同位素稀释质谱法测定气体样品中微量氦氖氩

摘要: 介绍了同位素稀释质谱法（ＩＤＭＳ）定量分析地下气体样品中的微量氦氖氩。介绍了稀释剂配制、标定、稀释剂与待测样品混合和同位素比值测量技术并进行了实验结果的误差分析。结果表明：体积分数为１０￣（－６）、１０￣（－５）、１０￣（－４）时，不确定度分别约为±３％、±２％、±２％。

Abstract: DETERMINATON OF TRACE He，Ne AND Ar IN GAS SAMPLES BY IDMSZHUANG ZAIZHEN;LIU YUNNU ;CHEN HANDE ;MENG FANBEN ;JIA BAOTING（Institute of Nuclear Physics and Chemistry，China Academy of Engineering Physics，Chengdu，610003）ABSTRACT A technique of quantitative analysis of trace He、Ne and Ar in underground gas samples byisotope dilution mass spectrometry（IDMS）is presented．The procedures of diluent preparationand calibration，diluent mixing with unknown sample and the isotope ratio measurement aredescribed and the experimental uncertainties are discussed．The results show that the uncertain-ties for He、Ne and Ar are about士3％，土2％and士2％，respectively in correspondence withconcentrations of 10~(-6)、10~(-5)and 10~(-4). Key words Isotope dilution mass spectrometry He Ne Ar Underground gas samples