Gaseous mercury air-sea flux continuous automatic monitoring device and method thereof

Abstract

The invention discloses a gaseous mercury air-sea flux continuous automatic monitoring device and a method thereof, and relates to the field of air-sea flux measurement. Related data of the gaseous mercury air-sea flux are measured through operation of the monitoring device; the related data specifically comprise surface seawater temperature, sample water volume, gaseous mercury concentration in purge gas and gaseous mercury concentration in external environment atmosphere; the gas-state mercury air-sea flux is calculated by measuring related data and applying a film gas exchange model, and a result is obtained. According to the monitoring method, manual operation is not needed, the operation difficulty is greatly reduced, the operation requirement for personnel is low, and rapid and continuous calculation can be carried out in a short time.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of sea-air flux measurement, and in particular to a device and method for continuous automatic monitoring of gaseous mercury sea-air flux. Background Art

[0002] Mercury is a toxic heavy metal pollutant that exists in the atmosphere in the form of gaseous elemental mercury (GEM) and reactive gaseous mercury (RGM), and can be transported over long distances with atmospheric circulation. As an important source of mercury, the ocean continuously adds mercury to the atmosphere through the sea-air exchange process, thereby affecting the global mercury cycle. Therefore, monitoring the sea-air flux of gaseous mercury is of great significance for assessing the pollution status of mercury, understanding its transmission mechanism, and formulating effective pollution prevention and control strategies.

[0003] Based on the characteristics of the monitoring area and the research purpose, the commonly used specific sea-air exchange models include double membrane theory, eddy diffusion theory, etc. For the monitoring of gaseous mercury sea-air flux, the calculation method in the existing technology is an indirect calculation method, using the "backflow principle" to reversely introduce a certain amount of gas into a container containing a certain amount of water to achieve equilibrium between gas and liquid, and use "Henry's law" to calculate, DGM = [GEM] 平衡 / [H'], the above methods are all manually operated, which is difficult to operate, has high requirements on personnel operation, is time-consuming and labor-intensive, and has low time resolution. In summary, there is an urgent problem in the existing technology that can be easily operated and automatically monitor the sea-to-air flux of gaseous mercury, which needs to be solved. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a device and method for continuously and automatically monitoring the sea-air flux of gaseous mercury, so as to solve the technical problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A device and method for continuously and automatically monitoring the flux of gaseous mercury in the sea, the monitoring device comprising a purge chamber, the purge chamber being respectively connected to a flow control meter, a three-way switching valve four, a three-way switching valve three, and a three-way switching valve two; the output end of the flow control meter is connected to a three-way switching valve one, and the other execution ends of the three-way switching valve one are respectively connected to a water pumping peristaltic pump and a water outlet pipe;

[0007] The remaining execution ends of the three-way switching valve are respectively connected to a two-way control valve and an exhaust pipe, and the other execution end of the two-way control valve is connected to a high-pressure carrier gas bottle;

[0008] The other execution ends of the three-way switching valve 3 are respectively connected to the zero air generator and the drain water pipe, and the other execution end of the zero air generator is connected to the drying pipe 1;

[0009] The other execution ends of the three-way switching valve 2 are respectively connected to the drying pipe 2 and the external environment atmosphere. A wind speed measuring instrument is set in the external environment atmosphere. The wind speed at the height Z measured by the wind speed measuring instrument is u z , the unit is m / s; the other end of the drying tube 2 is connected to the gaseous mercury analyzer, and the three-way switching valve 1, the three-way switching valve 2, the three-way switching valve 3, the three-way switching valve 4 and the two-way control valve are all connected to the single-chip controller by telecommunication;

[0010] There are two steps:

[0011] The data related to the sea-to-air flux of gaseous mercury are measured by operating the monitoring device; the relevant data specifically include the surface seawater temperature, the volume of the sample water body, the concentration of gaseous mercury in the purge gas, and the concentration of gaseous mercury in the external ambient atmosphere;

[0012] The results were obtained by measuring relevant data and calculating the sea-air flux of gaseous mercury using a thin film gas exchange model;

[0013] The operation process of the monitoring device includes the following four stages:

[0014] Stage 1, waiting state: the three-way switching valve 1, the three-way switching valve 2, the three-way switching valve 3, the three-way switching valve 4 and the two-way control valve are all in the closed state, the water pumping peristaltic pump is always in the working state, extracting sample water from the surface seawater and discharging it from the outlet pipe, and the time is set to T1; a temperature measuring instrument is set in the surface seawater to measure the surface seawater temperature E;

[0015] Stage 2, water sampling: the three-way switching valve 1 and the three-way switching valve 4 are in the open state, the three-way switching valve 2, the three-way switching valve 3, and the two-way control valve are all in the closed state, the sample water is output to the inner cavity of the purge chamber through the three-way switching valve 1 and the flow controller, the air in the inner cavity of the purge chamber is squeezed and discharged from the exhaust pipe connected to the three-way switching valve 4, and the volume of the sample water flowing into the inner cavity of the purge chamber measured by the flow controller is V, in L; the time is set to T2;

[0016] Stage 3, purge analysis: the three-way switching valve 2 and the three-way switching valve 3 are in the open state, the three-way switching valve 1, the three-way switching valve 4 and the two-way control valve are all in the closed state, and the dry clean air enters from the other end of the drying tube 1, and enters the purge chamber through the zero gas generator and the three-way switching valve 3 to purge the sample water body, and the purge gas directly enters the gaseous mercury analyzer through the three-way switching valve 2 and the drying tube 2; the time is set to T3;

[0017] Stage 4, drainage stage: the three-way switching valve 1, three-way switching valve 2, three-way switching valve 3, and three-way switching valve 4 are all in the closed state, and the two-way control valve is in the open state; the high-purity argon gas in the high-pressure carrier gas bottle enters the inner cavity of the purge chamber through the two-way control valve, and the sample seawater in the inner cavity of the purge chamber is discharged through the outlet pipe, and the time is T4.

[0018] Preferably, T1+T2+T3+T4=2h, T1+T2+T4=1h.

[0019] Preferably, the gaseous mercury analyzer measures a total of 6 groups of gaseous mercury concentrations in the purge gas within the purge analysis stage T3, which are C1, C2, C3, C4, C5, and C6 respectively; in stages one, two, and four, the gaseous mercury analyzer detects a total of 6 groups of gaseous mercury concentrations in the external ambient atmosphere, which are C7, C8, C9, C10, C11, and C12 respectively.

[0020] Preferably, the calculation formula of the thin film gas exchange model is:

[0021] F = KW (DGM-GEM / H'(t));

[0022] in,

[0023] F: is the sea-to-air flux of gaseous mercury;

[0024] KW: gas transfer rate at the water-gas interface; KW = 0.31*U Z 2 (S Hg / 600)-0.5,S Hg is the Schmidt number of mercury;

[0025] DGM: gaseous mercury dissolved in surface seawater, unit is pg / L,

[0026] DGM=(C1+C2+C3+C4+C5+C6)*10 / V;

[0027] GEM: is the concentration of gaseous mercury in the external atmosphere, in ng m -3 ;

[0028] GEM=(C7+C8+C9+C10+C11+C12) / 6;

[0029] H'(t): is the distribution coefficient of Hg0 between the atmosphere and seawater.

[0030] Preferably, the purge chamber is cylindrical with a volume of 1200 ml and is made of Teflon material.

[0031] Preferably, the three-way switching valve 1 and the pipe port communicating with the purge chamber are located at the bottom of the inner cavity of the purge chamber;

[0032] The three-way switching valve 2 and the three-way switching valve 4 are connected to the purge chamber at the top of the purge chamber;

[0033] The three-way switching valve 3 and the pipe opening communicating with the purge chamber are located in the middle of the inner cavity of the purge chamber.

[0034] In summary, the present invention mainly has the following beneficial effects:

[0035] In the present invention, the monitoring device can be used for cruise or fixed station monitoring, can realize continuous and automatic monitoring of gaseous mercury, provide real-time monitoring data, and help to timely understand and grasp the concentration distribution and change trend of mercury in the environment; this method adopts auxiliary parameters to realize continuous calculation of the exchange flux of gaseous mercury at the sea-air interface;

[0036] Compared with the existing technology, this monitoring method does not require manual operation, the operation difficulty is greatly reduced, the operation requirements for personnel are low, and fast and continuous calculations can be performed in a short time;

[0037] Through high-precision monitoring, an early warning can be issued before the mercury concentration reaches a dangerous level, providing timely decision-making support for environmental protection departments and preventing mercury pollution accidents. Through the analysis of monitoring data, the source of mercury pollution can be tracked and located, providing strong evidence for environmental law enforcement and promoting effective control of pollution sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural framework diagram of the monitoring device of the present invention;

[0039] Figure 2 It is a framework diagram of the waiting state in the operation process of the monitoring device of the present invention;

[0040] Figure 3 It is a framework diagram of water sampling in the operation process of the monitoring device of the present invention;

[0041] Figure 4 It is a framework diagram of the purge analysis in the operation process of the monitoring device of the present invention;

[0042] Figure 5 It is a framework diagram of the drainage stage in the operation process of the monitoring device of the present invention;

[0043] Figure 6 The spatial distribution of dissolved gaseous mercury (DGM) in the surface seawater of the Southern Ocean in summer from January 24 to March 4, 2017 of the present invention;

[0044] Figure 7(a) The relationship between the sea-air exchange flux of gaseous mercury and the concentrations of DGM and GEM; (c) The distribution diagram of the relationship between the sea-air exchange flux of gaseous mercury and the wind speed (SPD) and the sea surface temperature (SST);

[0045] Figure 8 When analyzing the DGM of the cruise control system of the present invention, the gaseous mercury content in the purge gas is measured with a time resolution of 5 minutes.

[0046] Description of the drawings: 1. Temperature measuring instrument; 2. Water peristaltic pump; 3. Flow control meter; 4. Purge chamber; 5. Wind speed measuring instrument; 6. Drying tube 2; 7. Gaseous mercury analyzer; 8. High-pressure carrier gas bottle; 9. Zero gas generator; 10. Drying tube 1; 11. Single-chip microcomputer controller; F1. Three-way switching valve 1; F2. Three-way switching valve 2; F3. Three-way switching valve 3; F4. Three-way switching valve 4; F5. Two-way control valve. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0048] Example

[0049] like Figure 1 As shown, a device and method for continuously and automatically monitoring the flux of gaseous mercury in the sea are provided. The monitoring device comprises a purge chamber 4, which is respectively connected to a flow control meter 3, a three-way switching valve F4, a three-way switching valve F3, and a three-way switching valve F2; the output end of the flow control meter 3 is connected to a three-way switching valve F1, and the other execution ends of the three-way switching valve F1 are respectively connected to a water pumping peristaltic pump 2 and a water outlet pipe;

[0050] The other execution ends of the three-way switching valve F4 are respectively connected to the two-way control valve F5 and the exhaust pipe, and the other execution end of the two-way control valve F5 is connected to the high-pressure carrier gas bottle 8;

[0051] The other execution ends of the three-way switching valve F3 are respectively connected to the zero air generator 9 and the drain water pipe, and the other execution end of the zero air generator 9 is connected to the drying pipe 10;

[0052] The other execution ends of the three-way switching valve 2 F2 are connected to the drying pipe 2 6 and the external environment atmosphere. The wind speed measuring instrument 5 is set in the external environment atmosphere. The wind speed measuring instrument 5 measures the wind speed at the height Z as u z , unit is m / s; the other end of the drying tube 2 6 is connected to the gaseous mercury analyzer 7, and the three-way switching valve 1 F1, the three-way switching valve 2 F2, the three-way switching valve 3 F3, the three-way switching valve 4 F4 and the two-way control valve F5 are all connected to the single-chip controller 11 by telecommunication.

[0053] The gaseous mercury analyzer 7 measured a total of 6 groups of gaseous mercury concentrations in the purge gas during the purge analysis phase T3, which were C1, C2, C3, C4, C5, and C6 respectively; in phases one, two, and four, the gaseous mercury analyzer 7 detected a total of 6 groups of gaseous mercury concentrations in the external ambient atmosphere, which were C7, C8, C9, C10, C11, and C12 respectively.

[0054] The calculation formula of the thin film gas exchange model is:

[0055] F=K W (DGM-GEM / H'(t));

[0056] in,

[0057] F: is the sea-to-air flux of gaseous mercury;

[0058] K W : gas transfer rate at the water-gas interface; K W =0.31*U Z 2 (S Hg / 600)-0.5,S Hg is the Schmidt number of mercury; SHg = υ / DHg, DHg is the diffusion coefficient of mercury in seawater (cm 2 s -1 ), DHg=0.02293*exp((-17.76KJ mol -1 ) / RT), R is the gas thermodynamic constant, which is 8.314 J mol-1K-1, υ(cm 2 s -1 ) is the dynamic viscosity of seawater.

[0059] DGM: gaseous mercury dissolved in surface seawater, unit is pg / L,

[0060] DGM=(C1+C2+C3+C4+C5+C6)*10 / V;

[0061] GEM: The concentration of gaseous mercury in the external atmosphere, in ng m -3 ;

[0062] GEM=(C7+C8+C9+C10+C11+C12) / 6;

[0063] H'(t): is the distribution coefficient of Hg0 between the atmosphere and seawater, H'(t) = exp(-2404.3 / t+6.29),

[0064] The purge chamber 4 is cylindrical with a volume of 1200 ml and is made of Teflon material.

[0065] The three-way switching valve F1 and the pipe port connecting the purge chamber 4 are located at the bottom of the inner cavity of the purge chamber 4;

[0066] The three-way switching valve 2 F2 and the three-way switching valve 4 F4 are connected to the purge chamber 4 through the pipe ports located at the top of the purge chamber 4;

[0067] The pipe opening connecting the three-way switching valve F3 and the purge chamber 4 is located in the middle of the inner cavity of the purge chamber 4 .

[0068] like Figure 2 As shown, in the waiting state: three-way switching valve 1 F1, three-way switching valve 2 F2, three-way switching valve 3 F3, three-way switching valve 4 F4 and two-way control valve F5 are all in the closed state, the water pumping peristaltic pump 2 is always in the working state, the sample water is extracted from the surface seawater, and discharged from the outlet pipe, and the time is set to T1; a temperature measuring instrument 1 is set in the surface seawater to measure the surface seawater temperature E; the sample water is always in the outflow state to ensure that the sample water is updated in time.

[0069] like Figure 3 As shown, water sampling: three-way switching valve F1 and three-way switching valve F4 are in the open state, three-way switching valve F2, three-way switching valve F3, and two-way control valve F5 are all in the closed state, and the sample water is output to the inner cavity of the purge chamber 4 through the three-way switching valve F1 and the flow controller 3, and the air in the inner cavity of the purge chamber 4 is squeezed and discharged from the exhaust pipe connected to the three-way switching valve F4 to ensure the pressure balance in the purge chamber during water injection. The volume of the sample water flowing into the inner cavity of the purge chamber 4 measured by the flow controller 3 is V, in L; the time is set to T2; T2 can be appropriately adjusted according to the actual water inlet flow rate.

[0070] like Figure 4 and Figure 8 As shown, purge analysis: three-way switching valve 2 F2 and three-way switching valve 3 F3 are in the open state, three-way switching valve 1 F1, three-way switching valve 4 F4 and two-way control valve F5 are all in the closed state, dry clean air enters from the other end of drying tube 10, and enters the inner cavity of purge chamber 4 through zero gas generator 9 and three-way switching valve 3 F3 to purge the sample water body, and the purge gas directly enters the gaseous mercury analyzer 7 through three-way switching valve 2 F2 and drying tube 2 6; the time is set to T3; the flow rate is 1.0 L min -1 .

[0071] When the purge gas flow rate is 1.0Lmin -1 Analytical experiments have shown that 60 minutes is sufficient for the purge time. In fact, the purge efficiency can reach more than 90% after 30 minutes.

[0072] like Figure 5As shown, in the drainage stage: three-way switching valve 1 F1, three-way switching valve 2 F2, three-way switching valve 3 F3, and three-way switching valve 4 F4 are all in a closed state, and the two-way control valve F5 is in an open state; the high-purity argon gas in the high-pressure carrier gas bottle 8 enters the inner cavity of the purge chamber 4 through the two-way control valve F5, and discharges the sample seawater in the inner cavity of the purge chamber 4 through the outlet pipe. To ensure that the drainage is completed, the time must be set to be sufficient, and it can be judged by the high-speed argon / nitrogen gas discharge during the sweep. The time is T4, which meets the conditions of T1+T2+T3+T4=2h, T1+T2+T4=1h.

[0073] It should be noted that in this embodiment, the instrument was directly connected to the laboratory tap water system during the test phase and performed well. In the dry and wet universal laboratory on the first deck of the Xuelong ship, with the help of the Xuelong ship's own surface seawater system, the DGM continuous navigation analysis has also been actually run twice during China's 33rd and 34th Antarctic expedition routes. The focus will be on the data of the 33rd Antarctic expedition route of China passing through the Southern Ocean and the Western Indian Ocean.

[0074] During the Southern Ocean route of the 33rd Chinese Antarctic Expedition, we used a ship-based continuous analysis system to analyze the DGM of surface seawater along the route. During the austral summer, from January 24 to March 4, 2017, the DGM concentration in the Southern Ocean ranged from 5.7 to 150.7 pg L -1 ,like Figure 6 As shown, the arithmetic mean was 36.0±21.1 pg L -1 , the median value is 32.6pgL -1 The saturation of gaseous mercury in seawater is 5.8±2.7, ranging from 1.2–20.3, with an intermediate value of 5.5, and is always greater than 1, indicating that DGM in the surface seawater is in a supersaturated state and has a tendency to release mercury into the atmosphere.

[0075] Overall, the DGM concentration of this time, 36.0±21.1pg, was lower than the result of the 31st Antarctic expedition route, 23.7±13.2pg L -1 Taking into account the different routes, in fact, in the similar section between 60°E-150°E, the two results are basically similar.

[0076] Combining GEM, DGM, surface sea temperature SST and wind speed SPD, the sea-air exchange flux of gaseous mercury passing through the Southern Ocean can be calculated. Figure 7 As shown, the range is 0.0 to 25.9 ng m -2 h -1 The average value was 4.2±4.5 ng m -2 h -1 , with a median value of 3.0 ng m -2 h -1Based on this estimate, the area of ​​non-sea ice in the Southern Ocean in summer is about 1.73×1013m 2 , which will release about 157.0 tons of gaseous mercury into the atmosphere.

[0077] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.

Claims

1. A device and method for continuously and automatically monitoring the sea-air flux of gaseous mercury, characterized in that The monitoring device comprises a purge chamber (4), wherein the purge chamber (4) is respectively connected to a flow control meter (3), a three-way switching valve four (F4), a three-way switching valve three (F3), and a three-way switching valve two (F2); the output end of the flow control meter (3) is connected to a three-way switching valve one (F1), and the other execution ends of the three-way switching valve one (F1) are respectively connected to a water pumping peristaltic pump (2) and a water outlet pipe; The remaining execution ends of the three-way switching valve four (F4) are respectively connected to a two-way control valve (F5) and an exhaust pipe, and the other execution end of the two-way control valve (F5) is connected to a high-pressure carrier gas bottle (8); The remaining execution ends of the three-way switching valve three (F3) are respectively connected to a zero air generator (9) and an emptying water pipe, and the other execution end of the zero air generator (9) is connected to a drying pipe one (10); The other execution ends of the three-way switching valve 2 (F2) are respectively connected to the drying pipe 2 (6) and the external ambient atmosphere. A wind speed measuring instrument (5) is arranged in the external ambient atmosphere. The wind speed at the height Z measured by the wind speed measuring instrument (5) is u z , unit is m / s; the other end of the drying tube 2 (6) is connected to the gaseous mercury analyzer (7), and the three-way switching valve 1 (F1), the three-way switching valve 2 (F2), the three-way switching valve 3 (F3), the three-way switching valve 4 (F4) and the two-way control valve (F5) are all connected to the single-chip controller (11) by telecommunication; There are two steps: S1. Measure the data related to the sea-air flux of gaseous mercury by operating the monitoring device; the relevant data specifically include the surface seawater temperature, the volume of the sample water body, the concentration of gaseous mercury in the purge gas, and the concentration of gaseous mercury in the external ambient atmosphere; S2. By measuring relevant data and using the thin film gas exchange model to calculate the sea-air flux of gaseous mercury, the results are obtained; The operation process of the monitoring device includes the following four stages: Stage 1, waiting state: the three-way switching valve 1 (F1), the three-way switching valve 2 (F2), the three-way switching valve 3 (F3), the three-way switching valve 4 (F4) and the two-way control valve (F5) are all in the closed state, the water pumping peristaltic pump (2) is always in the working state, extracting sample water from the surface seawater and discharging it from the outlet pipe, and the time is set to T1; a temperature measuring instrument (1) is set in the surface seawater to measure the surface seawater temperature E; Stage 2, water sampling: the three-way switching valve 1 (F1) and the three-way switching valve 4 (F4) are in the open state, the three-way switching valve 2 (F2), the three-way switching valve 3 (F3), and the two-way control valve (F5) are all in the closed state, the sample water is output to the inner cavity of the purge chamber (4) through the three-way switching valve 1 (F1) and the flow controller (3), the air in the inner cavity of the purge chamber (4) is squeezed and discharged from the exhaust pipe connected to the three-way switching valve 4 (F4), and the volume of the sample water flowing into the inner cavity of the purge chamber (4) measured by the flow controller (3) is V, in L; the time is set to T2; Stage 3, purge analysis: the three-way switching valve 2 (F2) and the three-way switching valve 3 (F3) are in the open state, the three-way switching valve 1 (F1), the three-way switching valve 4 (F4) and the two-way control valve (F5) are all in the closed state, and the dry clean air enters from the other end of the drying tube 1 (10), and enters the inner cavity of the purge chamber (4) through the zero gas generator (9) and the three-way switching valve 3 (F3) to purge the sample water body, and the purge gas directly enters the gaseous mercury analyzer (7) through the three-way switching valve 2 (F2) and the drying tube 2 (6); the time is set to T3; Stage 4, drainage stage: the three-way switching valve 1 (F1), the three-way switching valve 2 (F2), the three-way switching valve 3 (F3), and the three-way switching valve 4 (F4) are all in a closed state, and the two-way control valve (F5) is in an open state; the high-purity argon gas in the high-pressure carrier gas bottle (8) enters the inner cavity of the purge chamber (4) through the two-way control valve (F5), and the sample seawater in the inner cavity of the purge chamber (4) is discharged through the outlet pipe, and the time is T4.

2. A device and method for continuously and automatically monitoring gaseous mercury sea-air flux according to claim 1, characterized in that: The T1+T2+T3+T4=2h, T1+T2+T4=1h.

3. A device and method for continuously and automatically monitoring gaseous mercury sea-air flux according to claim 1, characterized in that: The gaseous mercury analyzer (7) measures a total of 6 groups of gaseous mercury concentrations in the purge gas during the purge analysis phase T3, which are C1, C2, C3, C4, C5, and C6 respectively; in phases 1, 2, and 4, the gaseous mercury analyzer (7) detects a total of 6 groups of gaseous mercury concentrations in the external environment atmosphere, which are C7, C8, C9, C10, C11, and C12 respectively.

4. A device and method for continuously and automatically monitoring gaseous mercury sea-air flux according to claim 1, characterized in that: The calculation formula of the thin film gas exchange model is: F=K W (DGM-GEM / H’(t)); in, F: is the sea-to-air flux of gaseous mercury; K W : gas transfer rate at the water-gas interface; K W =0.31*U Z 2 (S Hg / 600)-0.5,S Hg is the Schmidt number of mercury; DGM: gaseous mercury dissolved in surface seawater, unit is pg / L, DGM=(C1+C2+C3+C4+C5+C6)*10 / V; GEM: The concentration of gaseous mercury in the external atmosphere, in ng m -3 ; GEM=(C7+C8+C9+C10+C11+C12) / 6; H'(t): is the distribution coefficient of Hg0 between the atmosphere and seawater.

5. A device and method for continuously and automatically monitoring gaseous mercury sea-air flux according to claim 1, characterized in that: The purge chamber (4) is cylindrical with a volume of 1200 ml and is made of Teflon material.

6. A device and method for continuously and automatically monitoring gaseous mercury sea-air flux according to claim 1, characterized in that: The three-way switching valve 1 (F1) and the purge chamber (4) are connected by a pipe port located at the bottom of the inner cavity of the purge chamber (4); The three-way switching valve 2 (F2) and the three-way switching valve 4 (F4) communicating with the purge chamber (4) are located at the top of the purge chamber (4); The three-way switching valve three (F3) communicating with the purge chamber (4) is located in the middle of the inner cavity of the purge chamber (4).

Images