摘要
本研究建立了适用于玄武岩、纯橄岩和页岩样品的阳离子树脂铬元素化学分离方法,并采用双稀释剂校正化学分离和质谱仪测量过程中的质量分馏。在化学分离过程中铬有3个淋洗峰,反映了盐酸体系中铬至少具有3种络合物。页岩样品中Al、Ti含量较高,在淋洗过程中会有过载现象。采用了SRM 979对50Cr-54Cr双稀释剂进行了标定,双稀释剂的铬同位素组成为50Cr/52Cr=41.66,54Cr/52Cr=22.28。铬元素标准NIST 3112a相对于SRM 979的δ^53Cr=–0.063±0.05‰(2SD,N=22)。玄武岩、纯橄岩等标准物质的结果与已发表数据在误差范围内一致,精度达到国际同类实验室平均水平。
A method for high-precision isotope measurement of Cr isotope compositions using multi-collector inductively coupled plasma mass spectrometry(MC-ICP-MS)was developed.The chromium has 3 elution peaks in the purification process,implying that there exist at least 3 kinds of complex in HCl solution.The Al and Ti have a risk of overloading but no effect on the precision of Cr isotope composition in shale samples.The composition of 50Cr-54Cr double spike is determined by NIST SRM 979,50Cr/52Cr=41.66,54Cr/52Cr=22.28.The δ^53Cr of NIST 3112a is–0.063±0.05‰(2SD,N=22).The Cr isotope composition of basalt,dunite and peridotite geological reference is in agreement with the published data.
作者
马健雄
李津
陈岳龙
朱祥坤
MA Jian-xiong;LI Jin;CHEN Yue-long;ZHU Xiang-kun(MNR Key Laboratory of Isotope Geology,MNR Key Laboratory of Deep-Earth Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083)
出处
《地球学报》
EI
CAS
CSCD
北大核心
2020年第5期630-636,共7页
Acta Geoscientica Sinica
基金
国家自然科学基金项目(编号:41873027,41430104)
中国地质调查局地质调查项目(编号:DD20190002)
自然资源部深地动力学重点实验室自主研究课题(编号:J1901-20-1)
国家重点研发计划项目(编号:2019YFA0708404)联合资助。
