CN117347456A - Inland water carbon dioxide partial pressure online automatic detection device and detection method thereof - Google Patents
Inland water carbon dioxide partial pressure online automatic detection device and detection method thereof Download PDFInfo
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- CN117347456A CN117347456A CN202311408713.7A CN202311408713A CN117347456A CN 117347456 A CN117347456 A CN 117347456A CN 202311408713 A CN202311408713 A CN 202311408713A CN 117347456 A CN117347456 A CN 117347456A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 238000001514 detection method Methods 0.000 title claims abstract description 51
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 37
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 37
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 8
- 238000007667 floating Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 20
- 239000000523 sample Substances 0.000 claims description 12
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 150000002500 ions Chemical class 0.000 claims description 3
- 239000006174 pH buffer Substances 0.000 claims description 3
- 239000012086 standard solution Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 30
- 230000008859 change Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 238000004177 carbon cycle Methods 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000556 factor analysis Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/302—Electrodes, e.g. test electrodes; Half-cells pH sensitive, e.g. quinhydron, antimony or hydrogen electrodes
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G01N33/182—Specific anions in water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1886—Water using probes, e.g. submersible probes, buoys
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Abstract
The invention discloses an inland water carbon dioxide partial pressure (pCO) 2 ) The on-line automatic detection device comprises a sensor (1), a sensor (2), a sensor (3), a reinforced concrete anchor point (4), a cable (5), a fixed floating ball (6), an acquisition module (7), a warning lamp (8), a signal emitter (9) and a photovoltaic panel (10); the sensor (1) is an Orion 9502BNWP carbon dioxide electrode, the sensor (2) is a PT100 temperature sensor, the sensor (3) is a pH electrode, an operator device is arranged in the acquisition module (7), and the operator device is used for calculating the acquired 3 sensor signals to obtain a carbon dioxide partial pressure (pCO) 2 ) And outputting a signal. The detection device and the detection method thereof can automatically realize fixed point and long-time sequence partial pressure (pCO) of carbon dioxide in the water body 2 ) Is convenient to use and detectsThe data accuracy is high.
Description
Technical Field
The invention relates to the field of multidisciplinary such as hydrology, water chemistry, ecology, environmental science, natural geography, global climate change and the like, in particular to an inland water carbon dioxide partial pressure (pCO) 2 ) An on-line automatic detection device and a detection method thereof.
Background
The accurate estimation of global carbon balance is critical to future sustainable development, affected by global climate change. Inland bodies of water (rivers, lakes and reservoirs) are important components of the global carbon cycle and transport and convert large amounts of carbon from natural and human activities, with some areas being vented to the atmosphere as carbon sourcesPut into CO 2 The main greenhouse gases directly affect the concentration of the greenhouse gases in the atmosphere, and the other areas are used as carbon sinks to absorb CO in the nature 2 Carbon migration deposition and burial are formed. Thus, accurate estimation of CO in inland bodies of water 2 The balance has great significance in the study of the global carbon cycle.
Currently, the partial pressure of carbon dioxide (pCO) in water 2 ) The quantitative technology mainly adopts a mobile buoyancy tank method to collect gas on site and adopts a headspace method to extract the gas after sampling, the basic principle is that the two phases of the detected substance in gas-liquid or gas-solid phase are balanced, and then an experimental instrument device (such as a gas chromatograph) is used for testing and analyzing the gas. The existing mobile buoyancy tank method (shown in figure 1) and sample headspace method (shown in figure 2) are simple and reliable methods for measuring pCO in water body 2 The mobile buoyancy tank method is a technology for carrying out on-line detection or directly extracting the upper gas for measurement by using a portable gas analyzer in a closed container, wherein the water body slowly moves in the closed container to balance the surface water body with the gas above the sealing box; in the sample headspace method, a glass bottle with a silica gel spacer cover is generally used as a closed system, a sample is filled in the closed system, a shaking table or an oscillator is shaken for a period of time, and the headspace gas is extracted after the gas in the bottle is balanced, or the dissolved gas in the water body is discharged from the headspace by utilizing the sweeping flowing gas, and the upper gas is extracted for measurement. However, the prior art has problems that both techniques require specific scientific experimental instruments such as gas chromatographs to quantitatively analyze the gas, the instruments and equipment are complex, the field operation is inconvenient, and the testing is expensive. In addition, the mobile buoyancy tank method requires that the buoyancy tank continuously moves in the surface water body to acquire non-fixed point data instead of comprehensive data of a specific moving area; when the box is slowly moved, the friction between the box and the contacted water body generates artificial turbulence or when the box wall is quickly moved, the box wall can not extend into the surface layer of the water body, and the influence of the flow velocity of the water body is overlapped, so that huge errors of balance gas in the box are caused. The sample headspace method can not well separate the dissolved gas in water sufficiently, and it is difficult to thoroughly take out the gas in the headspace after gas balance completely to measure the gas quantity; requires a specificThe purge gas is generally inert gas (such as argon and nitrogen), the required gas amount is large, the collection, storage and transportation are difficult, and the cost is high; the purge gas requires the use of special equipment, such as nitrogen blowers, which are complex and inconvenient for field sampling operations.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an inland water carbon dioxide partial pressure (pCO) 2 ) On-line automatic detection device and detection method thereof, and the detection device can automatically realize fixed-point and long-time sequence carbon dioxide partial pressure (pCO) in water body 2 ) Is detected.
Specifically, the invention is realized through the following technical schemes:
in a first aspect, the present invention provides an inland water carbon dioxide partial pressure (pCO 2 ) The on-line automatic detection device comprises a sensor (1), a sensor (2), a sensor (3), a reinforced concrete anchor point (4), a cable (5), a fixed floating ball (6), an acquisition module (7), a warning lamp (8), a signal transmitter (9) and a photovoltaic panel (10); the sensor (1), the sensor (2) and the sensor (3) are connected with the acquisition module (7), the sensor is provided with an RS485 communication interface, and signals acquired by the sensor can be uploaded to the acquisition module (7) through the RS485 communication interface; the sensor (1) is an Orion 9502BNWP carbon dioxide electrode, the sensor (2) is a PT100 temperature sensor, the sensor (3) is a pH electrode, an operator device is arranged in the acquisition module (7), and the acquisition module (7) is used for acquiring, calculating and outputting sensor signals and storing the signals or wirelessly transmitting the signals to an office PC end for storage; the operator device is used for calculating the acquired 3 sensor signals to obtain the partial pressure (pCO) 2 ) Output signal S (unit, μatm), the calculation formula is:
s in 1 Measuring the concentration of bicarbonate in the water body by the sensor (1), wherein the unit is mM/L;
S 2 the temperature of the water body measured by the sensor (2) is given by K;
S 3 the pH value of the water body is measured by a sensor (3).
Preferably, the sensor (1), the sensor (2) and the sensor (3) may be integrated together to form a multi-parameter sensor module.
Further, the partial pressure of carbon dioxide (pCO) 2 ) The on-line automatic detection device can also comprise a sensor for detecting salinity on site, and the partial pressure (pCO) of carbon dioxide is realized according to the salinity signal value improvement formula (1) 2 ) Is a detection of the presence of a sensor.
In a second aspect, the invention provides an inland water carbon dioxide partial pressure (pCO 2 ) An on-line automatic detection method having the above-mentioned inland water carbon dioxide partial pressure (pCO) 2 ) The on-line automatic detection device comprises the following steps:
(1) In the chamber, the sensor (3) is treated with pH buffer and NaHCO is treated with 3 Calibrating the sensors (1) respectively by using standard solutions;
(2) In the field, fixing the device at the position of a fixed point of a water body to be detected by using reinforced concrete anchor points, and adjusting by fixing floating balls and cables to ensure that 3 sensor probes are positioned at a position 5-10cm deep below the water surface, and supplying power to an automatic detection device by using a photovoltaic plate;
(3) The detection device utilizes the accurate temperature signal detected by the sensor (2) to automatically compensate and correct the signals of the sensor (1) and the sensor (3);
(4) The signals of the 3 sensors are collected through the collection module, and based on the chemical ion balance relation and Henry's law in the water body, the operator devices built in the collection module are used for calculating the collected signals of the 3 sensors to obtain the partial pressure (pCO) 2 ) Output signal S (unit, μatm), the calculation formula is:
s in 1 For measuring the sensor (1)The concentration of bicarbonate in the obtained water body is in mM/L;
S 2 the temperature of the water body measured by the sensor (2) is given by K;
S 3 the pH value of the water body obtained by the measurement of the sensor (3) is measured;
(5) The partial pressure of carbon dioxide (pCO) obtained by the collection module 2 ) The output signal is stored or transmitted to the office PC end for storage.
Compared with the prior art, the invention has the following beneficial effects:
(1) The carbon dioxide partial pressure (pCO) of inland water body of the invention 2 ) On-line automatic detection device and detection method thereof, and can automatically realize fixed point and long-time sequence partial pressure (pCO) of carbon dioxide in water body 2 ) Is detected.
(2) The carbon dioxide partial pressure (pCO) of inland water body of the invention 2 ) The on-line automatic detection device is convenient to use, and the detection data can be transmitted wirelessly and received by a PC.
(3) The carbon dioxide partial pressure (pCO) of inland water body of the invention 2 ) The on-line automatic detection device and the detection method thereof can not change the environmental conditions of the original water body, and the accuracy of the automatic on-line detection data is high.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a mobile buoyancy tank method.
Fig. 2 is a schematic diagram of a sample headspace method.
FIG. 3 shows the partial pressure of carbon dioxide (pCO) in a body of water according to the present invention 2 ) And (5) an online automatic detection device diagram.
Fig. 4 is a box-type statistical graph and a linear correlation comparison graph of detection data of the detection method and the headspace method-gas chromatograph of the present invention.
In the figure: the sensor 1, the sensor 2, the sensor 3, the reinforced concrete anchor point 4, the cable 5, the fixed floater 6, the collection module 7, the warning light 8, the signal transmitter 9, the photovoltaic board 10.
Detailed Description
The following detailed description of the embodiments of the present invention is provided for better illustration of the present invention, but is not to be construed as limiting the invention.
The specific techniques or conditions are not identified in the examples and are described in the literature in this field or are carried out in accordance with the product specifications.
Example 1
As shown in FIG. 3, an inland water carbon dioxide partial pressure (pCO) of the present invention 2 ) The on-line automatic detection device comprises a sensor (1), a sensor (2), a sensor (3), a reinforced concrete anchor point (4), a cable (5), a fixed floating ball (6), an acquisition module (7), a warning lamp (8), a signal transmitter (9) and a photovoltaic panel (10); the sensor (1), the sensor (2) and the sensor (3) are connected with the acquisition module (7), the sensor is provided with an RS485 communication interface, and signals acquired by the sensor can be uploaded to the acquisition module (7) through the RS485 communication interface; the sensor (1) is an Orion 9502BNWP carbon dioxide electrode and is used for rapidly measuring the concentration of bicarbonate in a water body; the sensor (2) is a PT100 temperature sensor and is used for measuring the temperature of the water body; the sensor (3) is a pH electrode and is used for measuring the pH value of the water body; an operator device is arranged in the acquisition module (7), and the acquisition module (7) is used for acquiring, calculating and outputting sensor signals and storing the signals or wirelessly transmitting the signals to an office PC (personal computer) end for storage; the operator device is used for calculating the acquired 3 sensor signals to obtain the partial pressure (pCO) 2 ) Output signal S (unit, μatm), the calculation formula is:
s in 1 Measuring the concentration of bicarbonate in the water body by the sensor (1), wherein the unit is mM/L;
S 2 the unit of the temperature of the water body measured by the sensor (2) isK；
S 3 The pH value of the water body is measured by a sensor (3).
Example 2
Partial pressure of carbon dioxide (pCO) in inland water 2 ) An on-line automatic detection method having the above-mentioned inland water carbon dioxide partial pressure (pCO) 2 ) The on-line automatic detection device comprises the following steps:
(1) In the chamber, the sensor (3) was incubated with pH buffer (2.00 mM/L, 4.01mM/L, 7.00mM/L, 9.21mM/L and 10.00 mM/L) and with NaHCO 3 The standard solutions (0.1 mM/L, 0.5mM/L, 1.0mM/L, 5.0mM/L and 10.0 mM/L) were used for calibrating the sensor (1) respectively;
(2) In the field, fixing the device at the position of a fixed point of a water body to be detected by using reinforced concrete anchor points, and adjusting by fixing floating balls and cables to ensure that 3 sensor probes are positioned at a position 5-10cm deep below the water surface, and supplying power to an automatic detection device by using a photovoltaic plate;
(3) The detection device utilizes the accurate temperature signal detected by the sensor (2) to automatically compensate and correct the signals of the sensor (1) and the sensor (3);
(4) The signals of the 3 sensors are collected through the collection module, and based on the chemical ion balance relation and Henry's law in the water body, the operator devices built in the collection module are used for calculating the collected signals of the 3 sensors to obtain the partial pressure (pCO) 2 ) Output signal S (unit, μatm), the calculation formula is:
s in 1 Measuring the concentration of bicarbonate in the water body by the sensor (1), wherein the unit is mM/L;
S 2 the temperature of the water body measured by the sensor (2) is given by K;
S 3 the pH value of the water body obtained by the measurement of the sensor (3) is measured;
(5) The partial pressure of carbon dioxide (pCO) obtained by the collection module 2 ) Output signal forThe storage or wireless transmission is carried out to the office PC end for storage.
Example 3
Evaluation of carbon dioxide partial pressure (pCO) of inland Water of the invention 2 ) On-line automatic detection device and reliability of detection method thereof
For 78 sampling points along a river, the carbon dioxide partial pressure (pCO) of the inland water body is utilized 2 ) The on-line automatic detection device acquires a signal S 1 Value of (S), signal S 2 Sum of values of (2) and signal S 3 The value, the partial pressure of carbon dioxide (pCO) in the water body is obtained through the formula (1) 2 ) The value of signal S. Meanwhile, collecting a water body sample, and performing test analysis by using a headspace method technology and an indoor instrument gas chromatograph to obtain partial pressure (pCO) of carbon dioxide in the water body 2 ) Values. Carrying out single-factor analysis of variance on the data obtained by the two technical methods, F>Fcrit, p-value 0.0356, clearly less than 0.05, indicated a significant difference between the two sets of data. The comparison result of the two methods is shown in figure 4, the data obtained by the detection device and the detection method of the invention has very strong correlation with the data obtained by the headspace method-gas chromatograph, and the correlation coefficient R 2 Reaching 0.86, indicating that the overall data change trend is consistent; however, the sample headspace method changes the original water body environment, the environmental temperature change caused by the return of a water sample container to indoor operation, and the headspace method can not well separate the dissolved gas in water fully and can not thoroughly take out the gas in the headspace after gas balance to measure the gas quantity, so that compared with the method, the data average value obtained by the sample headspace method-gas chromatograph is smaller and the change amplitude is smaller; therefore, the detection device and the detection method thereof have better representativeness and accuracy.
It is apparent that the above examples are only illustrative of the present invention and are not limiting of the embodiments of the present invention. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (4)
1. Inland water carbon dioxide partial pressure (pCO) 2 ) The on-line automatic detection device is characterized by comprising a sensor (1), a sensor (2), a sensor (3), a reinforced concrete anchor point (4), a cable (5), a fixed floating ball (6), an acquisition module (7), a warning lamp (8), a signal transmitter (9) and a photovoltaic panel (10); the sensor (1), the sensor (2) and the sensor (3) are connected with the acquisition module (7), the sensor is provided with an RS485 communication interface, and signals acquired by the sensor can be uploaded to the acquisition module (7) through the RS485 communication interface; the sensor (1) is an Orion 9502BNWP carbon dioxide electrode, the sensor (2) is a PT100 temperature sensor, the sensor (3) is a pH electrode, an operator device is arranged in the acquisition module (7), and the acquisition module (7) is used for acquiring, calculating and outputting sensor signals and storing the signals or wirelessly transmitting the signals to an office PC end for storage; the operator device is used for calculating the acquired 3 sensor signals to obtain the partial pressure (pCO) 2 ) Output signal S (unit, μatm), the calculation formula is:
s in 1 Measuring the concentration of bicarbonate in the water body by the sensor (1), wherein the unit is mM/L;
S 2 the temperature of the water body measured by the sensor (2) is given by K;
S 3 the pH value of the water body is measured by a sensor (3).
2. The on-line automatic detection device according to claim 1, characterized in that the sensor (1), the sensor (2), the sensor (3) can be integrated together to form a multi-parameter sensor module.
3. The on-line automatic detection device according to claim 1, whereinThe on-line automatic detection device can also comprise a sensor for detecting salinity on site, and the formula (1) is improved according to the salinity signal value to realize the partial pressure of carbon dioxide (pCO) 2 ) Is a detection of the presence of a sensor.
4. Inland water carbon dioxide partial pressure (pCO) 2 ) An on-line automatic detection method characterized in that the method has an inland water carbon dioxide partial pressure (pCO) as defined in any one of claims 1 to 3 2 ) The on-line automatic detection device comprises the following steps:
(1) In the chamber, the sensor (3) is treated with pH buffer and NaHCO is treated with 3 Calibrating the sensors (1) respectively by using standard solutions;
(2) In the field, fixing the device at the position of a fixed point of a water body to be detected by using reinforced concrete anchor points, and adjusting by fixing floating balls and cables to ensure that 3 sensor probes are positioned at a position 5-10cm deep below the water surface, and supplying power to an automatic detection device by using a photovoltaic plate;
(3) The detection device utilizes the accurate temperature signal detected by the sensor (2) to automatically compensate and correct the signals of the sensor (1) and the sensor (3);
(4) The signals of the 3 sensors are collected through the collection module, and based on the chemical ion balance relation and Henry's law in the water body, the operator devices built in the collection module are used for calculating the collected signals of the 3 sensors to obtain the partial pressure (pCO) 2 ) Output signal S (unit, μatm), the calculation formula is:
s in 1 Measuring the concentration of bicarbonate in the water body by the sensor (1), wherein the unit is mM/L;
S 2 the temperature of the water body measured by the sensor (2) is given by K;
S 3 the pH value of the water body obtained by the measurement of the sensor (3) is measured;
(5) Is obtained by the acquisition module pairThe partial pressure of carbon dioxide (pCO) 2 ) The output signal is stored or transmitted to the office PC end for storage.
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| CN117871793A (en) * | 2024-03-13 | 2024-04-12 | 自然资源部第二海洋研究所 | Sea-gas carbon dioxide flux estimation method considering precipitation influence |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117871793A (en) * | 2024-03-13 | 2024-04-12 | 自然资源部第二海洋研究所 | Sea-gas carbon dioxide flux estimation method considering precipitation influence |
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