Online detection device and method for total antimony in water body

Abstract

The invention belongs to the field of water quality analysis, and particularly relates to an online detection device and method for total antimony in a water body, the online detection device comprises a sampling unit, a conveying unit and a detection unit, the conveying unit is used for selectively conveying a water sample and a reagent, and the detection unit comprises a detection pool; a liquid inlet of the reaction container is communicated with the conveying unit, and a gas outlet is communicated with the switching module; the reagents comprise a reducing agent, a digesting agent, a reactant and an absorbent; the conveying unit is used for conveying an absorbent to the detection pool and conveying a reducing agent, a digesting agent and a reactant to the reaction container; the electromagnetic valves are respectively arranged at the upstream of the liquid inlet and the downstream of the gas outlet, and the heating module is used for heating the reaction container; and the switching module is connected with the conveying unit and is used for enabling the detection pool to be selectively communicated with the gas outlet or the reagent container in the conveying unit. The method has the advantages of online detection, accurate detection result and the like, and can be applied to analysis of total antimony in water.

Description

Technical Field

[0001] The present invention relates to water quality analysis, in particular to an on-line detection device and method for total antimony in water. Background Art

[0002] Heavy metal ion pollution is an increasingly serious problem, posing a significant threat to the health and safety of animals, plants, and humans. Antimony and its compounds are toxic, and even very low concentrations can cause adverse effects on humans and animals. Antimony in nature primarily originates from human activities, rock weathering, and atmospheric deposition. Antimony compounds are also widely used in the manufacture of flame retardants, glass, ceramics, and coatings. For reasons of human health and environmental protection, antimony and its compounds have been designated as priority pollutants by the U.S. Environmental Protection Agency (USEPA) and the Council of the European Communities.

[0003] GB3838-2002 Surface Water Environmental Quality Standard specifies a standard limit of 5 μg / L for antimony. However, the minimum detection concentration for the UV-Vis spectrophotometry (SL 92-1994) method for the determination of antimony (5-Br-PADAP spectrophotometry) is 5 μg / L, which does not meet the detection requirements for antimony in surface water. The detection limit of anodic stripping voltammetry (AV) can reach 1 μg / L, which can meet the detection requirements for antimony in surface water and pollution sources. However, antimony normally exists in two valence states in water, antimony (III) and antimony (V). These two methods can only detect antimony (III) in water. The measurement results are lower than those of laboratory atomic absorption spectrophotometry (AAS), atomic fluorescence spectrophotometry (AFS), and inductively coupled plasma mass spectrometry (ICP-MS), and cannot accurately reflect the total amount of antimony in water. In addition, the reagents used in UV-Vis spectrophotometry (UV) are highly polluting, making it unsuitable for online detection.

[0004] Currently, the detection of antimony in water bodies usually involves collecting water samples on site, preserving them with acid, and then bringing them to the laboratory. Professionals prepare the samples and then test them according to the corresponding methods. This is time-consuming and labor-intensive, and cannot be used for rapid online testing.

[0005] Therefore, finding a method that can meet the needs of online detection of total antimony in both surface water and pollution source water has become one of the urgent problems that practitioners need to solve. Summary of the Invention

[0006] In order to solve the deficiencies in the above-mentioned prior art solutions, the present invention provides an online detection device for total antimony in water.

[0007] The purpose of the present invention is achieved through the following technical solutions: An online detection device for total antimony in water, comprising a sampling unit, a conveying unit, and a detection unit, wherein the conveying unit is used to selectively convey water samples and reagents, and the detection unit comprises a detection cell; the online detection device further comprises: A reaction container, wherein the liquid inlet of the reaction container is connected to the delivery unit, and the gas outlet is connected to the switching module; the reagents include a reducing agent, a digesting agent, a reactant and an absorbent; the delivery unit is used to deliver the absorbent to the detection cell, and to deliver the reducing agent, digesting agent and reactant to the reaction container; a solenoid valve and a heating module, wherein the solenoid valve is respectively arranged upstream of the liquid inlet and downstream of the gas outlet, and the heating module is used to heat the reaction container; A switching module is connected to the delivery unit and is used to selectively connect the detection pool to the gas outlet or the reagent container in the delivery unit.

[0008] The present invention also aims to provide an online detection method for total antimony in water, which is achieved through the following technical solutions: The online detection method of total antimony in water comprises the following steps: (A1) The sampling unit quantitatively extracts water samples online, and the water samples and digesters are sent to the reaction container through the delivery unit; (A2) The water sample and the digestion agent are heated in the reaction vessel, and the water sample is digested; (A3) The reducing agent is delivered to the reaction container through the delivery unit, and the valence state of antimony in the water sample is converted; (A4) the reactants are delivered to the reaction container through the delivery unit to generate stibine; (A5) Antimony hydrogen enters the detection cell and is absorbed by the absorbent; (A6) Detect antimony in the detection cell to obtain the total antimony concentration in the water sample.

[0009] Compared with the prior art, the present invention has the following beneficial effects: 1. Accurate test results; Through the steps of digestion, reduction and reaction, the conversion of antimony valence state is realized, achieving the purpose of detecting total antimony in water, accurately reflecting the total amount of antimony in water, and with a low detection limit; 2. Realized online detection; By using the combination of sampling unit, conveying unit, reaction container and detection pool, the online detection of total antimony in water is realized; 3. Automated testing; The quantification, transfer and reaction of water samples and reagents, as well as subsequent testing, are all automated, improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. Those skilled in the art will readily appreciate that these drawings are merely used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Figure 1 It is a structural schematic diagram of an online detection device for total antimony in water according to the present invention; Figure 2 It is a structural schematic diagram of an online detection device for total antimony in water according to the present invention; Figure 3 It is a schematic diagram of the detection signal of the present invention.

[0011] In the accompanying drawings, 1-sampling unit, 2-delivery unit, 11-second pump, 12-first pump, 21-quantification unit, 31-multi-way valve, 41-reaction container, 42-liquid inlet, 43-gas outlet, 51-switching module, 61-detection cell, 62-temperature control module, 71-reference electrode, 72-working electrode, 73-auxiliary electrode, 81-detector, 91-pure water container. DETAILED DESCRIPTION

[0012] Figure 1-Figure 3 The following description describes optional embodiments of the present invention to teach those skilled in the art how to implement and reproduce the present invention. In order to teach the technical solution of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will understand that variations or substitutions derived from these embodiments will be within the scope of the present invention. Those skilled in the art will understand that the following features can be combined in various ways to form multiple variations of the present invention. Thus, the present invention is not limited to the following optional embodiments, but is limited only by the claims and their equivalents.

[0013] Example 1.

[0014] An online detection device for total antimony in water according to an embodiment of the present invention is as follows: Figure 1 Shown, including: A sampling unit 1, a conveying unit 2 and a detection unit, wherein the conveying unit 2 is used to selectively convey water samples and reagents, and the detection unit includes a detection cell 61; The liquid inlet 42 of the reaction container 41 is connected to the delivery unit 2, and the gas outlet 43 is connected to the switching module 51; the reagents include a reducing agent, a digesting agent, a reactant and an absorbent; the delivery unit 2 is used to deliver the absorbent to the detection cell 61, and to deliver the reducing agent, digesting agent and reactant to the reaction container 41; The solenoid valves are respectively arranged upstream of the liquid inlet 42 and downstream of the gas outlet 43, and the heating module is used to heat the reaction container 41; The switching module 51 is connected to the delivery unit 2 and is used to enable the detection cell 61 to selectively connect to the gas outlet 43 or the reagent container in the delivery unit 2 .

[0015] In order to reduce the complexity of the structure, further, as Figure 2 As shown, the delivery unit 2 adopts a multi-way valve 31, and the ports of the multi-way valve 31 are respectively connected to the sampling unit 1, the inlet of the reaction container 41, the switching module 51 and the reagent container.

[0016] In order to speed up the reaction, the online detection device further includes: The first pump 12 has an inlet connected to the air, and an outlet connected to the liquid inlet 42 .

[0017] In order to improve the detection accuracy, the detection unit further includes a temperature control module 62 and a working electrode 72, a reference electrode 71 and an auxiliary electrode 73 respectively arranged in the detection pool 61, and the reagent also includes an electrolyte. The temperature control module 62 is used to adjust the temperature of the liquid in the detection pool 61, and the transport unit 2 is used to deliver the electrolyte to the detection pool 61.

[0018] The online detection method for total antimony in water according to an embodiment of the present invention comprises the following steps: (A1) The sampling unit 1 quantitatively extracts water samples online, and the water samples and digestion agents are delivered to the reaction container 41 through the delivery unit 2; (A2) The water sample and the digestion agent are heated in the reaction vessel 41, and the water sample is digested; (A3) The reducing agent is delivered to the reaction container 41 through the delivery unit 2, and the valence state of antimony in the water sample is converted; (A4) The reactants are delivered to the reaction container 41 through the delivery unit 2 to generate antimony hydrogen; (A5) Antimony hydrogen enters the detection cell 61 and is absorbed by the absorbent; (A6) Detecting antimony in the detection cell 61 to obtain the total antimony concentration in the water sample.

[0019] In order to improve the detection efficiency, further, in step (A3), the absorbent is delivered to the detection cell 61 through the delivery unit 2 .

[0020] In order to improve the detection accuracy, further, in step (A5), after the antimony hydrogen is absorbed, the electrolyte is sent to the detection cell 61 through the delivery unit 2; In step (A6), the concentration of total antimony is obtained using anodic stripping voltammetry.

[0021] In order to accelerate the reaction, further, in step (A4), air is introduced into the reaction container 41 .

[0022] Example 2.

[0023] This is an application example of the online detection device and method for total antimony in water according to Example 1 of the present invention.

[0024] In this application example, if Figure 2 As shown, the sampling unit 1 includes a second pump 11 (a high-precision integrated plunger pump is used in this embodiment) and a quantitative unit 21 (using a liquid storage ring). The second pump 11 extracts external water samples or pure water in the pure water container 91.

[0025] The conveying unit 2 adopts a twelve-way rotary valve 31, the ports of which are respectively connected to the air, the quantitative unit 21, the switching module 51, the liquid inlet 42 of the reaction container 41 and various reagent containers BG, including the digester container B, the reducing agent container C, the reactant container E, the absorbent container F, the standard solution container G and the electrolyte container D.

[0026] The digester is a 2% (V:V) nitric acid solution, the reducing agent is a 2% (W / V) L-cysteine solution, the reactant is a mixed solution of 1.5% (W / V) sodium borohydride and 0.5% (W / V) sodium hydroxide, the absorbent is a 95% ethanol solution, and the electrolyte is a 0.6M hydrochloric acid solution.

[0027] The first pump 12 is a peristaltic pump for extracting external air as needed and delivering it into the reaction vessel 41 through the liquid inlet 42. The switching module 51 is a two-position three-way valve, and its outlet is connected to the bottom inlet of the detection cell 61.

[0028] The bottom of the reaction vessel 41 is provided with a liquid inlet 42, and the top is provided with a gas outlet 43. The gas outlet 43 is connected to the switching module 51. Solenoid valves are respectively provided upstream of the liquid inlet 42 and downstream of the gas outlet 43, so that when the solenoid valves are closed, the reaction vessel 41 becomes a closed space. The heating module is used to heat the liquid in the reaction vessel 41.

[0029] The detection cell 61 is provided with a reference electrode 71 , a gold disk working electrode 72 and an auxiliary electrode 73 , and the three electrodes are respectively connected to a detector 81 . The temperature control module 62 is used to control the temperature of the liquid in the detection cell 61 .

[0030] The online detection method for total antimony in water according to an embodiment of the present invention, that is, the working method of the online detection device according to this embodiment, comprises the following steps: (A1) Water sample and digester delivery.

[0031] The solenoid valve of the second pump 11 is switched to the normally closed port. After extracting 5 mL of pure water from the pure water container 91, the solenoid valve is switched to the normally open port. At the same time, the multi-way valve 31 is switched to port 4. Then the second pump 11 is emptied. This step is repeated twice. At this time, the quantitative unit 21 is filled with pure water.

[0032] The multi-way valve 31 is switched to port 12, the second pump 11 extracts 0.2 mL of air, and then switches to port 5. The second pump 11 extracts 2.5 mL of water sample. After switching to port 3, the second pump 11 is emptied to complete the filling of the water sample tube upstream of port 5, so as to improve the accuracy of subsequent water sample quantification.

[0033] The multi-way valve 31 is switched to port 12, the second pump 11 extracts 0.2mL of air, switches to port 5, the second pump 11 extracts 3mL of water sample, switches to port 2, opens the upper and lower solenoid valves of the reaction container 41, and switches the switching module 51 to the normally open position, the second pump 11 is emptied, and the extracted water sample enters the reaction container 41; the multi-way valve 31 is switched to port 12, the second pump 11 extracts 3mL of air, switches to port 2, and empties.

[0034] Similarly, replace port 5 with port 11 and repeat the steps to deliver 0.6 mL of digester into the reaction container 41.

[0035] (A2) Close the solenoid valves upstream and downstream of the reaction vessel 41 to start water sample digestion. The digestion temperature is 135°C and the digestion time is 15 minutes. After the digestion is completed, the temperature of the reaction vessel 41 drops to 80°C.

[0036] (A3) The multi-way valve 31 switches to port 12, and the second pump 11 draws 0.2 mL of air. The valve switches to port 10, and the second pump 11 draws 2.5 mL of reducing agent. After switching to port 3, the second pump 11 empties the reducing agent line between port 10 and reducing agent container C, completing the filling.

[0037] The multi-way valve 31 is switched to port 12, the second pump 11 extracts 0.2 mL of air, switches to port 10, the second pump 11 extracts 1.2 mL of reducing agent, switches to port 2, and then opens the upstream and downstream solenoid valves of the reaction container 41, the second pump 11 is emptied, and the reducing agent enters the reaction container 41; the multi-way valve 31 is switched to port 12, the second pump 11 extracts 3 mL of air, switches to port 2, and empties.

[0038] The reduction was started, the temperature of the reaction vessel 41 was controlled to 80° C., and the reduction time was 5 min.

[0039] After the reduction is completed, the multi-way valve 31 is switched to port 12, the second pump 11 extracts 0.2 mL of air, switches to port 7, the second pump 11 extracts 2.5 mL of absorbent, and after switching to port 3, the second pump 11 is emptied, completing the filling of the absorbent tube between port 7 and absorbent container F.

[0040] The multi-way valve 31 is switched to port 12, the second pump 11 extracts 0.2 mL of air, switches to port 7, the second pump 11 extracts 3 mL of absorbent, switches to port 1, and then switches the switching module 51 to the normally closed port, the second pump 11 is emptied, and the absorbent enters the detection tank 61; the multi-way valve 31 is switched to port 12, the second pump 11 extracts 3 mL of air, switches to port 1, and empties.

[0041] (A4) The temperature of the reaction container 41 is lowered to room temperature.

[0042] The multi-way valve 31 is switched to port 12, and the second pump 11 extracts 0.2 mL of air. The multi-way valve 31 is switched to port 12, and the second pump 11 extracts 2.5 mL of reactant. After switching to port 3, the second pump 11 is emptied, completing the filling of the reactant tube between port 8 and reactant container E. The multi-way valve 31 is switched to port 12, the second pump 11 extracts 0.2 mL of air, switches to port 8, the second pump 11 extracts 2.4 mL of reactant, switches to port 2, opens the upstream and downstream solenoid valves of the reaction container 41 and switches the switching module 51 to the normally open position, the second pump 11 is emptied, and the reactant enters the reaction container 41; the multi-way valve 31 is switched to port 12, the second pump 11 extracts 3 mL of air, switches to port 2, and empties.

[0043] The first pump 12 is turned on, and air enters the reaction container 41 through the first pump 12 and the liquid inlet 42 in sequence, stirring the liquid in the reaction container. The first pump 12 is turned on for 3 minutes and then turned off.

[0044] The antimony hydrogen generated by the reaction enters the detection cell 61 through the gas outlet 43 and the switching module 51 .

[0045] (A5) The hydrogen antimonide that has entered the detection cell 61 is absorbed by the absorbent.

[0046] (A6) The multi-way valve 31 is switched to port 12, and the second pump 11 extracts 0.2 mL of air. It is switched to port 9, and the second pump 11 extracts 2.5 mL of electrolyte. After switching to port 3, the second pump 11 empties the electrolyte, completing the filling of the electrolyte tube between port 9 and electrolyte container D.

[0047] The multi-way valve 31 is switched to port 12, the second pump 11 extracts 0.2 mL of air, switches to port 9, the second pump 11 extracts 3 mL of electrolyte, switches to port 1, and then switches the switching module 51 to the normally closed port, the second pump 11 is emptied, and the electrolyte enters the detection cell 61; the multi-way valve 31 is switched to port 12, the second pump 11 extracts 3 mL of air, switches to port 1, and empties.

[0048] In the detection cell 61, a three-electrode system is composed of a gold electrode as a working electrode 72, a silver / silver chloride electrode as a reference electrode 71, and a platinum electrode as an auxiliary electrode 73. The antimony content is detected by anodic stripping voltammetry. Specifically, the three electrodes are connected to the electrochemical detector 81, and the heating function of the temperature control module 62 is turned on to control the solution in the detection cell 61 at a constant temperature of 45°C.

[0049] Set the enrichment voltage to -0.4V, the enrichment time to 200S, the standing time to 15S, the stripping voltage range to -0.3~0.4V, the cleaning voltage to 0.5V, and the cleaning time to 60S. During the enrichment and cleaning process, the stirring bar was controlled to rotate, and the stripping voltammetric curve of antimony in the water sample and the corresponding stripping peak area S were obtained. 样 .

[0050] The multi-way valve 31 switches to port 12, the second pump 11 extracts 0.2 mL of air, switches to port 1, and simultaneously switches the switching module 51 to the normally closed port. The second pump 11 extracts 4.5 mL of waste liquid from the detection cell 61, switches to port 3, and then empties the waste liquid. This step is repeated once. The second pump 11 switches to the normally closed port, extracts 3.5 mL of pure water, switches to the normally open port, the multi-way valve 31 switches to port 1, the second pump 11 empties the waste liquid, and the pure water enters the detection cell 61. This step is repeated once. The second pump 11 switches to the normally open port, the multi-way valve 31 switches to port 12, extracts 4 mL of air, and then empties the waste liquid.

[0051] Control the stirring bar of the detection pool 61 to stir for 15S, switch the multi-way valve 31 to port 12, and the second pump 11 extracts 0.2mL of air and switches to port 1. At the same time, the switching module 51 switches to the normally closed port, and the second pump 11 extracts 4.5mL of waste liquid in the detection pool 61. After switching to port 3, the second pump 11 empties. Repeat this step once to complete the cleaning of the detection pool 61 and the pipeline (between the multi-way valve 31 and the detection pool 61).

[0052] The multi-way valve 31 is switched to port 12, and the second pump 11 extracts 0.2 mL of air. The multi-way valve 31 is switched to port 6, and the second pump 11 extracts 2.5 mL of standard solution (total antimony concentration C 标 ), after switching to port 3, the second pump 11 is emptied to complete the filling of the standard liquid pipe between port 6 and standard liquid container G.

[0053] The multi-way valve 31 switches to port 12, the second pump 11 pumps 0.2 mL of air, switches to port 6, the second pump 11 pumps 3 mL of standard solution, switches to port 1, and then switches the switching module 51 to the normally closed port. The second pump 11 is emptied, and the standard solution enters the detection cell 61. The multi-way valve 31 switches to port 12, the second pump 11 pumps 0.2 mL of air, switches to port 9, the second pump 11 pumps 3 mL of electrolyte, switches to port 1, and then switches the switching module 51 to the normally closed port. The second pump 11 is emptied; the multi-way valve 31 switches to port 12, the second pump 11 pumps 3 mL of air, switches to port 1, and then empties.

[0054] Repeat the above steps to obtain the stripping voltammetric curve of antimony in the standard solution and the corresponding stripping peak area S 标 .

[0055] Calculate the total antimony concentration C in the water sample based on the dissolution peak area 样 =C 标 ×S 样 / S 标 .

[0056] Repeat the above cleaning steps to complete the cleaning of the detection cell 61.

[0057] Cleaning process: The second pump 11 is switched to the normally closed port, extracting 4 mL of pure water. The pump is then switched to the normally open port. The multi-way valve 31 is switched to port 2. The switching module 51 is switched to the normally open port. The second pump 11 is emptied, and the pure water enters the reaction vessel 41. This step is repeated once. The second pump 11 is switched to the normally open port. The multi-way valve 31 is switched to port 12, extracting 4 mL of air, and then evacuating the water. The first pump 12 is controlled to rotate for 15 seconds. The multi-way valve 31 is switched to port 12. The second pump 11 extracts 0.2 mL of air and is switched to port 2. The second pump 11 extracts 4.5 mL. After switching to port 4, the second pump 11 is emptied. This step is repeated once.

[0058] Emptying process: The second pump 11 is switched to the normally open position, the multi-way valve 31 is switched to port 12, 2.5 mL of air is extracted, and the multi-way valve 31 is switched to port 5 to empty the air. Repeat this step to empty the pipes between each reagent container and the multi-way valve 31 to complete a single measurement process.

[0059] The above device and method were used to test the antimony 0.04 mg / L standard substance in water. The concentration of the standard solution was 0.1 mg / L. After 6 consecutive tests, the results are as follows: like Figure 3As shown, the dissolution peak of antimony (III) is around 0.08V, and the dissolution peaks of 0.04 mg / L and 0.1 mg / L were tested 6 times with good consistency. The average value of the test results was 0.0412 mg / L, and the average value of the atomic fluorescence test results was 0.0401 mg / L. The accuracy of the measurement results can meet the requirements of online detection of antimony in water; the detection limit measurement result of the method and device of the present invention is 0.0008 mg / L, indicating that the method and device can be applied to the detection of antimony content in surface water.

[0060] Example 3.

[0061] The application example of the online detection device and method for total antimony in water according to Example 1 of the present invention is different from Example 2 in that: 1. The second pump 11 in the sampling unit 1 adopts a micro high-precision syringe pump.

[0062] 2. The conveying unit 2 adopts a twelve-way annular valve group or a double-row six-way valve group.

Claims

1. An online detection device for total antimony in water, comprising a sampling unit, a conveying unit and a detection unit, wherein the conveying unit is used to selectively convey water samples and reagents, and the detection unit comprises a detection cell; characterized in that: The online detection device also includes: A reaction container, wherein the liquid inlet of the reaction container is connected to the delivery unit, and the gas outlet is connected to the switching module; the reagents include a reducing agent, a digesting agent, a reactant and an absorbent; the delivery unit is used to deliver the absorbent to the detection cell, and to deliver the reducing agent, digesting agent and reactant to the reaction container; a solenoid valve and a heating module, wherein the solenoid valve is respectively arranged upstream of the liquid inlet and downstream of the gas outlet, and the heating module is used to heat the reaction container; A switching module is connected to the delivery unit and is used to selectively connect the detection pool to the gas outlet or the reagent container in the delivery unit.

2. The online detection device for total antimony in water according to claim 1, characterized in that: The delivery unit adopts a multi-way valve, and the ports of the multi-way valve are respectively connected to the sampling unit, the inlet of the reaction container, the switching module and the reagent container.

3. The online detection device for total antimony in water according to claim 1, characterized in that: The online detection device also includes: A pump is provided, wherein the inlet of the pump is connected to the air, and the outlet of the pump is connected to the liquid inlet.

4. The online detection device for total antimony in water according to claim 1, characterized in that: The detection unit also includes a temperature control module and a working electrode, a reference electrode and an auxiliary electrode respectively arranged in the detection cell. The reagent also includes an electrolyte. The temperature control module is used to adjust the temperature of the liquid in the detection cell, and the delivery unit is used to deliver the electrolyte to the detection cell.

5. The online detection device for total antimony in water according to claim 4, characterized in that: The working electrode is a gold disk electrode.

6. The online detection device for total antimony in water according to claim 1, characterized in that: The reducing agent is L-cysteine solution, the reactant is a mixed solution of sodium borohydride and sodium hydroxide, and the absorbent is ethanol solution.

7. An online detection method for total antimony in water comprises the following steps: (A1) The sampling unit quantitatively extracts water samples online, and the water samples and digesters are sent to the reaction container through the delivery unit; (A2) The water sample and the digestion agent are heated in the reaction vessel, and the water sample is digested; (A3) The reducing agent is delivered to the reaction container through the delivery unit, and the valence state of antimony in the water sample is converted; (A4) the reactants are delivered to the reaction container through the delivery unit to generate stibine; (A5) Antimony hydrogen enters the detection cell and is absorbed by the absorbent; (A6) Detect antimony in the detection cell to obtain the total antimony concentration in the water sample.

8. The online detection method according to claim 7, characterized in that: In step (A3), the absorbent is delivered to the detection cell through a delivery unit.

9. The online detection method according to claim 7, characterized in that: In step (A5), after the antimony hydrogen is absorbed, the electrolyte is sent to the detection cell through the delivery unit; In step (A6), the concentration of total antimony is obtained using anodic stripping voltammetry.

10. The online detection method according to claim 7, characterized in that: In step (A4), air is introduced into the reaction container.

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