample; A disturbed analysis module for determining the inhibition factor of each heavy metal concentration measurement based on the peak width and waveform difference between the measured voltammetry curve and the standard voltammetry curve to screen the disturbed heavy metals; A concentration adjustment module for determining the comparative sample of each disturbed heavy metal based on the initial concentration of each disturbed heavy metal in all sewage samples; constructing the concentration adjustment coefficient of each disturbed heavy metal in each sewage sample based on the difference between the voltammetry curve of the same disturbed heavy metal in each sewage sample and the comparative sample, combined with the inhibition factor; correcting the initial concentration of each disturbed heavy metal in each sewage sample based on the concentration adjustment coefficient to obtain the final concentration of each heavy metal in each sewage sample; A content determination module for detecting the over-standard content of heavy metals in sewage based on the final concentration.

[0005] In one embodiment, the process of obtaining the inhibition factor is as follows: The voltammetric curves of each heavy metal in the wastewater sample corresponding to its initial maximum concentration are denoted as the first voltammetric curve; the half-width of the standard voltammetric curve of each heavy metal is obtained and denoted as the standard half-width; the difference between the half-width of the first voltammetric curve and the standard half-width is taken as the half-width deviation of each heavy metal. The difference between the voltammetric curves of each heavy metal measured in each wastewater sample and the standard voltammetric curve was calculated using a distance metric algorithm. The inhibition factor is positively correlated with the deviation of the full width at half maximum (FWHM) and the degree of difference, respectively.

[0006] In one embodiment, the expression for the inhibition factor is: In the formula, This represents the inhibitory factor for the nth heavy metal ion. This represents the deviation of the full width at half maximum (FWHM) of the nth heavy metal. This represents the minimum deviation of the full width at half maximum (FWHM) for all heavy metals. , These represent the first current-voltage curve and the corresponding standard current-voltage curve for the nth heavy metal, respectively. Represents curve With curve The degree of difference between them This indicates the preset adjustment factor.

[0007] In one embodiment, the disturbed heavy metal is a heavy metal whose inhibition factor is greater than a preset inhibition factor threshold.

[0008] In one embodiment, the comparison sample is a wastewater sample corresponding to the maximum initial concentration of each disturbed heavy metal.

[0009] In one embodiment, the process of obtaining the concentration adjustment coefficient is as follows: The difference between the voltammetric curves of each wastewater sample and the control sample for each disturbed heavy metal was calculated using a distance metric algorithm and denoted as the first difference. When the half-peak width of each wastewater sample of each disturbed heavy metal is greater than or equal to the half-peak width of the control sample, the concentration adjustment coefficient is positively correlated with the half-peak width of each disturbed heavy metal in each wastewater sample, the first difference degree, and the inhibition factor. When the half-peak width of each wastewater sample of each disturbed heavy metal is smaller than the half-peak width of the control sample, the concentration adjustment coefficient is positively correlated with the half-peak width of each disturbed heavy metal in each wastewater sample and the inhibition factor, and negatively correlated with the first degree of difference.

[0010] In one embodiment, the expression for the concentration adjustment coefficient is: In the formula, Indicates the first The concentration adjustment coefficient of the disturbed heavy metal in the i-th wastewater sample; Indicates the first Inhibitors of various types of disturbed heavy metals; , They represent the first The half-peak width of the disturbed heavy metal in the i-th wastewater sample and its comparison sample; Indicates the first The difference between the voltammetric curve of a disturbed heavy metal in the i-th wastewater sample and the voltammetric curve in the control sample; It is the hyperbolic tangent function.

[0011] In one embodiment, the process for obtaining the final concentration of each heavy metal in each wastewater sample is as follows: The initial concentration of each disturbed heavy metal in each wastewater sample is corrected based on the concentration adjustment coefficient. The corrected concentration of each disturbed heavy metal in each wastewater sample is taken as its final concentration. For the remaining heavy metals, their initial concentration in each wastewater sample is taken as their corresponding final concentration.

[0012] In one embodiment, the correction of the initial concentration of each disturbed heavy metal in each wastewater sample specifically involves: Calculate the sum of the normalized value of the concentration adjustment coefficient of each disturbed heavy metal in each wastewater sample and the natural number 1; multiply the sum by the initial concentration of each disturbed heavy metal in each wastewater sample as the corrected concentration.

[0013] In one embodiment, the detection of excessive heavy metal content in wastewater based on the final concentration specifically includes: If the final concentration of each heavy metal in each wastewater sample is greater than the specified concentration threshold for each heavy metal, then the concentration of each heavy metal in each wastewater sample is determined to exceed the standard; otherwise, the concentration of each heavy metal in each wastewater sample is determined not to exceed the standard.

[0014] This application has the following beneficial effects: The application can identify the heavy metals in the sewage sample that are greatly affected by the inhibition of organic pollutants by measuring the voltammetry curve of the sewage sample, calculating the inhibition factor of the electrochemical reaction of each heavy metal ion by the organic pollutants in the sewage sample through the half-peak width and curve similarity of the voltammetry curve and the standard voltammetry curve, and performing disturbed heavy metal screening through the inhibition factor, and then can adjust the measured concentration accordingly; the concentration adjustment coefficient is constructed by determining the comparison sample of the disturbed heavy metal in all samples, analyzing the voltammetry curve similarity characteristics of each sample and the comparison sample, and combining the inhibition factor, so as to correct the concentration of the disturbed heavy metal in each sample, significantly improve the reliability and consistency of the concentration estimation, and make the adjusted concentration closer to the true value; the concentration after correction is used for content over-standard detection, the accuracy of the content over-standard detection result is improved, false positives or false negatives caused by measurement errors are reduced, and the problem of inaccurate heavy metal concentration determination caused by the hindering of the electrochemical reaction of heavy metal ions by organic pollutants when the electrochemical sensor measures the concentration of heavy metal ions in sewage is solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 The system block diagram of the sewage heavy metal component content determination system provided by an embodiment of the present application; Figure 2 The flowchart of the sewage heavy metal component content determination system; Figure 3 The schematic diagram of the inhibition factor acquisition process. DETAILED DESCRIPTION

[0017] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the sewage heavy metal component content determination system according to the present application, its specific implementation, structure, features and effects are described in detail as follows by combining the drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0019] The sewage heavy metal component content determination system provided by the application will be specifically described below with reference to the drawings.

[0020] Please refer to Figure 1 It shows the sewage heavy metal component content determination system block diagram provided by an embodiment of the application, which comprises: The data measurement module 101 measures the volt-ampere curve and initial concentration of each heavy metal in each sewage sample.

[0021] First, with the help of an automated collection device, several equal sewage samples are collected from different positions of the sewage. Preferably, in the embodiment of the application, the number of sewage samples collected is 10. In other embodiments of the application, the implementer can set the number of sewage samples according to the actual application scenario. Then the concentration of each heavy metal element in each sewage sample is determined using a heavy metal sensor. In the embodiment of the application, the heavy metal elements include lead, mercury, cadmium and chromium. The sensor uses an electrochemical sensor, the stirring speed is set to 300 rpm, and the scanning rate is set to 20 mV / s. The volt-ampere curve corresponding to each type of heavy metal in each sewage sample and the measured concentration value are obtained, and the concentration value is recorded as the initial concentration. It should be noted that the stirring speed and scanning rate during sewage sample detection can be set by the implementer according to the actual situation, and the application does not make specific limitations. The electrochemical sensor measures the volt-ampere curve and metal ion concentration, which is a well-known technology, and the specific process will not be described here.

[0022] The disturbed analysis module 102 determines the inhibition factor of each heavy metal concentration measurement based on the peak width and waveform difference between the measured volt-ampere curve and the standard volt-ampere curve, in order to screen the disturbed heavy metal.

[0023] The standard volt-ampere curve of each heavy metal without organic pollutants is called from the disturbed analysis module for analysis.

[0024] The organic pollutants in sewage do not have an inhibitory effect on the electrochemical reactions of all heavy metal ions. For example, humic acid is prone to complexing with free lead ions, reducing the content of free lead ions, and the complex is prone to being adsorbed on the electrode surface, resulting in uneven heavy metal ion reaction area, making the rising edge and falling edge of the peak in the voltammetry curve more gentle, resulting in a larger peak width. Humic acid has less effect on most other heavy metal ions, and the measured concentration is closer to the actual value. In order to shorten the determination period, heavy metals that are less affected by organic pollutants can be selected to reduce the calculation amount of the concentration of the heavy metal, and only the concentration of the heavy metal deviating from the actual value is corrected and calculated. Since other parameters such as stirring speed and scanning rate remain the same, the peak width is basically irrelevant to the concentration of the heavy metal, and is mainly related to the inhibitory effect of the organic pollutants in the sewage on the heavy metal ions. The heavy metal type that is greatly affected by the inhibitory effect of the organic pollutants can be selected according to the peak width characteristics of the measured voltammetry curves of different heavy metals.

[0025] Specifically, first, a suitable peak width is selected. Because baseline drift occurs at the baseline, the peak width cannot be accurately quantified, so the application obtains the half-peak width of the oxidation peak of the voltammetry curve. Because the greater the concentration of the heavy metal is, the higher the peak current is, and the half-peak width is farther away from the baseline, the peak width state can be more accurately reflected. Therefore, the voltammetry curve corresponding to the maximum initial concentration of each heavy metal in all sewage samples is obtained, which is denoted as the first voltammetry curve, and the half-peak width of the first voltammetry curve is obtained. At the same time, the half-peak width of the standard voltammetry curve of the corresponding heavy metal is obtained, which is denoted as the standard half-peak width. The difference between the measured half-peak width of each heavy metal and the corresponding standard half-peak width is taken as the half-peak width deviation of each heavy metal. The calculation of the half-peak width is a known technology, and the specific process will not be described again. The change in the peak width indicates that the inhibitory effect of the organic pollutants will also change the determined voltammetry curve of the heavy metal, and the similarity with the standard voltammetry curve decreases. Therefore, the difference between the measured voltammetry curve of each heavy metal and the corresponding standard voltammetry curve is calculated, and preferably, the difference degree in the embodiment of the application is the DTW distance between the measured voltammetry curve of each heavy metal and the corresponding standard voltammetry curve. The DTW distance is a known technology, and the specific process will not be described again. In other embodiments of the application, the implementer can also use other distance measurement algorithms to calculate the difference between the voltammetry curves. The greater the difference degree in the embodiment of the application, that is, the greater the DTW distance, the lower the similarity between the voltammetry curves.

[0026] Based on the above analysis, the inhibition factor of the organic pollutants in the sewage on the electrochemical reaction of each heavy metal ion is calculated, which is used to represent the inhibition degree of the organic pollutants on the electrochemical reaction of each heavy metal ion. Preferably, in the embodiment of the application, the expression of the inhibition factor of each heavy metal ion is: In the formula, an inhibition factor representing the concentration measurement of the nth heavy metal, a half-peak width deviation amount of the nth heavy metal, a minimum value of the half-peak width deviation amounts of all heavy metals, 、 a first voltammetry curve and a corresponding standard voltammetry curve of the nth heavy metal, respectively, a difference between the curve and the curve , represents a preset adjustment factor. Wherein, is a very small positive number, which is used to avoid the denominator being zero, and the value range is , preferably, the value of the in the embodiment of the present application is 0.001. In other embodiments of the present application, the implementer can set it according to the actual situation, and the present application does not make specific limitations.

[0027] In other embodiments of the present application, the inhibition factor of each heavy metal ion can be the sum of the normalized value of the half-peak width deviation amount of each heavy metal and the normalized value of the difference.

[0028] The greater the half-peak width deviation amount of the measured voltammetry curve of the heavy metal and the lower the similarity with the standard voltammetry curve, the greater the value, indicating that the electrochemical reaction of the heavy metal ion is greatly affected by the organic pollutants, and the preliminary measured concentration deviates greatly from the actual value.

[0029] all the calculated inhibition factors of the heavy metals are taken as inputs, and the maximum inter-class variance algorithm is used to output an inhibition factor threshold value. If the inhibition factor of each heavy metal is less than or equal to the inhibition factor threshold value, it indicates that the organic pollutants in the sewage have a low degree of inhibition on the electrochemical reaction of the heavy metal, and the preliminary measured heavy metal concentration is closer to the actual value. If the inhibition factor of each heavy metal is greater than the inhibition factor threshold value, it indicates that the organic pollutants in the sewage have a high degree of inhibition on the electrochemical reaction of the heavy metal, resulting in a lower preliminary measured peak current of the electrochemical sensor, and thus a greater deviation between the preliminary measured heavy metal concentration and the actual concentration, which needs to be corrected subsequently, and the heavy metal is taken as a disturbed heavy metal. The maximum inter-class variance algorithm is a known technology, and the specific process is not described again.

[0030] It should be noted that for the setting of the inhibition factor threshold value, the present application only provides a threshold segmentation algorithm, and there are many existing threshold segmentation algorithms, and the implementer can also use other threshold segmentation algorithms to obtain the inhibition factor threshold value, which is not specifically limited by the present application.

[0031] ​The concentration adjustment module 103 determines the comparison samples of each disturbed heavy metal based on the initial concentration of each disturbed heavy metal in all wastewater samples; based on the difference between the voltammetric curves of the same disturbed heavy metal in each wastewater sample and the comparison samples, and in conjunction with the inhibition factor, it constructs the concentration adjustment coefficient of each disturbed heavy metal in each wastewater sample; and corrects the initial concentration of each disturbed heavy metal in each wastewater sample based on the concentration adjustment coefficient to obtain the final concentration of each heavy metal in each wastewater sample.

[0032] Theoretically, if there are no organic pollutants or the concentration of organic pollutants is consistent in each wastewater sample, the half-width of the voltammetric curve of the same heavy metal in each wastewater sample will be basically the same. However, in practice, wastewater samples are collected from different locations, so the concentration of organic pollutants in each sample also varies. The higher the concentration of organic pollutants, the more likely they are to undergo complexation reactions with heavy metal ions, resulting in a more uneven photochemical reaction region of heavy metal ions. This leads to a significant difference in the half-width of the voltammetric curve of the same heavy metal in different wastewater samples. That is, for the same heavy metal, the higher the concentration of organic pollutants in the sample, the larger the half-width of its voltammetric curve and the larger the inhibition factor. Therefore, the inhibition factor in one sample cannot represent all samples.

[0033] Specifically, for any disturbed heavy metal, the wastewater sample with the highest initial concentration among all wastewater samples is selected as the control sample. The half-width at half maximum (WHM) of the voltammetric curve of the control sample is obtained and compared with the WHM of the voltammetric curves of each wastewater sample of the disturbed heavy metal. Combined with the similarity between the corresponding voltammetric curves, the concentration of heavy metal in each sample is accurately corrected. Note that the highest concentration of heavy metal in the control sample does not necessarily mean the highest concentration of organic pollutants. Therefore, the rate of change of the WHM can be positive or negative. The data processing for other heavy metals is the same and will not be elaborated here.

[0034] Based on the above analysis, a concentration adjustment coefficient for each disturbed heavy metal in each wastewater sample is calculated. This coefficient is used to control the adjustment range of the initial heavy metal concentration determination for each disturbed heavy metal in each wastewater sample. Preferably, in this embodiment, the expression for the concentration adjustment coefficient is: In the formula, Indicates the first The concentration adjustment coefficient of the disturbed heavy metal in the i-th wastewater sample; Indicates the first Inhibitors of various types of disturbed heavy metals; , They represent the first The half-peak width of the disturbed heavy metal in the i-th wastewater sample and its comparison sample; Indicates the first The difference between the volt-ampere curve of a disturbed heavy metal in the i-th wastewater sample and the volt-ampere curve in the comparison sample is denoted as the first difference. Preferably, in this embodiment, the DTW distance is used to determine the difference between the volt-ampere curves. The implementer may also use other distance measurement algorithms to obtain the difference between the volt-ampere curves. This application does not impose specific restrictions. It is the hyperbolic tangent function.

[0035] like If the concentration is greater than or equal to 0, then the concentration of organic pollutants in each wastewater sample is greater than or equal to the concentration of organic pollutants in the control sample. Furthermore, the greater the difference in organic pollutant concentration between each wastewater sample and the control sample, the greater the difference in half-width at half-maximum (WWHM) between the two samples and the corresponding difference in their voltammetric curves. Therefore, the degree of upward adjustment of the concentration for each wastewater sample should be greater, resulting in a larger concentration adjustment coefficient. If the value is less than 0, the concentration of organic pollutants in each wastewater sample is less than that in the control sample. The smaller the concentration of organic pollutants in each wastewater sample is compared to that in the control sample, the greater the difference in half-width between the two samples and the greater the difference in the corresponding voltammetric curves. The degree of upward adjustment of the concentration of each wastewater sample should be smaller, and thus the smaller the concentration adjustment coefficient.

[0036] In other embodiments of this application, the expression for the concentration adjustment factor of each disturbed heavy metal in each wastewater sample may also be: .

[0037] To shorten the determination cycle of heavy metal content, only the initial concentrations of heavy metal species with inhibition factors greater than the threshold are corrected. The initial concentrations of heavy metals with smaller inhibition factors are very close to the actual values, thus reducing the need for correction calculations. Specifically, the initial concentration of each disturbed heavy metal in each wastewater sample is obtained, and corrected using the corresponding adjustment coefficient. Preferably, in this embodiment, the expression for the corrected heavy metal concentration is: In the formula, Indicates the first The corrected concentration of the disturbed heavy metal in the i-th wastewater sample. Indicates the first The initial concentration of the disturbed heavy metals measured in the i-th wastewater sample. This represents the hyperbolic tangent function, which normalizes the concentration adjustment coefficient to prevent excessively large concentration adjustments that significantly exceed the actual concentration. Specifically, for... Regarding normalization, this application only provides one normalization method. Many existing normalization methods exist, and implementers may also use other normalization algorithms. Normalization is performed, which is not specifically limited in the present application.

[0038] The content determination module 104 detects whether the heavy metal content in the sewage exceeds the standard based on the final concentration.

[0039] The corrected concentration of each disturbed heavy metal in each sewage sample is taken as the final concentration of the heavy metal. For the remaining heavy metals, the initial concentration of each heavy metal in each sewage sample is taken as the corresponding final concentration. If the final concentration of each heavy metal in each sewage sample is greater than the national concentration threshold of each heavy metal, it is determined that the concentration of the heavy metal in the sewage sample exceeds the standard, and an alarm mechanism is triggered to display the type of heavy metal and the sewage sample number so that the staff can develop a reasonable sewage treatment plan. Otherwise, it is determined that the concentration of the heavy metal in the sewage sample does not exceed the standard.

[0040] The process diagram of the sewage heavy metal component content determination system is shown in Figure 2 The acquisition process of the inhibition factor is shown in Figure 3

[0041] In summary, the embodiments of the present application measure the voltammetry curve of the sewage sample, calculate the inhibition factor of the electrochemical reaction of each heavy metal ion in the sewage sample by the half-peak width and curve similarity of the standard voltammetry curve, screen the disturbed heavy metal by the inhibition factor, can identify the heavy metal in the sewage sample that is more affected by the inhibition of the organic pollutant, and then can adjust the measured concentration accordingly; by determining the comparison sample of the disturbed heavy metal in all samples, analyzing the voltammetry curve similarity characteristics of each sample and the comparison sample, and combining the inhibition factor, a concentration adjustment coefficient is constructed to correct the concentration of the disturbed heavy metal in each sample, significantly improving the reliability and consistency of the concentration estimation, and making the adjusted concentration closer to the true value; the content exceeds the standard detection is performed by the corrected concentration, improving the accuracy of the content exceeds the standard detection result, reducing the false positives or false negatives caused by measurement errors, and solving the problem of inaccurate heavy metal concentration measurement caused by the hindering of the electrochemical reaction of heavy metal ions by organic pollutants when the electrochemical sensor measures the heavy metal ion concentration in the sewage.

[0042] It should be noted that the above-mentioned order of the embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multi-task processing and parallel processing are also possible or can be advantageous.

[0043] Each embodiment in the present application is described in a progressive manner, and the same or similar parts of each embodiment can be referred to each other. Each embodiment focuses on the differences from other embodiments. ​

[0044] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; the technical solutions described in the foregoing embodiments are modified, or some technical features are replaced equivalently, and the essence of the corresponding technical solutions does not deviate from the scope of the technical solutions of the embodiments of the present application, which should be included in the protection scope of the present application.

Claims

1. A system for determining the content of heavy metal components in wastewater, characterized in that, The system includes: Data measurement module: measures the voltammetric curve and initial concentration of each heavy metal in each wastewater sample; Disturbance Analysis Module: Based on the peak width and waveform difference between the measured voltammetric curve and the standard voltammetric curve, the inhibition factor for each heavy metal concentration measurement is determined to screen for disturbed heavy metals; Concentration Adjustment Module: Based on the initial concentration of each disturbed heavy metal in all wastewater samples, a comparison sample for each disturbed heavy metal is determined; based on the difference between the voltammetric curves of the same disturbed heavy metal in each wastewater sample and the comparison sample, and combined with the inhibition factor, a concentration adjustment coefficient for each disturbed heavy metal in each wastewater sample is constructed; based on the concentration adjustment coefficient, the initial concentration of each disturbed heavy metal in each wastewater sample is corrected to obtain the final concentration of each heavy metal in each wastewater sample; Content determination module: Detects excessive levels of heavy metals in wastewater based on the final concentration.

2. The wastewater heavy metal component content determination system according to claim 1, characterized in that, The process of obtaining the inhibitory factor is as follows: The voltammetric curves of each heavy metal in the wastewater sample corresponding to its initial maximum concentration are denoted as the first voltammetric curve; the half-width of the standard voltammetric curve of each heavy metal is obtained and denoted as the standard half-width; the difference between the half-width of the first voltammetric curve and the standard half-width is taken as the half-width deviation of each heavy metal. The difference between the voltammetric curves of each heavy metal measured in each wastewater sample and the standard voltammetric curve was calculated using a distance metric algorithm. The inhibition factor is positively correlated with the deviation of the full width at half maximum (FWHM) and the degree of difference, respectively.

3. The wastewater heavy metal component content determination system according to claim 2, characterized in that, The expression for the inhibition factor is: In the formula, This represents the inhibition factor for measuring the concentration of the nth heavy metal. This represents the deviation of the full width at half maximum (FWHM) of the nth heavy metal. This represents the minimum deviation of the full width at half maximum (FWHM) for all heavy metals. , These represent the first current-voltage curve and the corresponding standard current-voltage curve for the nth heavy metal, respectively. Represents curve With curve The degree of difference between them This indicates the preset adjustment factor.

4. The wastewater heavy metal component content determination system according to claim 1, characterized in that, The disturbed heavy metal is a heavy metal whose inhibition factor is greater than a preset inhibition factor threshold.

5. The wastewater heavy metal component content determination system according to claim 1, characterized in that, The comparison samples are wastewater samples corresponding to the maximum initial concentration of each disturbed heavy metal.

6. The wastewater heavy metal component content determination system according to claim 2, characterized in that, The process for obtaining the concentration adjustment coefficient is as follows: The difference between the voltammetric curves of each wastewater sample and the control sample for each disturbed heavy metal was calculated using a distance metric algorithm and denoted as the first difference. When the half-peak width of each wastewater sample of each disturbed heavy metal is greater than or equal to the half-peak width of the control sample, the concentration adjustment coefficient is positively correlated with the half-peak width of each disturbed heavy metal in each wastewater sample, the first difference degree, and the inhibition factor. When the half-peak width of each wastewater sample of each disturbed heavy metal is smaller than the half-peak width of the control sample, the concentration adjustment coefficient is positively correlated with the half-peak width of each disturbed heavy metal in each wastewater sample and the inhibition factor, and negatively correlated with the first degree of difference.

7. The wastewater heavy metal component content determination system according to claim 6, characterized in that, The expression for the concentration adjustment coefficient is: In the formula, Indicates the first The concentration adjustment coefficient of the disturbed heavy metal in the i-th wastewater sample; Indicates the first Inhibitors of various types of disturbed heavy metals; , They represent the first The half-peak width of the disturbed heavy metal in the i-th wastewater sample and its comparison sample; Indicates the first The difference between the voltammetric curve of a disturbed heavy metal in the i-th wastewater sample and the voltammetric curve in the control sample; It is the hyperbolic tangent function.

8. The wastewater heavy metal component content determination system according to claim 1, characterized in that, The process for obtaining the final concentration of each heavy metal in each wastewater sample is as follows: The initial concentration of each disturbed heavy metal in each wastewater sample is corrected based on the concentration adjustment coefficient. The corrected concentration of each disturbed heavy metal in each wastewater sample is taken as its final concentration. For the remaining heavy metals, their initial concentration in each wastewater sample is taken as their corresponding final concentration.

9. The wastewater heavy metal component content determination system according to claim 8, characterized in that, The correction of the initial concentration of each disturbed heavy metal in each wastewater sample is specifically as follows: Calculate the sum of the normalized value of the concentration adjustment coefficient of each disturbed heavy metal in each wastewater sample and the natural number 1; multiply the sum by the initial concentration of each disturbed heavy metal in each wastewater sample as the corrected concentration.

10. The wastewater heavy metal component content determination system according to claim 1, characterized in that, The detection of excessive heavy metal content in wastewater based on the final concentration is specifically as follows: If the final concentration of each heavy metal in each wastewater sample is greater than the specified concentration threshold for each heavy metal, then the concentration of each heavy metal in each wastewater sample is determined to exceed the standard; otherwise, the concentration of each heavy metal in each wastewater sample is determined not to exceed the standard.

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