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Method for measuring dissolved methane in seawater

A determination method and dissolved state technology, applied in immunoassay, testing organic pollutants in water, testing water, etc., can solve the problems of time-consuming, concentration accuracy decline, etc., and achieve the effect of improving recovery rate and analysis rate

Active Publication Date: 2016-10-26
KOREA INST OF GEOSCI & MINERAL RESOURCES
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Problems solved by technology

However, in the case of headspace or purge-trapping, not only is it time consuming to process the sample, but the accuracy of the concentration is also reduced during the step of extracting the dissolved gas (An and Joye ,1997)
The amount of sample required for measurement is also large, requiring more than 50 to 600ml, which is the main reason why repeated experiments are difficult

Method used

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  • Method for measuring dissolved methane in seawater
  • Method for measuring dissolved methane in seawater
  • Method for measuring dissolved methane in seawater

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Embodiment 1 to 10

[0081] First, put 1ml of cadmium chloride (CdCl 2 ), sealed with a rubber stopper and an aluminum cover. Then use a vacuum pump to completely extract the air in the bottle to create a vacuum state. Then, as described above, 3 ml of the collected seawater was injected with a metered syringe, and then stored in refrigeration at 4° C. until analysis.

[0082] Then, after shaking the container at normal temperature (25° C.) for about 5 minutes, it was stored in a constant temperature and humidity chamber at 25° C. for 48 hours to allow the temperature to equilibrate. Then, after the sample is separated into dissolved gas and residue by using a methane separator, 1 ml of gas is taken from the separated dissolved gas and analyzed by a gas chromatograph. Next, in Table 1 below, parts per million (ppmv) and 1 / 1000 (μM) of millimoles (mmol) of the measured substance by gas volume are described.

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Abstract

The present invention relates to a method for measuring dissolved methane in seawater, the method comprising the steps of: a) injecting a sample into a vacuum container into which a cadmium chloride solution has been injected, followed by refrigeration; b) vibrating the container, followed by temperature equilibration with the periphery; c) passing the sample in the container through a methane separator to separate dissolved methane and residues; and d) analyzing the separated dissolved methane using a mass spectrometer. The measuring method according to the present invention has advantages of maximally raising the recovery rate of dissolved methane to increase the ratio of analysis and being able to analyze even a small amount of samples. Furthermore, in the measuring method according to the present invention, in addition to the dissolved methane measurement, sulfur isotope analysis can be also simultaneously conducted using the sample from which the dissolved methane has been extracted.

Description

technical field [0001] The invention relates to a method for measuring the concentration of dissolved methane contained in seawater, and in more detail relates to a method different from existing sample collection methods, which can maximize the recovery rate of dissolved methane, thereby improving its analysis rate, and using a small amount of samples It is also capable of analysis, and in addition to the determination of dissolved methane, it is also possible to simultaneously perform the determination method of sulfur isotope analysis in dissolved hydrogen sulfide. Background technique [0002] Methane is known to be the main culprit of the greenhouse effect 20 times higher than the equivalent amount of carbon dioxide, but it is also attracting attention as one of the important energy sources. In particular, as the main component of natural gas, methane has a large content and is suitable for use as a fuel. However, it exists in a gaseous state at room temperature and atm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/04G01N30/72G01N1/28
CPCG01N30/7206G01N2030/8854G01N1/28Y10T436/214G01N33/1826B01D61/36G01N1/2202G01N9/36G01N1/10G01N7/14G01N30/00G01N30/88G01N30/72G01N30/04G01N21/61
Inventor 金知薰崔枝宁洪性璟
Owner KOREA INST OF GEOSCI & MINERAL RESOURCES
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