In-situ online quantitative analysis system based on inductively coupled plasma spectrometer

Abstract

The utility model discloses an in-situ on-line quantitative analysis system based on an inductively coupled plasma spectrometer, relates to the field of instrument analysis-sample component analysis and test, and aims to solve the problem that in-situ on-line quantitative analysis cannot be realized by a test mode of a conventional inductively coupled plasma emission spectrometer. The device comprises a sample introduction unit, an atomization analysis unit and a peristaltic pump assembly, the sample outlet end of the sample introduction unit communicates with the sample introduction end of the atomization analysis unit through the peristaltic pump assembly, and the peristaltic pump assembly comprises an external peristaltic pump unit and an internal peristaltic pump unit; the sample outlet end of the sample introduction unit is communicated with the sample introduction end of the external peristaltic pump unit, the sample outlet end of the external peristaltic pump unit is communicated with the sample introduction end of the internal peristaltic pump unit, and the sample outlet end of the internal peristaltic pump unit is communicated with the sample introduction end of the atomization analysis unit. The analysis system is mainly used for carrying out online quantitative analysis on sample substances.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of instrument analysis - sample component analysis test, concretely relates to a kind of in-situ online quantitative analysis system based on inductively coupled plasma spectrometer. BACKGROUND

[0002] With the research of chemistry, materials science gradually develops in depth, researchers urgently need to study the mechanism of materials, structural changes and factors affecting its performance more deeply. However, the traditional ex-situ research method has been unable to meet the needs of current scientific research. In-situ characterization technology developed in the past three decades can use different instruments to analyze specific reaction processes online. As a technology that continuously and synchronously analyzes materials through a specific device, it ultimately obtains a series of results with time or other related conditions as parameters, and realizes the analysis of material reaction process changes. It has the following advantages: 1. Real-time and high accuracy: in-situ testing can monitor the internal microstructure and performance changes of materials in real time, reducing the influence of human factors and improving the accuracy of test results; 2. Strong controllability: the sensor position of in-situ testing can be realized through a material preparation method with high design accuracy and strong controllability, so that the test position and test conditions can be accurately controlled, making the test results more reliable; 3. Rich information: in-situ testing integrates multiple analysis methods to obtain multiple information clues simultaneously, providing a more comprehensive and in-depth understanding of the microstructure and performance of materials. The commonly used in-situ characterization methods include in-situ infrared, in-situ Raman, in-situ mechanics, in-situ X-ray diffraction, in-situ scanning, and in-situ transmission. As a comprehensive testing method, in-situ testing will have more extensive applications in scientific research in the future, especially in the development and preparation of new materials. Through in-situ testing, the structure and performance of materials can be more precisely controlled.

[0003] Inductively coupled plasma emission spectrometer (ICP-OES) has high sensitivity, wide linear range and good selectivity, and can quickly and accurately analyze multiple elements. It is not only an indispensable analysis method for chemical, metallurgical, mechanical, geological and other departments, but also increasingly demonstrates its superiority in the analysis of organic and biochemical samples, as well as current concerns such as environmental testing and food safety monitoring. It has become the most superior analysis performance and practical value of laboratory detection means. The conventional ICP-OES test is a sampling test mode, i.e. offline test mode, which cannot realize in-situ online quantitative analysis. The sampling test mode of ICP-OES not only affects the test results during the sampling process, but also can only test one fixed state before and after the reaction, which cannot realize dynamic monitoring during the reaction process.

[0004] Therefore, in order to overcome the above-mentioned disadvantages, it is very practical to develop an in-situ online quantitative analysis system based on an inductively coupled plasma spectrometer. Utility model content

[0005] The utility model discloses in order to solve the problem that the test mode of conventional inductively coupled plasma emission spectrometer can not realize in-situ online quantitative analysis, and further provides an in-situ online quantitative analysis system based on an inductively coupled plasma spectrometer;

[0006] An in-situ online quantitative analysis system based on an inductively coupled plasma spectrometer, quantitative analysis system includes sample sample unit, atomization analysis unit and peristaltic pump assembly, and the sample outlet end of sample sample unit is communicated with the sample inlet end of atomization analysis unit through peristaltic pump assembly, and the peristaltic pump assembly includes external peristaltic pump unit and internal peristaltic pump unit, the sample outlet end of sample sample unit is communicated with the sample inlet end of external peristaltic pump unit, the sample outlet end of external peristaltic pump unit is communicated with the sample inlet end of internal peristaltic pump unit, and the sample outlet end of internal peristaltic pump unit is communicated with the sample inlet end of atomization analysis unit;

[0007] Further, the sample sample unit includes a reaction cell and a sample outlet pipe, the sample inlet end of the sample outlet pipe is inserted into the reaction cell and is communicated with the reaction cell, and the sample outlet end of the sample outlet pipe is communicated with the sample inlet end of the external peristaltic pump unit.

[0008] Further, the external peristaltic pump unit includes a filter, a first peristaltic pump, a first sample input pipe, a first mixer, a second sample input pipe, a second peristaltic pump, a second mixer, a first dilution pipe group and a second dilution pipe group, the sample outlet end of the sample outlet pipe is communicated with the sample inlet end of the filter, the sample outlet end of the filter is communicated with the sample inlet end of the first sample input pipe, the sample outlet end of the first sample input pipe is communicated with the sample inlet end of the first mixer through the first peristaltic pump, the liquid inlet end of the first dilution pipe group is inserted into an external dilution cell and is communicated with the external dilution cell, the liquid outlet end of the first dilution pipe group is communicated with the liquid inlet end of the first mixer through the first peristaltic pump, the sample inlet end of the second sample input pipe is communicated with the sample outlet end of the first mixer, the sample outlet end of the second sample input pipe is communicated with the sample inlet end of the second mixer through the second peristaltic pump, the sample outlet end of the second mixer is communicated with the sample inlet end of the internal peristaltic pump unit, the liquid inlet end of the second dilution pipe group is inserted into the external dilution cell and is communicated with the external dilution cell, and the liquid outlet end of the second dilution pipe group is communicated with the liquid inlet end of the second mixer through the second peristaltic pump.

[0009] Further, the filter membrane arranged in the filter is a filter membrane with a pore size of 0.45 um.

[0010] Further, the first dilution pipe group comprises N first dilution pipes, N is a positive integer, the liquid inlet end of each first dilution pipe is inserted into the external dilution pool and arranged in communication with the external dilution pool, the liquid outlet end of each first dilution pipe is arranged in communication with the liquid inlet end of the first mixer through the first peristaltic pump, and a first flow limiting valve is connected in series on the liquid outlet end of the first dilution pipe.

[0011] Further, the second dilution pipe group comprises Z second dilution pipes, Z is a positive integer, the liquid inlet end of each second dilution pipe is inserted into the external dilution pool and arranged in communication with the external dilution pool, the liquid outlet end of each second dilution pipe is arranged in communication with the liquid inlet end of the second mixer through the second peristaltic pump, and a second flow limiting valve is connected in series on the liquid outlet end of the second dilution pipe.

[0012] Further, the internal peristaltic pump unit comprises a third sample input pipe, a third peristaltic pump, a third mixer, a sample discharge pipe and a third dilution pipe group, the sample inlet end of the third sample input pipe is arranged in communication with the sample outlet end of the second mixer, the sample outlet end of the third sample input pipe is arranged in communication with the sample inlet end of the third mixer through the third peristaltic pump, the sample outlet end of the third mixer is arranged in communication with the sample inlet end of the sample discharge pipe, the sample outlet end of the sample discharge pipe is arranged in communication with the sample inlet end of the atomization analysis unit, the liquid inlet end of the third dilution pipe is inserted into the external dilution pool and arranged in communication with the external dilution pool, and the liquid outlet end of the third dilution pipe is arranged in communication with the liquid inlet end of the third mixer through the third peristaltic pump.

[0013] Further, the third dilution pipe group comprises Q third dilution pipes, Q is a positive integer, the liquid inlet end of each third dilution pipe is inserted into the external dilution pool and arranged in communication with the external dilution pool, the liquid outlet end of each third dilution pipe is arranged in communication with the liquid inlet end of the third mixer through the third peristaltic pump, and a third flow limiting valve is connected in series on the liquid outlet end of the third dilution pipe.

[0014] Further, the value range of N is 1-3, the value range of Z is 1-3, and the value range of Q is 1-3.

[0015] Further, the atomization analysis unit comprises an atomizer, a plasma tube and an analysis machine, the sample outlet end of the sample discharge pipe is arranged in communication with the sample inlet end of the atomizer, the waste liquid discharge end of the atomizer is arranged in communication with a waste liquid tank, the gas output end of the atomizer is arranged in communication with the gas input end of the plasma tube, and the detection end of the analysis machine is arranged in correspondence with the plasma tube.

[0016] The beneficial effects of the present application relative to the prior art are:

[0017] The application provides an in-situ online quantitative analysis system based on an inductively coupled plasma spectrometer. The main content is that two external series 4-channel micro peristaltic pumps are used in combination with an existing 4-channel micro peristaltic pump of an ICP-OES to form a 3-pump 12-channel multi-pump system (each micro peristaltic pump has one main channel and the rest are dilution channels). By adjusting the number of sampling channels and the pump speed, a maximum 64-fold online real-time gradient dilution effect can be realized to meet the sampling requirements of the ICP-OES. In addition, since the sampling requirements of the ICP-OES are clear aqueous solutions and there cannot be any suspended matter or precipitate, a 0.45-um filter device is added to the front end of the multi-pump system. The solution in the reaction cell to be tested first passes through the front 0.45-um filter device and then enters the multi-pump system. In the first step, the multi-pump system is closed, the solution in the reaction cell to be tested is directly sampled into the ICP-OES for testing, and the concentration range of the element to be tested is measured. In the second step, according to the measured concentration range of the element, the number of channels and the pump speed of the sampling end of the multi-pump system are adjusted to realize online real-time gradient dilution of the solution in the reaction cell to be tested (a maximum 64-fold gradient dilution is realized by combining nine dilution channels), to meet the sampling requirements, and to realize in-situ online quantitative analysis of elements.

[0018] In addition, the instrument operating parameters include the atomizer efficiency, the peristaltic pump speed, the working gas flow rate and the like, which need to be optimized and adjusted according to the working state of the multi-pump system to meet the sampling state after the multi-pump system is started, and the linearity of the standard solution, the standard addition recovery rate and the measurement of the quality control sample are used to ensure the integrity and accuracy of the test system. In the field of high-selectivity monovalent cation exchange membranes, the ion concentration is usually measured by time sampling to evaluate the performance of the cation exchange membrane, and data is provided for design optimization. However, this method has the disadvantages of sampling deviation and long test period. The in-situ online test of element concentration greatly improves the test efficiency and ensures the real-time and accuracy of the test data. In the field of recycling and reuse of waste lithium ion batteries, the ion content change is usually tested by sampling after multiple cycles of charging and discharging to evaluate the battery performance. The in-situ online test of element concentration can realize real-time and accurate monitoring of ion concentration change during battery cycling, and obtain fine test data that cannot be obtained by sampling test, thereby providing technical support for the development and application of new technologies. Similarly, in the field of electrochemistry, the in-situ online test of element concentration can realize real-time observation of the process, structure and form of electrochemical reactions, and obtain information such as reaction intermediates, which is helpful for researchers to analyze the mechanism of electrochemical reactions. Therefore, the in-situ online test system based on the inductively coupled plasma spectrometer will become a test method with high technical content and wide application field. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 The connection schematic diagram of the in-situ online quantitative analysis system based on the inductively coupled plasma spectrometer according to the application;

[0020] Fig. 2 The composition schematic diagram of the in-situ online quantitative analysis system based on the inductively coupled plasma spectrometer according to the application;

[0021] In the figure, 100 is a sample feeding unit, 200 is an external peristaltic pump unit, 300 is an internal peristaltic pump unit, 400 is an atomization analysis unit, 1 is a reaction cell, 2 is a sample leading-out pipe, 3 is a filter, 4 is a first peristaltic pump, 5 is a first sample input pipe, 6 is a first dilution pipeline, 7 is a first mixer, 8 is a second sample input pipe, 9 is a second peristaltic pump, 10 is a second dilution pipeline, 11 is a second mixer, 12 is a third sample input pipe, 13 is a third dilution pipeline, 14 is a third peristaltic pump, 15 is a third mixer, 16 is a sample discharge pipe, 17 is an atomizer, 18 is a plasma tube, and 19 is an analysis machine. DETAILED DESCRIPTION

[0022] DETAILED DESCRIPTION Figs. 1-2 In this embodiment, an in-situ online quantitative analysis system based on an inductively coupled plasma spectrometer is provided. The quantitative analysis system comprises a sample feeding unit 100, an atomization analysis unit 400, and a peristaltic pump assembly. The sample outlet end of the sample feeding unit 100 is in communication with the sample inlet end of the atomization analysis unit 400 through the peristaltic pump assembly. The peristaltic pump assembly comprises an external peristaltic pump unit 200 and an internal peristaltic pump unit 300. The sample outlet end of the sample feeding unit 100 is in communication with the sample inlet end of the external peristaltic pump unit 200. The sample outlet end of the external peristaltic pump unit 200 is in communication with the sample inlet end of the internal peristaltic pump unit 300. The sample outlet end of the internal peristaltic pump unit 300 is in communication with the sample inlet end of the atomization analysis unit 400.

[0023] The in-situ online quantitative analysis system based on the inductively coupled plasma spectrometer provided in this embodiment increases the external peristaltic pump unit 200 compared with the conventional inductively coupled plasma spectrometer analysis system. The external peristaltic pump unit 200 mainly functions to realize online real-time dilution. By increasing the number of peristaltic pumps and adding the number of dilution pipelines for the sample, and by adjusting the working states of the multiple dilution pipelines, the dilution multiple of the sample can be adjusted.

[0024] DETAILED DESCRIPTION Figs. 1-2The difference between the embodiment and the first specific embodiment is that the sample injection unit 100 comprises the reaction cell 1 and the sample outlet pipe 2, the sample injection end of the sample outlet pipe 2 is inserted into the reaction cell 1 and is in communication with the reaction cell 1, and the sample outlet end of the sample outlet pipe 2 is in communication with the sample injection end of the external peristaltic pump unit 200. The other components and connection modes are the same as those of the first specific embodiment.

[0025] The third specific embodiment is combined with Figs. 1-2 The difference between the embodiment and the second specific embodiment is that the external peristaltic pump unit 200 comprises the filter 3, the first peristaltic pump 4, the first sample input pipe 5, the first mixer 7, the second sample input pipe 8, the second peristaltic pump 9, the second mixer 11, the first dilution pipe group and the second dilution pipe group, the sample outlet end of the sample outlet pipe 2 is in communication with the sample injection end of the filter 3, the sample outlet end of the filter 3 is in communication with the sample injection end of the first sample input pipe 5, the sample outlet end of the first sample input pipe 5 is in communication with the sample injection end of the first mixer 7 through the first peristaltic pump 4, the liquid inlet end of the first dilution pipe group is inserted into the external dilution cell and is in communication with the external dilution cell, the liquid outlet end of the first dilution pipe group is in communication with the liquid inlet end of the first mixer 7 through the first peristaltic pump 4, the sample injection end of the second sample input pipe 8 is in communication with the sample outlet end of the first mixer 7, the sample outlet end of the second sample input pipe 8 is in communication with the sample injection end of the second mixer 11 through the second peristaltic pump 9, the sample outlet end of the second mixer 11 is in communication with the sample injection end of the internal peristaltic pump unit 300, the liquid inlet end of the second dilution pipe group is inserted into the external dilution cell and is in communication with the external dilution cell, and the liquid outlet end of the second dilution pipe group is in communication with the liquid inlet end of the second mixer 11 through the second peristaltic pump 9. The other components and connection modes are the same as those of the second specific embodiment.

[0026] The fourth specific embodiment is combined with Figs. 1-2 The difference between the embodiment and the third specific embodiment is that the filter membrane arranged in the filter 3 is a filter membrane with a pore size of 0.45 um. The other components and connection modes are the same as those of the third specific embodiment.

[0027] The fifth specific embodiment is combined with Figs. 1-2 The difference between the embodiment and the fourth specific embodiment is that the first dilution pipe group comprises N first dilution pipes 6, N is a positive integer, the liquid inlet end of each first dilution pipe 6 is inserted into the external dilution cell and is in communication with the external dilution cell, the liquid outlet end of each first dilution pipe 6 is in communication with the liquid inlet end of the first mixer 7 through the first peristaltic pump 4, and a first flow limiting valve is connected in series on the liquid outlet end of the first dilution pipe 6. The other components and connection modes are the same as those of the fourth specific embodiment.

[0028] The sixth specific embodiment is combined withFigs. 1-2 The embodiment is described, which is different from the fifth embodiment in that the second dilution pipeline group comprises Z second dilution pipelines 10, Z being a positive integer, the liquid inlet end of each second dilution pipeline 10 is inserted into and in communication with the external dilution pool, the liquid outlet end of each second dilution pipeline 10 is in communication with the liquid inlet end of the second mixer 11 through the second peristaltic pump 9, and a second flow limiting valve is connected in series to the liquid outlet end of the second dilution pipeline 10. The other components and connection modes are the same as those of the fifth embodiment.

[0029] In combination with the third to sixth embodiments, the first peristaltic pump 4 and the second peristaltic pump 9 used in the external peristaltic pump unit 200 are both 4-channel micro peristaltic pumps, one main channel for sample injection is arranged on the 4-channel micro peristaltic pump, and the other three channels are all dilution channels. In order to ensure the controllability of the dilution multiple, the pipe diameter of the first dilution pipeline 6 and the pipe diameter of the second dilution pipeline 10 are the same as the pipe diameter of the first sample input pipeline 5 and the pipe diameter of the second sample input pipeline 8, so as to ensure that the volume of the sample and the dilution liquid in each pipeline per unit time is the same. Through the cooperation of the external peristaltic pump unit 200 and the internal peristaltic pump unit 300, a 3-pump 12-channel multi-pump system is formed, and a maximum 64-fold online real-time gradient dilution effect can be realized by adjusting the number of sample injection channels and the pump speed, which meets the ICP-OES sample injection requirements. In addition, since the ICP-OES sample injection requirement is a clear aqueous solution, there cannot be suspended matter or precipitate. Considering the complexity of the in-situ test sample solution, a 0.45-μm filter device is added at the front end of the multi-pump system. The solution to be tested in the reaction pool is first filtered through the front 0.45-μm filter device, and then enters the multi-pump system. In the first step, the multi-pump system is closed, and the solution to be tested in the reaction pool is directly injected into the ICP-OES for testing to measure the concentration range of the element to be tested. In the second step, according to the measured element concentration range, the number of channels and the pump speed of the sample injection end of the multi-pump system are adjusted to realize online real-time gradient dilution of the solution to be tested in the reaction pool, meet the sample injection requirements, and thus realize in-situ online element quantitative analysis.

[0030] The seventh embodiment is described in combination with the above embodiments. Figs. 1-2This embodiment differs from Specific Embodiment Six in that the internal peristaltic pump unit 300 includes a third sample input pipe 12, a third peristaltic pump 14, a third mixer 15, a sample discharge pipe 16, and a third dilution pipeline assembly. The inlet end of the third sample input pipe 12 is connected to the outlet end of the second mixer 11. The outlet end of the third sample input pipe 12 is connected to the inlet end of the third mixer 15 via the third peristaltic pump 14. The outlet end of the third mixer 15 is connected to the inlet end of the sample discharge pipe 16. The outlet end of the sample discharge pipe 16 is connected to the inlet end of the nebulization analysis unit 400. The liquid inlet end of the third dilution pipeline is inserted into and connected to the external dilution tank. The liquid outlet end of the third dilution pipeline is connected to the inlet end of the third mixer 15 via the third peristaltic pump 14. Other components and connections are the same as in Specific Embodiment Six.

[0031] Specific implementation method eight: Combination Figs. 1-2 This embodiment differs from specific embodiment seven in that the third dilution pipeline group includes Q third dilution pipelines 13, where Q is a positive integer. The inlet end of each third dilution pipeline 13 is inserted into and connected to the external dilution tank. The outlet end of each third dilution pipeline 13 is connected to the inlet end of the third mixer 15 via a third peristaltic pump 14. A third flow limiting valve is connected in series at the outlet end of each third dilution pipeline 13. Other components and connections are the same as in specific embodiment seven.

[0032] In conjunction with Specific Embodiments Seven and Eight, the difference between the internal peristaltic pump unit 300 and the external peristaltic pump unit 200 is that the internal peristaltic pump unit 300 is a single peristaltic pump unit and does not have a filter. The third peristaltic pump 14 is also a 4-channel micro peristaltic pump. The diameter of the third dilution pipe 13 is the same as the diameter of the first dilution pipe 6 and the diameter of the third sample input pipe 12. The internal peristaltic pump unit 300 is used to cooperate with the external peristaltic pump unit 200 to realize the sample injection work and to further dilute the sample or the already diluted sample according to the needs of in-situ online quantitative analysis.

[0033] Specific Implementation Method Nine: Combining Figs. 1-2 This embodiment differs from Specific Embodiment Eight in that the values ​​of N, Z, and Q all range from 1 to 3. The other components and connections are the same as in Specific Embodiment Eight.

[0034] In the embodiment, the number of N, Z and Q can be consistent or inconsistent, and the specific number is determined by the inventor according to the dilution multiple of the sample to be analyzed, and it is worth noting that the flow limiting valve is arranged on the liquid outlet end of each dilution pipeline in the application, the function of the flow limiting valve is to determine whether the corresponding dilution pipeline is a passageway or a circuit, and at the same time, the flow limiting valve can also avoid the sample from flowing into the external dilution tank along the non-working dilution pipeline, causing the loss of the sample.

[0035] Specific embodiment ten: combination Figs. 1-2 Figs. 1-2 In the embodiment, the difference between the embodiment and the specific embodiment nine is that the atomization analysis unit 400 includes an atomizer 17, a plasma torch 18 and an analysis machine 19, the sample outlet end of the sample discharge pipe 16 is arranged in communication with the sample inlet end of the atomizer 17, the waste liquid discharge end of the atomizer 17 is arranged in communication with the waste liquid tank, the gas output end of the atomizer 17 is arranged in communication with the gas input end of the plasma torch 18, and the detection end of the analysis machine 19 is arranged in correspondence with the plasma torch 18. The other components and connection modes are the same as those of the specific embodiment nine.

[0036] In the embodiment, the atomization analysis unit 400 is mainly used for atomizing the sample solution, screening out the liquid drops that can be analyzed and detected, forming a plasma flame, evaporating the atomized sample for analysis and detection, and identifying elements and outputting test results.

[0037] The above-mentioned preferred embodiments of the utility model have been disclosed, however, the utility model is not limited to the above-mentioned embodiments, any skilled person in the art can make some changes or modifications to the above-mentioned disclosed structure and technical content without departing from the technical scheme of the utility model to obtain equivalent embodiments, but any simple modification, equivalent change and modification of the above-mentioned embodiments without departing from the technical scheme of the utility model and according to the technical essence of the utility model are still within the scope of the technical scheme of the utility model.

[0038] Working principle

[0039] The application is used firstly to assemble various components according to the connection relationship described in the first embodiment to the tenth embodiment, the first step is to close the flow limiting valve on each dilution pipeline, to ensure that the sample is discharged from the reaction cell 1, and then introduced into the plasma torch 18 after being atomized through the sample leading-out pipeline 2, the filter 3, the first sample input pipeline 5, the second sample input pipeline 8, the third sample input pipeline 12, the sample discharge pipeline 16 and the atomizer 17, and the concentration range of the element to be measured in the sample is measured through the analyzer 19; the second step is to open the flow limiting valve at the end of the corresponding dilution pipeline according to the measured element concentration range and the dilution multiple required for the sample in the subsequent quantitative analysis, and to adjust the pump speed of each peristaltic pump, so as to realize the online real-time gradient dilution of the solution in the reaction cell to be measured (combined with three groups of dilution pipelines to realize the maximum gradient dilution of 64 times), to meet the sampling requirements, and to realize the in-situ online quantitative analysis of elements.

Claims

1. An in-situ on-line quantitative analysis system based on an inductively coupled plasma optical spectrometer, the quantitative analysis system comprising a sample feeding unit (100), an atomization analysis unit (400) and a peristaltic pump assembly, an outlet end of the sample feeding unit (100) being in communication with an inlet end of the atomization analysis unit (400) through the peristaltic pump assembly, characterized in that: The peristaltic pump assembly comprises an external peristaltic pump unit (200) and an internal peristaltic pump unit (300), the sample outlet end of the sample injection unit (100) is in communication with the sample inlet end of the external peristaltic pump unit (200), the sample outlet end of the external peristaltic pump unit (200) is in communication with the sample inlet end of the internal peristaltic pump unit (300), and the sample outlet end of the internal peristaltic pump unit (300) is in communication with the sample inlet end of the atomization analysis unit (400). ​ 2. The in-situ online quantitative analysis system based on an inductively coupled plasma optical spectrometer according to claim 1, characterized in that: The sample injection unit (100) comprises a reaction pool (1) and a sample outlet pipe (2), the sample inlet end of the sample outlet pipe (2) is inserted into the reaction pool (1) and in communication with the reaction pool (1), and the sample outlet end of the sample outlet pipe (2) is in communication with the sample inlet end of the external peristaltic pump unit (200).

3. The in-situ online quantitative analysis system based on an inductively coupled plasma optical spectrometer according to claim 2, characterized in that: The external peristaltic pump unit (200) comprises a filter (3), a first peristaltic pump (4), a first sample input pipe (5), a first mixer (7), a second sample input pipe (8), a second peristaltic pump (9), a second mixer (11), a first dilution pipe group and a second dilution pipe group, the sample outlet end of the sample outlet pipe (2) is in communication with the sample inlet end of the filter (3), the sample outlet end of the filter (3) is in communication with the sample inlet end of the first sample input pipe (5), the sample outlet end of the first sample input pipe (5) is in communication with the sample inlet end of the first mixer (7) through the first peristaltic pump (4), the liquid inlet end of the first dilution pipe group is inserted into an external dilution pool and in communication with the external dilution pool, the liquid outlet end of the first dilution pipe group is in communication with the liquid inlet end of the first mixer (7) through the first peristaltic pump (4), the sample inlet end of the second sample input pipe (8) is in communication with the sample outlet end of the first mixer (7), the sample outlet end of the second sample input pipe (8) is in communication with the sample inlet end of the second mixer (11) through the second peristaltic pump (9), the sample outlet end of the second mixer (11) is in communication with the sample inlet end of the internal peristaltic pump unit (300), the liquid inlet end of the second dilution pipe group is inserted into the external dilution pool and in communication with the external dilution pool, and the liquid outlet end of the second dilution pipe group is in communication with the liquid inlet end of the second mixer (11) through the second peristaltic pump (9).

4. The in-situ online quantitative analysis system based on an inductively coupled plasma optical spectrometer according to claim 3, characterized in that: The filter membrane arranged in the filter (3) is a filter membrane with a pore size of 0.45 um.

5. The in-situ on-line quantitative analysis system based on an inductively coupled plasma optical spectrometer according to claim 4, characterized in that: The first dilution pipe group comprises N first dilution pipes (6), N is a positive integer, the liquid inlet end of each first dilution pipe (6) is inserted into the external dilution pool and in communication with the external dilution pool, the liquid outlet end of each first dilution pipe (6) is in communication with the liquid inlet end of the first mixer (7) through the first peristaltic pump (4), and a first flow limiting valve is connected in series on the liquid outlet end of the first dilution pipe (6).

6. The in-situ online quantitative analysis system based on an inductively coupled plasma optical spectrometer according to claim 5, characterized in that: The second dilution pipe group comprises Z second dilution pipes (10), Z is a positive integer, the liquid inlet end of each second dilution pipe (10) is inserted into the external dilution pool and in communication with the external dilution pool, the liquid outlet end of each second dilution pipe (10) is in communication with the liquid inlet end of the second mixer (11) through the second peristaltic pump (9), and a second flow limiting valve is connected in series on the liquid outlet end of the second dilution pipe (10).

7. The in-situ online quantitative analysis system based on an inductively coupled plasma optical spectrometer according to claim 6, characterized in that: The internal connection peristaltic pump unit (300) comprises a third sample input pipe (12), a third peristaltic pump (14), a third mixer (15), a sample discharge pipe (16) and a third dilution pipe group. The sample input end of the third sample input pipe (12) is in communication with the sample output end of the second mixer (11). The sample output end of the third sample input pipe (12) is in communication with the sample input end of the third mixer (15) through the third peristaltic pump (14). The sample output end of the third mixer (15) is in communication with the sample input end of the sample discharge pipe (16). The sample output end of the sample discharge pipe (16) is in communication with the sample input end of the atomization analysis unit (400). The liquid input end of the third dilution pipe is inserted into and in communication with the external dilution tank. The liquid output end of the third dilution pipe is in communication with the liquid input end of the third mixer (15) through the third peristaltic pump (14).

8. The in-situ online quantitative analysis system based on an inductively coupled plasma optical spectrometer according to claim 6, characterized in that: The third dilution pipe group comprises Q third dilution pipes (13), wherein Q is a positive integer. The liquid input end of each third dilution pipe (13) is inserted into and in communication with the external dilution tank. The liquid output end of each third dilution pipe (13) is in communication with the liquid input end of the third mixer (15) through the third peristaltic pump (14). A third flow limiting valve is connected in series to the liquid output end of the third dilution pipe (13).

9. The in-situ online quantitative analysis system based on an inductively coupled plasma optical spectrometer according to claim 8, characterized in that: The value range of N is 1-3, the value range of Z is 1-3, and the value range of Q is 1-3.

10. The in-situ online quantitative analysis system based on an inductively coupled plasma optical spectrometer according to claim 9, characterized in that: The atomization analysis unit (400) comprises an atomizer (17), a plasma torch (18) and an analysis machine (19). The sample output end of the sample discharge pipe (16) is in communication with the sample input end of the atomizer (17). The waste liquid discharge end of the atomizer (17) is in communication with a waste liquid tank. The gas output end of the atomizer (17) is in communication with the gas input end of the plasma torch (18). The detection end of the analysis machine (19) is correspondingly arranged with the plasma torch (18).

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