Method for analyzing argon mass number abundance value and specific value in argon by GC-MS (gas chromatography-mass spectrometry) method

Abstract

The invention relates to a method for analyzing the argon mass number abundance value and the specific value in argon by a GC-MS (gas chromatography-mass spectrometry) method. The method comprises the following steps: (1) enabling carrier gas with the purity greater than 99.99% to pass through a purifier so as to enable the purity of the purified carrier gas to be greater than 99.999%; (2) introducing the purified carrier gas into a chromatographic column in which a to-be-detected argon sample is arranged in a gas chromatograph, deoxidizing the to-be-detected argon sample in a nickel contact agent tube after adsorption and desorption effects, and finally measuring in a mass detector so as to obtain an ion flow chromatogram and a mass spectrogram respectively; and (3) acquiring the mass number abundance values of 20Ar, 36Ar, 37Ar, 38Ar, 40Ar, 41Ar and 42Ar in argon respectively by a selected ion method according to the ion flow chromatogram and the mass spectrogram, and determining the specific value according to the relative standard deviation RSD being less than or equal to 5%. The method provided by the invention can be applied to noninvasive detection of human health, human body medical science and animal and plant research.

Description

technical field [0001] The invention relates to technical fields such as human medicine, animal and plant research, petroleum, natural gas, coal, environmental protection, etc., and in particular relates to gas chromatography-mass spectrometry analysis of argon mass abundance and ratio in argon gas. Background technique [0002] At present, mass spectrometry is mostly used to analyze the argon mass number abundance and ratio in argon gas. The method is to put the argon gas sample into the sample storage tank, and infiltrate the mass spectrometer through a very thin capillary tube to analyze the argon mass number abundance value in argon gas. and ratio. However, no matter how pure the argon gas sample is, it still has impurities. When the argon gas sample and impurities are analyzed by mass spectrometry at the same time, the fragment mass abundance value in the impurity will be superimposed on the argon abundance value in the argon gas sample, making it Difficult to judge, r...

AI Technical Summary

Problems solved by technology

However, no matter how pure the argon gas sample is, it still has impurities. When the argon gas sample and impurities are analyzed by mass spectrometry at the same time, the fragment mass abundance value in the impurity will be superimposed on the argon abundance value in the argon gas sample, making it Difficult to judge, resulting in an error between the true argon mass abundance value and the ratio

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