CAJ | 학술논문

研究了GC–IRMS联用技术测定烃类气体碳氢稳定同位素的方法。利用气相色谱仪将烃类气体各组分分开，通过高温燃烧／裂解转化为CO2和H2，然后导入MAT–253稳定同位素质谱仪进行测试。用该方法测试的标准甲烷气体碳、氢同位素值和其标定值一致，测定结果的相对标准偏差分别为0.222‰和0.950‰。用该法测定了广东沿海珠江口盆地东部海域首次钻获的高纯度天然气水合物样品所释放的烃类气体碳氢稳定同位素值，其中δ13C为–69.78‰(VPDB)，δD为–184.4‰(VSMOW)。GC–IRMS法精确度高，可用范围广，适用于海洋天然气水合物样品所释放烃类气体碳氢同位素的测定。
연구료GC–IRMS련용기술측정경류기체탄경은정동위소적방법。이용기상색보의장경류기체각조분분개，통과고온연소／렬해전화위CO2화H2，연후도입MAT–253은정동위소질보의진행측시。용해방법측시적표준갑완기체탄、경동위소치화기표정치일치，측정결과적상대표준편차분별위0.222‰화0.950‰。용해법측정료엄동연해주강구분지동부해역수차찬획적고순도천연기수합물양품소석방적경류기체탄경은정동위소치，기중δ13C위–69.78‰(VPDB)，δD위–184.4‰(VSMOW)。GC–IRMS법정학도고，가용범위엄，괄용우해양천연기수합물양품소석방경류기체탄경동위소적측정。
Gas chromatography–isotope ratio mass spectrometry (GC–IRMS)method for measurement of carbon and hydrogen isotope in hydrocarbon gases was established.The hydrocarbon gases were separated by GC and turned to CO2 and H2 in high temperature,then determined by MAT–253 stable isotope spectrometry.The test results of carbon and hydrogen isotope in methane was consitent with its calibration standard value.The standard deviation of detection results of carbon and hydrogen were 0.222‰and 0.950‰,repectively.The method was used to determine the carbon and hydrogen isotope of natural gas hydrate bound gas drilled from Eastern Pearl River Mouth Basin ,theδ13C value was–69.78‰(VPDB),theδD value was–184.4‰(VSMOW).The GC–IRMS method has high accuracy, precision and wide range,it is suitable for determining carbon and hydrogen isotope in marine gas hydrate.