Calibration method for trace gas instruments in a solution

Abstract

The invention discloses a method for calibrating trace gas instruments in a solution, comprising the following steps: S100, obtaining a quantitative stock solution free of carbon dioxide, hydrogen sulfide and methane; S200, transferring the quantitative stock solution to several constant gas liquid mixing devices , set a fixed-volume fixed-volume liquid-dosing device; S300, add a standard experimental solution of known concentration to the quantitative stock solution in the fixed-gas-liquid-dosing device, and add the same Quantitative stock solution by volume, stand still; S400, measure the solution gas through the solution gas measuring device and gas chromatograph respectively; S500, calculate in turn each constant gas liquid dosing device and the constant gas liquid dosing device without secondary addition of quantitative stock liquid The difference data between them can be used to obtain the gas volume of the fixed-volume constant gas and liquid mixing device; the difference of the standard experimental solution can be used to calibrate the instrument. The systematic error generated in .

Description

technical field [0001] The invention relates to the field of natural gas calibration, in particular to a calibration method for trace gas instruments in solution. Background technique [0002] As a clean energy source in the future, natural gas hydrate is expected to replace conventional oil and gas, and has received extensive attention from governments, academic circles, and business circles around the world, including the United States, Japan, South Korea, India, and China. The abnormality of hydrocarbon gases (such as methane) and other gases (such as H2S, CO2) in seawater is one of the important identification signs for the existence of natural gas hydrates. The real-time detection of weak and abnormal gas content can provide clues and basis for the detailed investigation and exploration of hydrate resources in my country. The real-time detection method of deep-sea seawater and gas content in seawater is a frontier topic in the research of marine scientific instruments, ...

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Problems solved by technology

[0003] When preparing the fixed-value trace standard solution, the preparation method of the trace multivariate water-soluble gas standard experimental solution, the hydrate resource investigation is insufficient for the identification of the weak and abnormal signs of CH4, H2S and other gases in the seawater near the seabed, and the lack of detection of the near-seabed The in-situ multi-parameter geochemical comprehensive sensing system analyzes and tests the accuracy of trace gas content such as CH4 and H2S in seawater, and at the same time cannot remove the gas residues such as methane, carbon dioxide, hydrogen sulfide in the original solution R2, argon ambient air, etc. System errors generated during the preparation process, such as carryover, micro-syringe target gas residue, etc.

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