Geochemical multi-parameter field online monitoring system

Abstract

The utility model relates to a geochemical multi-parameter field online monitoring system, which comprises a gas taking unit, a gas transmission unit, a monitoring unit and a data remote transmission unit, the gas taking unit, the gas transmission unit and the monitoring unit are sequentially connected through a gas pipeline, and the monitoring unit is in communication connection with the data remote transmission unit; the gas transmission unit comprises an enrichment fractionation pipe, a three-way electromagnetic valve, a residual liquid bottle and a hydraulic water-sealed tank, a gas outlet of the gas taking unit is sequentially connected with the enrichment fractionation pipe and a public port of the three-way electromagnetic valve, a first gas outlet of the three-way electromagnetic valve is connected with the residual liquid bottle, and a gas outlet of the residual liquid bottle is connected with a gas inlet of the monitoring unit; and a second air outlet of the three-way electromagnetic valve is connected with the hydraulic water-sealed tank. The geochemical multi-parameter field on-line monitoring system has the characteristics of automatic gas taking, real-time analysis and remote transmission, integrates sampling, analysis, power supply, lightning protection and data communication, and is high in integration degree, free of manual operation and small in analysis interference error.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of gas geochemistry analysis technology, specifically relates to a kind of geochemistry multi-parameter field online monitoring system. BACKGROUND

[0002] The gas in the earth interior is the most sensitive fluid substance in the geochemical field and has the strongest migration, which can directly carry the information of the deep earth to the surface; therefore, a large amount of information of the deep earth is released to the surface during the crustal activity, and the crustal activity can be judged by monitoring the surface gas. However, the release of the deep crustal gas is usually in the form of small scale and low speed, which is difficult to capture effectively, but the underground gas can be effectively observed on some main escape channels of the fracture zone. The hot spring, volcano and fault fracture zone are one of the underground gas escape channels, therefore, the gas escaped from the hot spring, volcano and fracture zone is a good indicator of the fracture activity.

[0003] An important means of studying gas geochemistry is the rare gas geochemistry method. The rare gases closely related to the crustal activity and relatively sensitive include H2, He, CO2, CH4, Hg, Rn, etc. Studies have shown that these gases may have obvious anomalies before or after an earthquake, therefore, monitoring the gas escaped from the fracture zone can monitor the crustal activity and further monitor the process of earthquake preparation and occurrence.

[0004] In the prior art, the observation method for studying the relationship between gas geochemistry and crustal activity is to use a 500 mL glass bottle to collect gas by drainage gas collection method or to use a soil gas collection device to collect gas by enrichment and then load the collected gas into a sampling bag, which is taken back to the laboratory for gas concentration analysis by micro gas mass spectrometer or gas chromatograph. This intermittent manual sampling and analysis method has obvious earthquake reflection effect in the long-term observation of multiple fracture zones, but the analysis has a lag due to the intermittent sampling, and some small and medium earthquake activities may be missed. In addition, the manual interference factor is large during sampling, so that some gases with high solubility or fast escape are affected by air, and the analysis error is large. UTILITY MODEL CONTENT

[0005] In view of the above shortcomings and deficiencies in the prior art, one of the purposes of the utility model is to solve at least one or more of the above problems in the prior art, in other words, one of the purposes of the utility model is to provide a geochemistry multi-parameter field online monitoring system which meets one or more of the above needs.

[0006] In order to achieve the above utility model purposes, the utility model adopts the following technical solutions:

[0007] A geochemical multi-parameter field online monitoring system includes a gas extraction unit, a gas transmission unit, a monitoring unit and a data remote transmission unit, wherein the gas extraction unit, the gas transmission unit and the monitoring unit are connected in sequence through a gas pipeline, and the monitoring unit is communicatively connected to the data remote transmission unit;

[0008] Among them, the gas transmission unit includes an enrichment and distillation tube, a three-way solenoid valve, a residual liquid bottle and a hydraulic water seal tank. The gas outlet of the gas extraction unit is connected to the enrichment and distillation tube and the common port of the three-way solenoid valve in sequence. The first gas outlet of the three-way solenoid valve is connected to the residual liquid bottle, the gas outlet of the residual liquid bottle is connected to the gas inlet of the monitoring unit, and the second gas outlet of the three-way solenoid valve is connected to the hydraulic water seal tank.

[0009] As a preferred embodiment, the enrichment and fractionation pipe includes a vertical pipe and an inclined pipe. The bottom of the vertical pipe is connected to the gas extraction unit, and the top is connected to the inclined pipe. The inner wall of the vertical pipe is staggered with cooling bosses from bottom to top. The cooling bosses are cone-shaped, and their cone tips point to the radial center of the vertical pipe.

[0010] The sloped tube includes an upwardly inclined section and a downwardly inclined section extending therefrom. The bottom end of the upwardly inclined section is connected to the top of the vertical tube, and the bottom end of the downwardly inclined section is connected to the common port of the three-way solenoid valve.

[0011] As a preferred solution, the slope of the upward inclined section is 15 to 75°, and the slope of the downward inclined section is 30 to 60°.

[0012] As a preferred solution, the residual liquid bottle includes a first-stage gas-water separation bottle and a second-stage automatic drainage bottle. The water outlet of the first-stage gas-water separation bottle is higher than the water inlet of the second-stage automatic drainage bottle. The inlet of the first-stage gas-water separation bottle is connected to the first gas outlet of the three-way solenoid valve, the gas outlet is connected to the monitoring unit, and the water outlet is connected to the water inlet of the second-stage automatic drainage bottle. The water outlet of the second-stage automatic drainage bottle is naturally emptied.

[0013] As a preferred solution, the monitoring unit includes a multi-component separation column, a steady flow pump and a multi-parameter sensing detection module connected in sequence, the air inlet of the multi-component separation column is connected to the air outlet of the residual liquid bottle, the multi-parameter sensing detection module is electrically connected to the signal analysis circuit, and the signal analysis circuit communication serial port is connected to the data remote transmission unit.

[0014] As a preferred embodiment, the multi-component separation column is a micro-chromatographic column based on the principle of gas chromatography, which is used to perform chromatographic separation of H2, He, CO2, CH4, and Hg in the crustal gas;

[0015] Among them, the filling medium of the multi-component separation column is a wood porous carbon-based material, the length of the separation column is not less than 3 meters, the inner diameter is 0.5 to 3 mm, and the pore size is 3 to 10 μm.

[0016] As a preferred solution, the multi-parameter sensing detection module comprises a gas detection sensor, an ambient temperature sensor, an air pressure sensor and a sample temperature sensor.

[0017] The gas detection sensor comprises a thermal conductivity sensor, an infrared spectrum sensor and a thin film type gas sensitive sensor, and the gas sequentially passes through the thermal conductivity sensor, the infrared spectrum sensor and the thin film gas sensitive array sensor.

[0018] As a preferred solution, the gas taking unit adopts a sunken gas collecting cover.

[0019] As a preferred solution, the geochemical multi-parameter field online monitoring system further comprises an uninterrupted power supply unit and a lightning protection unit for power supply and lightning protection during continuous operation of the online monitoring system.

[0020] As a preferred solution, the volume of the hydraulic water seal tank is not less than 5L.

[0021] Compared with the prior art, the geochemical multi-parameter field online monitoring system has the beneficial effects that:

[0022] The geochemical multi-parameter field online monitoring system has the characteristics of automatic gas taking, real-time analysis and remote transmission, integrates sampling-analysis-power supply-lightning protection-data communication, has a high degree of integration, does not need manual operation and has small analysis interference error. The geochemical multi-parameter field online monitoring system adopts a sunken in-situ natural gas taking mode, uses automatic gas transmission and analysis technology, realizes automatic sampling-continuous online analysis of hot spring or soil gas, realizes real-time data transmission during analysis, meets the needs of real-time monitoring of crustal activity, automatically takes, transmits and discharges gas, does not need manual operation, can guarantee real-time analysis of gas, greatly improves the frequency of earthquake monitoring, reduces the time and error of manual sampling analysis, upgrades manual analysis to automatic analysis, perfects the existing geochemical analysis method, provides more accurate and detailed data for research on crustal activity. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a framework diagram of the geochemical multi-parameter field online monitoring system of the hot spring well of the embodiment 1 of the utility model;

[0024] Figure 2 is a structural schematic view of the enrichment fractionation pipe of the embodiment 1 of the utility model;

[0025] Figure 3 is the framework diagram of the soil well geochemistry multi-parameter field online monitoring system of embodiment 1 of the present application. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the embodiments of the present application, the specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor, and other embodiments can also be obtained.

[0027] Embodiment 1:

[0028] As shown in the drawings, Figure 1 The hot spring well geochemistry multi-parameter field online monitoring system of the present embodiment includes a gas taking unit 1, a gas transmission unit, a monitoring unit 3, a data remote transmission unit 4, an uninterrupted power supply unit 5 and a lightning protection unit. The gas taking unit 1, the gas transmission unit and the monitoring unit 3 are connected in sequence by a gas pipeline. The monitoring unit 3 and the data remote transmission unit 4 are connected by a communication serial port. The uninterrupted power supply unit 5 is electrically connected to the gas transmission unit 2, the monitoring unit 3 and the data remote transmission unit 4 in sequence. The lightning protection unit is embedded in the monitoring unit 3, the data remote transmission unit 4 and the uninterrupted power supply unit 5.

[0029] Specifically, the gas taking unit 1 is a submerged gas collector, which is installed in the area where the gas bubbles concentrate in the hot spring well 0. The material is stainless steel, and the surface is coated with a polytetrafluoroethylene film with a thickness of not less than 3mm. The gas collector is cylindrical with an internal hollow, and the height is not less than 10cm. The diameter of the cylinder is determined according to the diffusion area of the hot spring bubbles or the diameter of the soil gas collection well. The top is centrally perforated with a hole diameter of not less than 5cm, and the circular arc angle is connected to the gas transmission unit 2. When the gas taking unit of the hot spring well is installed, it is completely immersed in the hot spring water, and the best depth is 0.5-1.5m below the hot spring well, so as to ensure that the gas taking unit is completely isolated from air through a certain thickness of water, so that the gas collected by the gas taking unit is only the escaped gas of the fracture zone.

[0030] The gas transmission unit of the present embodiment includes an enrichment fractionation pipe 2-1, a three-way electromagnetic valve 2-2, a residual liquid bottle 2-3 and a hydraulic water seal tank 2-4. The gas outlet of the gas taking unit is connected in sequence to the common port of the enrichment fractionation pipe 2-1 and the three-way electromagnetic valve 2-2. The first gas outlet of the three-way electromagnetic valve 2-2 is connected to the residual liquid bottle 2-3, the gas outlet of the residual liquid bottle is connected to the gas inlet of the monitoring unit 3, and the second gas outlet of the three-way electromagnetic valve is connected to the hydraulic water seal tank 2-4.

[0031] Further, as shown in the drawings, Figure 2As shown, the enrichment fractionation pipe 2-1 includes a vertical pipe 21a and an inclined pipe, the bottom of the vertical pipe 21a is connected to the gas taking unit 1, the top is connected to the inclined pipe, the inside of the vertical pipe is distributed with cooling bosses 200 from bottom to top, the cooling bosses 200 are conical structures, the tips of the cones point to the radial center of the vertical pipe; one section of the inclined pipe is upwardly inclined to form an upwardly inclined section 21b, the angle is between 15° and 75°, the other section is downwardly inclined to form a downwardly inclined section 21c connected to the three-way electromagnetic valve 2-2, the angle is between 30° and 60°. The enrichment fractionation pipe 2-1 of the embodiment can effectively collect the gas of the gas taking unit, and at the same time, utilize the temperature difference between the top and bottom of the vertical pipe and the conical condensation of the cooling bosses to condense the water vapor in the gas, so that when the gas passes through the inclined pipe, it flows back to the liquid surface of the gas taking unit through the upwardly inclined section 21b, and the effect of gas-liquid fractionation is achieved.

[0032] The residual liquid bottle 2-3 of the embodiment includes a first-stage gas-water separation bottle 23a and a second-stage automatic drainage bottle 23b, the water outlet of the first-stage gas-water separation bottle is higher than the water inlet of the second-stage automatic drainage bottle, the inlet of the first-stage gas-water separation bottle is connected to the first gas outlet of the three-way electromagnetic valve 2-2, the gas outlet is connected to the monitoring unit, the water outlet is connected to the water inlet of the second-stage automatic drainage bottle, and the water outlet of the second-stage automatic drainage bottle is naturally drained.

[0033] The inlet of the hydraulic water seal tank 2-4 is connected to the second gas outlet of the three-way electromagnetic valve 2-2, and the pipe is immersed in the bottom of the hydraulic water seal tank, the volume of the hydraulic water seal tank is not less than 5L, and the volume of the hydraulic water seal tank is set according to the size of the gas escape flow, and the gas outlet is naturally drained.

[0034] The monitoring unit 3 of the embodiment includes a multi-component separation column 3-1, a constant flow pump 3-2, a multi-parameter sensing detection module 3-3, and a signal analysis circuit, the gas transmission unit is connected to the multi-component separation column, the constant flow pump and the multi-parameter sensing detection module in sequence, the multi-parameter sensing detection module is electrically connected to the signal analysis circuit, and the signal analysis circuit is electrically connected to the data remote transmission unit; wherein the constant flow pump extracts the escaped gas at a constant flow rate, so that the gas slowly and uniformly passes through the multi-component separation column.

[0035] The above multi-component separation column 3-1 is a miniature chromatographic column based on the principle of gas chromatography, and is used for chromatographic separation of H2, He, CO2, CH4 and Hg in the crust escaped gas. The filling medium of the multi-component separation column is a wooden porous carbon-based material, the length of the separation column is not less than 3 meters, the inner diameter is 0.5-3mm, the pore size distribution is 3-10μm, and when the gas passes through the multi-component separation column, the different viscosity strengths of the active bonds of each gas component and the porous carbon-based surface cause the separation of each component of the gas in a short time sequence.

[0036] The multi-parameter sensing detection module of the embodiment comprises a gas detection sensor, an ambient temperature sensor, a barometric pressure sensor and a sample temperature sensor. The gas detection sensor comprises three levels of sensors. The first level sensor is a thermal conductivity sensor, the second level sensor is an infrared spectrum sensor, and the third level sensor is a thin film gas sensitive array sensor. The gases pass through the first level thermal conductivity sensor, the second level infrared spectrum sensor and the third level thin film gas sensitive sensor in sequence. The thermal conductivity sensor measures the concentrations of H2, He, CO2, CH4 and Hg in the escaping gas. The infrared spectrum sensor mainly measures the concentrations of CO2 and CH4, and is used to broaden the detection range of the gas concentration. The third level sensor is used to improve the sensitivity of the sensor by fine measurement according to the response objects of various gas sensitive sensors. Specifically, the third level thin film gas sensitive sensor has hydrogen sensitive thin films, methane gas sensitive sensors, carbon dioxide gas sensitive sensors and mercury gas sensitive sensors distributed in parallel in the gas chamber. The hydrogen sensitive thin films are palladium-doped tin oxide thin films, the methane gas sensitive sensors are platinum-doped vanadium oxide thin films, the carbon dioxide gas sensitive sensors are perovskite PrFeO3 nanoparticle-doped tin oxide thin films, and the mercury gas sensitive sensors are nano gold thin films.

[0037] Further, the signal analysis circuit is connected to the multi-parameter sensing detection module, and is used to receive the transient response signals output by the third level sensor array group, and perform sample recognition and clustering comparison on the signals, output the concentration values of the gases, and transmit the concentration values to the data remote transmission unit. The signal analysis circuit sequentially recognizes the characteristic peaks output by the thermal conductivity sensor, the intensity output by the infrared non-dispersive sensor (i.e. the infrared spectrum sensor), and then recognizes the characteristic signals output by the gas sensitive thin film sensors. The signal analysis circuit performs clustering comparison on the characteristic signals of the gas sensitive thin film sensors and the characteristic peak height output by the corresponding thermal conductivity sensor or the intensity output by the infrared non-dispersive sensor, and outputs a complete set of values, i.e. obtains the concentration values of the gases. The above signal analysis circuit can refer to the prior art, and will not be described here.

[0038] The data remote transmission unit of the embodiment is a data transmission module based on network communication, and is used to transmit the measurement point detection results to the user monitoring end in real time. The data remote transmission unit collects the data output by the monitoring unit by using an ARM as a kernel of a high-performance processor, and realizes point-to-point communication by using a data communication protocol of ultra-high frequency radio frequency identification and a spread spectrum communication data transmission technology.

[0039] The geochemical multi-parameter field online monitoring system of the embodiment is provided with an uninterrupted power supply unit to realize power supply for continuous online real-time measurement, and a large-capacity storage battery or solar energy, wind energy and other direct current power supply is used to provide supplemental power. In order to ensure safe operation, a two-stage lightning protection module is arranged on the power supply unit, the monitoring unit and the data remote transmission unit. The first stage lightning protection is located in the power supply unit and comprises a lightning protection ground net and a lightning surge protector. The second stage lightning protection is located on the circuit of the monitoring unit and the data remote transmission unit, and an electric surge protector and an overvoltage protector are arranged.

[0040] The monitoring method based on the geochemical multi-parameter field online monitoring system comprises the following processes:

[0041] The gas taking unit is placed in the area where bubbles are concentrated in the hot spring well, and the gas taking unit is completely immersed in the area below the water surface. The gas taking unit is sealed by hot spring water, so that the gas taking unit is completely isolated from the air on the ground. The gas transmission unit transmits the gas collected by the gas taking unit to the monitoring unit or the air. The steady flow pump in the monitoring unit works regularly. When the steady flow pump works, the three-way electromagnetic valve of the gas transmission unit is connected to the first gas outlet. After the excess hot spring liquid or condensed water is discharged through the gas outlet of the excess liquid bottle, it enters the monitoring unit. The monitoring unit analyzes the concentration of each component after multi-component separation, and transmits the analysis result to the data remote unit. The data remote unit outputs the result to the user monitoring end. When the steady flow pump in the monitoring unit stops working, the three-way electromagnetic valve of the gas transmission unit is connected to the second gas outlet. The gas collected by the gas taking unit is discharged to the air through the hydraulic water seal tank, so as to prevent the accumulation of gas in the gas taking unit to form a positive pressure cavity, causing the escape gas channel to be blocked, resulting in delayed gas update or lowering the water level to cause the gas taking unit to be exposed to the air.

[0042] Embodiment 2:

[0043] The soil well geochemical multi-parameter field online monitoring system of the present embodiment is different from that of embodiment 1 in that the environment monitored by the online monitoring system is different, and the framework of the system remains the same as that of embodiment 1.

[0044] Specifically, as shown in Figure 3 The gas taking unit 1 is placed in the area where bubbles are concentrated in the soil well 0', and is immersed in the area below the shallow soil layer 3 meters, so as to ensure that the gas taking unit is completely isolated from the air by a certain thickness of soil, so that the gas collected by the gas taking unit is only the escape gas of the fracture zone.

[0045] The other structures can refer to embodiment 1.

[0046] Correspondingly, the monitoring method of the soil well geochemical multi-parameter field online monitoring system of the present embodiment comprises the following processes:

[0047] The gas taking unit is placed in the area below 3 meters of the soil surface layer, and is ensured to be completely immersed in the area below 3 meters of the soil surface layer, the gas taking unit is sealed by the soil, so that the gas taking unit is completely isolated from the air on the ground; the gas transmission unit transmits the gas collected by the gas taking unit to the monitoring unit or the air, the steady flow pump in the monitoring unit works regularly, when working, the three-way electromagnetic valve of the gas transmission unit is connected with the first gas outlet, after the excess hot spring liquid or condensed water is discharged through the gas outlet of the excess liquid bottle, the gas enters the monitoring unit, the monitoring unit analyzes the concentration of each component after multi-component separation, and transmits the analysis result to the data remote unit, and the data remote unit is output to the user monitoring end; when the steady flow pump of the monitoring unit stops working, the three-way electromagnetic valve of the gas transmission unit is connected with the second gas outlet, the gas collected by the gas taking unit is discharged to the air through the hydraulic water seal tank, so as to prevent the gas in the gas taking unit from accumulating to form a positive pressure cavity, causing the escape gas channel to be blocked, causing the gas to be not updated in time or the water level to be lowered, causing the gas taking unit to be exposed to the air.

[0048] The preferred embodiments and principles of the present application are described in detail above, and for ordinary skilled persons in the art, according to the idea provided by the present application, the specific implementation manner can be changed, and these changes should be regarded as the protection scope of the present application.

Claims

1. A geochemical multi-parameter field on-line monitoring system, characterized in that, The earth chemical multi-parameter field online monitoring system comprises a gas taking unit, a gas transmission unit, a monitoring unit and a data remote transmission unit, the gas taking unit, the gas transmission unit and the monitoring unit are sequentially connected through a gas pipeline, and the monitoring unit is in communication connection with the data remote transmission unit. The gas transmission unit comprises an enrichment and fractionation pipe, a three-way electromagnetic valve, a residual liquid bottle and a hydraulic water seal tank, the gas outlet of the gas taking unit is sequentially connected with the common port of the enrichment and fractionation pipe and the three-way electromagnetic valve, the first gas outlet of the three-way electromagnetic valve is connected with the residual liquid bottle, the gas outlet of the residual liquid bottle is connected with the gas inlet of the monitoring unit, and the second gas outlet of the three-way electromagnetic valve is connected with the hydraulic water seal tank.

2. The geochemical multi-parameter field on-line monitoring system according to claim 1, characterized in that, The enrichment and fractionation pipe comprises a vertical pipe and an inclined pipe, the bottom of the vertical pipe is connected with the gas taking unit, the top of the vertical pipe is connected with the inclined pipe, the inner wall of the vertical pipe is distributed with cooling bosses in a staggered manner from bottom to top, the cooling bosses are in a conical structure, and the tips of the cooling bosses point to the radial center of the vertical pipe. The inclined pipe comprises an upward inclined section and a downward inclined section extended from the upward inclined section, the bottom end of the upward inclined section is connected with the top of the vertical pipe, and the bottom end of the downward inclined section is connected with the common port of the three-way electromagnetic valve.

3. The geochemical multi-parameter field on-line monitoring system according to claim 2, characterized in that, The inclination of the upward inclined section is 15-75°, and the inclination of the downward inclined section is 30-60°.

4. The geochemical multi-parameter field on-line monitoring system according to any one of claims 1-3, characterized in that, The residual liquid bottle comprises a first-stage gas-water separation bottle and a second-stage automatic water drainage bottle, the water outlet of the first-stage gas-water separation bottle is higher than the water inlet of the second-stage automatic water drainage bottle, the inlet of the first-stage gas-water separation bottle is connected with the first gas outlet of the three-way electromagnetic valve, the gas outlet is connected with the monitoring unit, the water outlet is connected with the water inlet of the second-stage automatic water drainage bottle, and the water outlet of the second-stage automatic water drainage bottle is naturally drained.

5. The geochemical multi-parameter field on-line monitoring system according to any one of claims 1-3, characterized in that, The monitoring unit comprises a multi-component separation column, a steady flow pump and a multi-parameter sensing detection module which are sequentially connected, the gas inlet of the multi-component separation column is connected with the gas outlet of the residual liquid bottle, the multi-parameter sensing detection module is electrically connected with a signal analysis circuit, and the signal analysis circuit is in communication connection with the data remote transmission unit through a communication serial port.

6. The geochemical multi-parameter field on-line monitoring system according to claim 5, characterized in that, The multi-component separation column is a micro chromatographic column based on the principle of gas chromatography and is used for chromatographic separation of H2, He, CO2, CH4 and Hg in crust outgassing. The filling medium of the multi-component separation column is a wooden porous carbon-based material, the length of the separation column is not less than 3 m, the inner diameter is 0.5-3 mm, and the pore size is 3-10 μm.

7. The geochemical multi-parameter field on-line monitoring system according to claim 5, characterized in that, The multi-parameter sensing detection module comprises a gas detection sensor, an ambient temperature sensor, an air pressure sensor and a sample temperature sensor. The gas detection sensor comprises a thermal conductivity sensor, an infrared spectrum sensor and a thin film gas sensitive sensor, and the gas sequentially passes through the thermal conductivity sensor, the infrared spectrum sensor and the thin film gas sensitive sensor; the gas chamber of the thin film gas sensitive sensor is parallelly distributed with a hydrogen sensitive thin film, a methane gas sensitive sensor, a carbon dioxide gas sensitive sensor and a mercury gas sensitive sensor, the hydrogen sensitive thin film is a palladium-doped tin oxide thin film, the methane gas sensitive sensor is a platinum-doped vanadium oxide thin film, the carbon dioxide gas sensitive sensor is a perovskite PrFeO3 nanoparticle-doped tin oxide thin film, and the mercury gas sensitive sensor is a nano gold thin film.

8. The geochemical multi-parameter field on-line monitoring system according to any one of claims 1-3, characterized in that, The gas taking unit adopts a sunken gas collecting hood.

9. The geochemical multi-parameter field on-line monitoring system according to any one of claims 1-3, characterized in that, The gas taking unit adopts a sunken gas collecting hood. The earth chemical multi-parameter field online monitoring system further comprises an uninterrupted power supply unit and a lightning protection unit for power supply and lightning protection during continuous operation of the online monitoring system.

10. The geochemical multi-parameter field on-line monitoring system according to any one of claims 1-3, characterized in that, The hydraulic water seal tank volume is not less than 5L. The hydraulic water seal tank volume is not less than 5L.

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