Full-automatic stannous chloride-cold atom absorption mercury measuring system

Abstract

The full-automatic stannous chloride-cold atom absorption mercury measuring system comprises a solution conveying device, a reaction device, a gas-liquid separation device, an enrichment device and a detection device, the solution conveying device is used for conveying a carrier current and a reducing agent to the reaction device, the reaction device is used for mixing the reducing agent, a carrier gas and a sample, and the gas-liquid separation device is used for separating the carrier gas from the sample. The gas-liquid separation device is used for removing water vapor in a sample, the enrichment device is used for enriching a target object, and the detection device is used for detecting the target object. When the full-automatic stannous chloride-cold atom absorption mercury measuring system is used for measuring mercury, the body health of experimenters can be ensured, and the complicated operation is simplified. The full-automatic stannous chloride-cold atom absorption mercury measuring system disclosed by the utility model is environment-friendly, safe and simple and convenient to operate.

Description

Technical Field

[0001] This utility model relates to rapid environmental detection, and in particular to a fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination. Background Technology

[0002] Mercury is a heavy metal pollutant that mainly exists in nature. It has strong toxicity, mobility, and bioaccumulation. It can accumulate in organisms through the food chain or food web, eventually causing serious harm to the human body. Therefore, it has become one of the key heavy metal elements to be detected.

[0003] Currently, the main methods for detecting total mercury are atomic fluorescence spectrometry (AFS) and cold vapor atomic absorption spectrometry (CVA). Compared with AFS, CVA has advantages such as higher precision and accuracy, and less susceptibility to environmental temperature and humidity. Instruments that can use CVA for mercury measurement include solid direct injection mercury analyzers and stannous chloride reduction-cold vapor atomic absorption analyzers. Compared to the former, the latter does not require expensive catalyst tubes, resulting in relatively lower detection costs. It is currently widely used in food safety, environmental protection, soil, surface water, and groundwater research.

[0004] The existing stannous chloride reduction-cold atomic absorption spectrometry mercury analyzer has a relatively simple structure, and many detection steps still need to be performed manually. When adding stannous chloride solution to the mercury vapor generator to reduce mercury ions, different reagents need to be switched frequently. The existing stannous chloride reduction-cold atomic absorption spectrometry mercury analyzer has the risk of mercury vapor leakage, which can easily harm the health of operators. In addition, the measurement results are not stable and the detection limit is high. When conducting large-scale sample testing, the workload of operators is large and the efficiency is low. The test results are prone to subjective errors and can no longer meet the needs of most laboratories for large-scale and automated testing. Utility Model Content

[0005] The purpose of this invention is to provide a fully automatic stannous chloride-cold atomic absorption spectrometry system for mercury determination that is simple to operate, saves time and effort.

[0006] This invention relates to a fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination, comprising a solution delivery device, a reaction device, a gas-liquid separation device, an enrichment device, and a detection device. The solution delivery device is connected to the reaction device, the reaction device is connected to the gas-liquid separation device, the gas-liquid separation device is connected to the enrichment device, and the enrichment device is connected to the detection device. The solution delivery device is used to deliver the carrier gas and reducing agent to the reaction device. The reaction device is used to mix the reducing agent, the carrier gas, and the sample. The gas-liquid separation device is used to remove water vapor from the sample. The enrichment device is used to enrich the target analyte, and the detection device is used to detect the target analyte.

[0007] The fully automatic stannous chloride-cold atomic absorption spectrometry mercury determination system of this utility model further includes a gas path device for providing carrier gas to the reaction device. The gas path device includes a gas source, a PVC gas path pipe, a pressure reducing valve, a mass flow meter, a gas path check valve, and a first through-plate connector. The gas source and the pressure reducing valve, the pressure reducing valve and the mass flow meter, the mass flow meter and the gas path check valve, and the gas path check valve and the first through-plate connector are all connected by PVC gas path pipes. The first through-plate connector is connected to the reaction device.

[0008] This invention relates to a fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination. The solution delivery device includes an autosampler, a peristaltic pump, and sample peristaltic pump tubing and reducing agent peristaltic pump tubing, each working in conjunction with the peristaltic pump. The reaction device is a four-way valve with interfaces A, B, C, and D. One end of the sample peristaltic pump tubing is connected to the injection needle of the autosampler via a capillary tube, and the other end is connected to interface A of the four-way valve via a capillary tube. One end of the reducing agent peristaltic pump tubing is connected to a reducing agent bottle via a capillary tube, and the other end is connected to interface C of the four-way valve via a capillary tube. Interface B of the four-way valve is connected to a first through-plate connector via a pipeline for connecting to a gas source. Interface D of the four-way valve is connected to a gas-liquid separation device via a pipeline.

[0009] This invention relates to a fully automatic stannous chloride-cold atomic absorption spectrometry system for mercury determination. The gas-liquid separation device includes a primary gas-liquid separator, a primary peristaltic pump, a secondary gas-liquid separator, a secondary peristaltic pump, a first solenoid valve, a condensation and dehydration device, a tertiary gas-liquid separator, and a second solenoid valve. The inlet of the primary gas-liquid separator is connected to the D-port of the four-way valve; the outlet of the primary gas-liquid separator is connected to the inlet of the secondary gas-liquid separator; and the drain outlet of the primary gas-liquid separator is connected to the primary peristaltic pump. The outlet of the secondary gas-liquid separator is connected to the inlet of the first solenoid valve; and the drain outlet of the secondary gas-liquid separator is connected to the secondary peristaltic pump. The outlet of the first solenoid valve is connected to the inlet of the condensation and dehydration device; the outlet of the condensation and dehydration device is connected to the inlet of the tertiary gas-liquid separator; the outlet of the tertiary gas-liquid separator is connected to the enrichment device; and the drain outlet of the tertiary gas-liquid separator is connected to the inlet of the second solenoid valve.

[0010] This invention relates to a fully automatic stannous chloride-cold atomic absorption spectrometry system for mercury determination. The enrichment device includes an amalgam tube, a heating element, and a third solenoid valve. The heating element is wrapped around the amalgam tube for heating it. The inlet of the amalgam tube is connected to the outlet of the three-stage gas-liquid separator via a pipeline, and the outlet of the amalgam tube is connected to the detection device.

[0011] This invention relates to a fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination. The detection device includes a light source, a long-path absorption cell, a delay tube, a short-path absorption cell, a first photocell, and a second photocell. The light source is a low-pressure mercury lamp. The long-path absorption cell, the delay tube, and the short-path absorption cell are connected by pipelines. The outlet of the amalgam tube is connected to the long-path absorption cell. The first photocell is used to detect the reference light intensity, and the second photocell is used to detect the sample light intensity.

[0012] The fully automatic stannous chloride-cold atomic absorption spectrometry mercury determination system of this invention further includes a waste gas receiving and treatment device, which is connected to a short optical path absorption cell and is used to receive and treat the waste gas discharged from the short optical path absorption cell.

[0013] This fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination eliminates the need for manual addition of reducing agents. Digested samples can be directly injected for analysis, avoiding cumbersome procedures and errors introduced by manual reagent addition. The instrument is fully enclosed, and exhaust gases are adsorbed using activated carbon, ensuring the health of laboratory personnel and simplifying complex operations. The addition of semiconductor condensation technology effectively reduces moisture ingress into the absorption cell, ensuring the detection process is unaffected by moisture. This fully automated stannous chloride-cold atomic absorption spectrometry system is environmentally friendly, safe, and easy to operate, making it highly valuable for widespread application. Attached Figure Description

[0014] Figure 1 This is a simplified schematic diagram of the fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination according to this invention.

[0015] Figure 2 This is a schematic diagram of the detection device. Detailed Implementation

[0016] like Figure 1 , Figure 2 As shown, the fully automated stannous chloride-cold atomic absorption spectrometry mercury determination system of this invention includes: a solution delivery device 2, a reaction device 3, a gas-liquid separation device 4, an enrichment device 5, and a detection device 6. The solution delivery device is connected to the reaction device, the reaction device is connected to the gas-liquid separation device, the gas-liquid separation device is connected to the enrichment device, and the enrichment device is connected to the detection device. The solution delivery device is used to deliver the carrier gas and reducing agent to the reaction device. The reaction device is used to mix the reducing agent, the carrier gas, and the sample. The gas-liquid separation device is used to remove water vapor from the sample. The enrichment device is used to enrich the target analyte, and the detection device is used to detect the target analyte.

[0017] The fully automatic stannous chloride-cold atomic absorption spectrometry mercury determination system of this utility model further includes a gas path device 1 for providing carrier gas to the reaction device. The gas path device 1 includes a gas source 11, a PVC gas path pipe 10, a pressure reducing valve 12, a mass flow meter 13, a gas path check valve 14, and a first through-plate connector 15. The gas source and the pressure reducing valve, the pressure reducing valve and the mass flow meter, the mass flow meter and the gas path check valve, and the gas path check valve and the first through-plate connector are all connected by PVC gas path pipes. The first through-plate connector 15 is connected to the reaction device.

[0018] This invention relates to a fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination. The solution delivery device 2 includes an autosampler, a peristaltic pump 21, and sample peristaltic pump tubing 22 and reducing agent peristaltic pump tubing 23, which are respectively coupled to the peristaltic pump. The reaction device 3 is a four-way valve with interfaces A, B, C, and D. One end of the sample peristaltic pump tubing is connected to the injection needle of the autosampler via a capillary connecting tube, and the other end is connected to interface A of the four-way valve via a capillary connecting tube. One end of the reducing agent peristaltic pump tubing is connected to a reducing agent bottle via a capillary connecting tube, and the other end is connected to interface C of the four-way valve via a capillary connecting tube. Interface B of the four-way valve is connected to the first through-plate connector 15 via a pipeline for connecting to a gas source. Interface D of the four-way valve is connected to the gas-liquid separation device 4 via a pipeline.

[0019] The fully automatic stannous chloride-cold atomic absorption spectrometry mercury determination system of this invention includes a gas-liquid separation device 4 comprising a primary gas-liquid separator 41 for primary water removal, a secondary gas-liquid separator 43 for secondary water removal, a condensation and dehydration device 46 for secondary water removal, and a tertiary gas-liquid separator 47 for secondary water removal.

[0020] The condensation and dehydration device 46 includes an inlet 461, an outlet 462, a heat dissipation device, and a cooling section. The gas-liquid separation device 4 has a simple structure and can perform multiple dehydration processes, effectively reducing the water vapor content entering the enrichment device 5 and the detection device 6, thereby improving the testing stability of the samples and the reliability of the results.

[0021] This invention relates to a fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination. The gas-liquid separation device 4 includes a primary gas-liquid separator 41, a primary peristaltic pump 42, a secondary gas-liquid separator 43, a secondary peristaltic pump 44, a first solenoid valve 45, a condensate removal device 46, a tertiary gas-liquid separator 47, and a second solenoid valve 48. The inlet 411 of the primary gas-liquid separator is connected to the D-port of the four-way valve, the outlet 412 of the primary gas-liquid separator is connected to the inlet of the secondary gas-liquid separator, and the drain 413 of the primary gas-liquid separator is connected to the inlet of the secondary peristaltic pump 48. The pump 42 is connected; the outlet 432 of the secondary gas-liquid separator is connected to the inlet 451 of the first solenoid valve, and the drain port 433 of the secondary gas-liquid separator is connected to the secondary peristaltic pump 44; the outlet 452 of the first solenoid valve is connected to the inlet 461 of the condensate removal device; the outlet 462 of the condensate removal device is connected to the inlet 471 of the tertiary gas-liquid separator; the outlet 472 of the tertiary gas-liquid separator is connected to the enrichment device, and the drain port 473 of the tertiary gas-liquid separator is connected to the inlet of the second solenoid valve 48.

[0022] The present invention discloses a fully automatic stannous chloride-cold atomic absorption spectrometry mercury determination system, wherein the enrichment device 5 includes an amalgam tube 51, a heating wire 52, and a third solenoid valve 53. The heating wire is wrapped around the amalgam tube for heating the amalgam tube. The inlet 511 of the amalgam tube is connected to the outlet 472 of the three-stage gas-liquid separator through a pipeline, and the outlet 512 of the amalgam tube is connected to the detection device.

[0023] This invention relates to a fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination. The detection device 6 includes a light source 64, a long-path absorption cell 61, a delay tube 62, a short-path absorption cell 63, a first photocell 65, and a second photocell 66. The light source is a low-pressure mercury lamp. The long-path absorption cell, delay tube, and short-path absorption cell are connected by pipelines. The outlet of the amalgam tube is connected to the long-path absorption cell. The first photocell is used to detect the reference light intensity, and the second photocell is used to detect the sample light intensity.

[0024] The fully automatic stannous chloride-cold atomic absorption mercury determination system of this invention further includes a waste gas receiving and treatment device 7, which is connected to a short optical path absorption cell and is used to receive and treat the waste gas discharged from the short optical path absorption cell.

[0025] Compared with existing technologies, the technical solution of this application uses an online reaction method to obtain mercury vapor, which can effectively avoid mercury vapor leakage and has great potential for widespread application.

[0026] The fully automated stannous chloride-cold atomic absorption spectrometry mercury determination system of this invention includes a solution delivery device 2, a reaction device 3, a gas-liquid separation device 4, an enrichment device 5, and a detection device 6. The solution delivery device 2 is used to deliver the carrier gas and reducing agent to the reaction device 3. The reaction device 3 is used to mix the reducing agent, carrier gas, and sample. The gas-liquid separation device 4 is used to remove water vapor from the sample. The enrichment device 5 is used to enrich the target analyte. The detection device 6 is used to detect the target analyte.

[0027] The fully automatic stannous chloride-cold atomic absorption spectrometry mercury determination system of this utility model further includes a gas path device 1, which includes a gas source 11, a PVC gas path pipe 10, a pressure reducing valve 12, a mass flow meter 13, a gas path check valve 14, and a first through-plate connector 15. The gas path device 1 is located on the left rear side of the instrument. The gas source 11 and the pressure reducing valve 12, the pressure reducing valve 12 and the mass flow meter 13, the mass flow meter 13 and the gas path check valve 14, and the gas path check valve 14 and the first through-plate connector 15 are all connected by PVC gas path pipes 10.

[0028] In the fully automatic stannous chloride-cold atomic absorption mercury determination system of this utility model, the connection between the B port of the four-way valve and the first through-plate connector 15 is a silicone tube.

[0029] In the fully automatic stannous chloride-cold atomic absorption spectrometry mercury determination system of this invention, the connecting pipe between the outlet 412 of the primary gas-liquid separator and the inlet 431 of the secondary gas-liquid separator is a capillary tube.

[0030] This invention relates to a fully automatic stannous chloride-cold atomic absorption spectrometry system for mercury determination. The enrichment device 5 includes an amalgam tube 51, a heating wire 52, and a third solenoid valve 53. The heating wire 52 is wrapped around the amalgam tube; it is used to enrich the target substance at low temperatures and to release the target substance when heated. The inlet 511 of the amalgam tube is connected to the outlet 472 of the three-stage gas-liquid separator via pipelines, and the outlet 512 of the amalgam tube is connected to the third solenoid valve 53.

[0031] This invention relates to a fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination. The furnace wire 52 is fixed at both ends by two ceramic terminals 54 and 55 for heating and releasing the target analyte. A fan is also installed at the rear end of the furnace wire to rapidly reduce its temperature, ensuring good enrichment of the target analyte for the next extraction.

[0032] This invention relates to a fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination. The detection device 6 includes a long-path absorption cell 61, a delay tube 62, a short-path absorption cell 63, a light source 64, a first photocell 65, and a second photocell 66. The light source 61 is a low-pressure mercury lamp. The long-path absorption cell 61, the delay tube 62, and the short-path absorption cell 63 are connected by pipelines. The first photocell 65 is used to detect the reference light intensity, and the second photocell 66 is used to detect the sample light intensity.

[0033] The fully automatic stannous chloride-cold atomic absorption spectrometry system for mercury determination of this invention further includes a waste gas receiving and treatment device 7. The waste gas receiving and treatment device 7 is connected to the outlet 631 of the short-path absorption cell 63.

[0034] The working process of the fully automated stannous chloride-cold atomic absorption mercury determination system of this invention is roughly as follows:

[0035] The peristaltic pump 21 rotates, and the sample and reducing agent enter the reaction device 3 through the sample peristaltic pump tube 22 and the reducing agent peristaltic pump tube 23, respectively, for mixing. Under the action of the carrier gas in the gas path device 1, the reaction products are carried into the gas-liquid separation device 4. In the first-stage gas-liquid separator 41, the second-stage gas-liquid separator 43, the condensation and dehydration device 46, and the third-stage gas-liquid separation device 47, the gaseous target substance and the waste liquid are separated. The waste liquid is discharged from the first-stage peristaltic pump 42, the second-stage peristaltic pump 44, and the second solenoid valve 48. Under the action of the carrier gas, the reaction products enter the enrichment device 5 and are enriched by the amalgam tube 51. Subsequently, the heating wire 52 releases the target substance, which enters the detection device 6 for detection and analysis. After the detection is completed, the waste gas enters the waste gas receiving and treatment device 7 from the outlet 631 of the short optical path absorption cell 63 and is collected. The waste gas is collected by adsorption using activated carbon.

[0036] In operation, the fully automatic stannous chloride-cold atomic absorption spectrometry system of this invention reduces divalent mercury to mercury vapor using stannous chloride in a mercury generator. The vapor is then carried into the absorption cell of the mercury analyzer by a carrier gas. Mercury atoms exhibit strong absorption at the resonance spectral line of the mercury lamp at a wavelength of 253.7 nm. Within a certain range of mercury concentration, since the absorption value is proportional to the concentration of mercury vapor, the mercury content can be determined by atomic absorption spectrometry at a wavelength of 253.7 nm.

[0037] Mercury analyzers that utilize the principle of cold atom absorption spectroscopy typically employ only a single absorption cell or a long / short absorption cell, with a length generally not exceeding 10 cm. This results in unsatisfactory detection limits when analyzing trace amounts of mercury, especially in surface water or groundwater samples.

[0038] This invention relates to a fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination. The detection device 6 includes a long-path absorption cell 61, a delay tube 62, a short-path absorption cell 63, a light source 64, a first photocell 65, and a second photocell 66. The light source 61 is a low-pressure mercury lamp. The long-path absorption cell 61, the delay tube 62, and the short-path absorption cell 63 are connected by pipelines. The first photocell 65 is used to detect the reference light intensity, and the second photocell 66 is used to detect the sample light intensity.

[0039] In this fully automatic stannous chloride-cold atomic absorption spectrometry system for mercury determination, the long-path absorption cell 61 and the short-path absorption cell 63 are parallel.

[0040] A light source is provided at the front end of the long optical path absorption cell 61 and at the front end of the short optical path absorption cell 63.

[0041] The first photovoltaic cell 65 and the second photovoltaic cell 66 are both located at the rear end of the long-path absorption cell 61 and the short-path absorption cell 63.

[0042] The detection device 6 also includes a temperature control system for keeping the absorption pool system within a temperature range of 100℃-150℃.

[0043] The temperature control system includes a housing that accommodates a long-path absorption cell 61, a delay tube 62, a short-path absorption cell 63, a light source 64, a first photovoltaic cell 65, and a second photovoltaic cell 66. The temperature control system includes a heating rod and a thermocouple disposed inside the housing, and a temperature controller disposed outside the housing. The temperature controller is connected to the heating rod and the thermocouple respectively to form a temperature control circuit.

[0044] The long optical path absorption cell has a steam inlet at its first end; the short optical path absorption cell has a waste gas outlet at its last end.

[0045] The length of the long optical path absorption cell is 20-30cm, and the length of the short optical path absorption cell is 10-15cm.

[0046] The divergent light from light source 64 is processed by a focusing lens to form focused parallel light that enters the long-path absorption cell 61. Part of the light is detected by the second photocell 66, and the mercury vapor produces spectral absorption at 253.65 nm, which is the first light intensity reduction. The degree of light intensity reduction is linearly related to a certain concentration, corresponding to ultra-low concentration mercury content analysis. The other part of the light is reflected and refracted into the short-path absorption cell 63 and then detected by the second photocell 66. The mercury vapor enters the short-path absorption cell 63 under the propulsion of the carrier gas and produces spectral absorption, which is the second light intensity reduction. The degree of light intensity reduction is linearly related to a certain concentration, corresponding to low concentration mercury content analysis.

[0047] Compared with existing technologies, the detection device 6 of the fully automatic stannous chloride-cold atomic absorption mercury determination system of this invention realizes dual absorption cell analysis by setting up a long optical path absorption cell 61 and a short optical path absorption cell 63 connected in series; that is, it can generate two spectral absorptions, and can simultaneously analyze ultra-low concentration and low concentration mercury, so as to achieve accurate analysis of ultra-trace mercury elements.

[0048] Compared with existing technologies, the fully automated stannous chloride-cold atomic absorption spectrometry mercury determination system of this invention eliminates the need for manual addition of reducing agents. The digested sample can be directly injected for analysis, perfectly avoiding the errors and cumbersome operation process caused by manual reagent addition. The instrument is fully enclosed, and the exhaust gas is adsorbed by activated carbon, which can ensure the health of the experimenters and simplify the complex operation. The addition of semiconductor condensation technology can effectively reduce the entry of water vapor into the absorption cell and ensure that the detection process is not affected by moisture.

[0049] The fully automatic stannous chloride-cold atomic absorption spectrometry mercury determination system of this invention is environmentally friendly, safe, and easy to operate, and has great potential for widespread application.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination, characterized in that, The system includes a solution delivery device, a reaction device, a gas-liquid separation device, an enrichment device, and a detection device. The solution delivery device is connected to the reaction device, the reaction device is connected to the gas-liquid separation device, the gas-liquid separation device is connected to the enrichment device, and the enrichment device is connected to the detection device. The solution delivery device is used to deliver the carrier gas and reducing agent to the reaction device. The reaction device is used to mix the reducing agent, carrier gas, and sample. The gas-liquid separation device is used to remove water vapor from the sample. The enrichment device is used to enrich the target analyte, and the detection device is used to detect the target analyte. The system also includes a gas path device for supplying carrier gas to the reaction device. The gas path device includes a gas source, a PVC gas pipe, a pressure reducing valve, a mass flow meter, a gas check valve, and a first through-plate connector. The gas source is connected to the pressure reducing valve, the pressure reducing valve to the mass flow meter, the mass flow meter to the gas path check valve, and the gas path check valve to the first through-plate connector, all using PVC gas pipes. The first through-plate connector is connected to the reaction device. The solution delivery device includes an autosampler, a peristaltic pump, and sample peristaltic pump tubing and reducing agent peristaltic pump tubing that cooperate with the peristaltic pump. The reaction device is a four-way valve with interfaces A, B, C, and D. One end of the sample peristaltic pump tubing is connected to the injection needle of the autosampler via a capillary connector, and the other end of the sample peristaltic pump tubing is connected to interface A of the four-way valve via a capillary connector. One end of the reducing agent peristaltic pump tubing is used to connect to the reducing agent via a capillary connector. The reducing agent bottle is connected, and the other end of the reducing agent peristaltic pump tube is connected to the C port of the four-way valve through a capillary connecting tube; the B port of the four-way valve is connected to the first through-plate connector through a pipeline for connecting to the gas source; the D port of the four-way valve is connected to the gas-liquid separation device through a pipeline. The gas-liquid separation device includes a primary gas-liquid separator, a primary peristaltic pump, a secondary gas-liquid separator, a secondary peristaltic pump, a first solenoid valve, a condensate removal device, a tertiary gas-liquid separator, and a second solenoid valve. The inlet of the primary gas-liquid separator is connected to the D port of the four-way valve, the outlet of the primary gas-liquid separator is connected to the inlet of the secondary gas-liquid separator, and the drain port of the primary gas-liquid separator is connected to the primary peristaltic pump; the second... The outlet of the first-stage gas-liquid separator is connected to the inlet of the first solenoid valve, and the outlet of the second-stage gas-liquid separator is connected to the second-stage peristaltic pump; the outlet of the first solenoid valve is connected to the inlet of the condensate removal device; the outlet of the condensate removal device is connected to the inlet of the third-stage gas-liquid separator; the outlet of the third-stage gas-liquid separator is connected to the enrichment device, and the outlet of the third-stage gas-liquid separator is connected to the inlet of the second solenoid valve. The condensate removal device includes an inlet, an outlet, a heat dissipation device, and a cooling section. The connection pipe between the B port of the four-way valve and the first through-plate connector is a silicone tube, and the connection pipe between the outlet of the first-stage gas-liquid separator and the inlet of the second-stage gas-liquid separator is a capillary tube.

2. The fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination according to claim 1, characterized in that, The enrichment device includes an amalgam tube, a heating wire, and a third solenoid valve. The heating wire is wrapped around the amalgam tube for heating it. The inlet of the amalgam tube is connected to the outlet of the three-stage gas-liquid separator via a pipeline, and the outlet of the amalgam tube is connected to the detection device.

3. The fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination according to claim 2, characterized in that, The detection device includes a light source, a long-path absorption cell, a delay tube, a short-path absorption cell, a first photocell, and a second photocell. The light source is a low-pressure mercury lamp. The long-path absorption cell, the delay tube, and the short-path absorption cell are connected by pipelines. The outlet of the amalgam tube is connected to the long-path absorption cell. The first photocell is used to detect the reference light intensity, and the second photocell is used to detect the sample light intensity.

4. The fully automated stannous chloride-cold atomic absorption spectrometry system for mercury determination according to claim 3, characterized in that, It also includes a waste gas receiving and treatment device, which is connected to the short optical path absorption cell and is used to receive and treat the waste gas discharged from the short optical path absorption cell.

Images