热电离质谱法测定岩石标准物质中Sr同位素组成  

Determination of Sr Isotopic Composition of Rock Standards by Thermal Ionisation Mass Spectrometry

作　　者：徐珺 程伟 迟乃杰 张晨西 李增胜 舒磊 单伟 李敏 孙雨沁 王秀凤 周长祥 XU Jun;CHENG Wei;CHI Naijie;ZHANG Chenxi;LI Zengsheng;SHU Lei;SHAN Wei;LI Min;SUN Yuqin;WANG Xiufeng;ZHOU Changxiang(Key Laboratory of Gold Mineralization Processes and Resource Utilization,MNR,Shandong Provincial Key Laboratory of Metallogenic Geological Process and Resource Utilization,Shandong Institute of Geological Sciences,Shandong Ji'nan 250013,China)

机构地区：[1]自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室,山东省地质科学研究院,山东济南250013

出　　处：《山东国土资源》2024年第6期28-35,共8页Shandong Land and Resources

基　　金：国家自然科学基金(42272104);中国地质调查局中国矿产地质志项目(DD20221695);山东省地质勘查项目(鲁勘字〔2022〕12号);山东省自然科学基金(ZR2019PD019);山东省自然科学基金青年项目(编号ZR2022QD050);山东省地质科学研究院开放课题资助项目(Kfjjdky202120)。

摘　　要：利用Triton XT型热电离质谱仪,对1个碳酸锶同位素标准物质SRM 987和4个岩石标准物质BCR-2、BHVO-2、JLs-1和GBW07127进行了锶(Sr)同位素比值的测试,测试时采用指数律和^(88)Sr/^(86)Sr=8.375209进行质量分馏校正,^(87)Rb/^(85)Rb=0.385041进行同质异位素干扰扣除。测得SRM 987:^(87)Sr/^(86)Sr比值为0.710252±0.000011(n=40,2SD),BCR-2:^(87)Sr/^(86)Sr比值为0.705016±0.000011(n=10,2SD)、BHVO-2:^(87)Sr/^(86)Sr比值为0.703471±0.000011(n=10,2SD),JLs-1:^(87)Sr/^(86)Sr比值为:0.707825±0.000014(n=10,2SD),与推荐值及前人文献报道值在误差范围内一致。此外,本研究测定的碳酸盐岩标准物质GBW07127的^(87)Sr/^(86)Sr比值为0.708971±0.000023(n=20,2SD),这一数据丰富了目前国家标准物质的锶同位素数据库,可为地球化学的分析研究提供重要的数据参照。The strontium isotope ratios for a carbonated strontium isotope standard SRM 987 and four rock samples BCR-2,BHVO-2,JLs-1,and GBW07127 have been determined by using the Triton XT thermal ionisation mass spectrometer provided by the Shandong Institute of Geological Sciences.To correct for mass fractionation,an exponential law with ^(88)Sr/^(86)Sr=8.375209 has been employed,while ^(87)Rb/^(85)Rb=0.385041 has been used to correct for isobaric interference.The obtained ^(87)Sr/^(86)Sr ratios for SRM 987,BCR-2,BHVO-2,and JLs-1 are 0.710252±0.000011(n=40,2SD),0.705016±0.000011(n=10,2SD),0.703471±0.000011(n=10,2SD),and 0.707825±0.000014(n=10,2SD),respectively.the results are consistent with the recommended values and the previously published literature.inthis study,we report the ^(87)Sr/^(86)Sr ratio of carbonatite standard GBW07127,which results in 0.708971+0.000023(n=20,2SD).This data enriches the current strontium isotope library of the national standard material,and it can provideimportant data references for the analytical study of geochemistry.

关 键 词：热电离质谱仪 锶同位素 岩石标准物质 质谱分析 

分 类 号：O657.63[理学—分析化学]