地质样品Sr-Pb柱分离的可行性研究  

Feasibility study of Sr-Pb separation within a single column for geological samples

作　　者：李琳 刘希军[1,2,3] 张银慧 洪路兵 余红霞 李政林[1,2] 莫霏 时毓[1,2] LI Lin;LIU Xijun;ZHANG Yinhui;HONG Lubing;YU Hongxia;LI Zhenglin;MO Fei;SHI Yu(Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,Guilin University of Technology,Guilin 541006,Guangxi,China;Cooperative Innovation Center of non-Ferrous Mineral Exploration and Resource Efficient Utilization by Province and Ministry,Guilin University of Technology,Guilin 541006,Guangxi,China;Guangxi Science Innovation Base for Formation and Exploration of Strategic Critical Mineral Resources,Guilin University of Technology,Guilin 541006,Guangxi,China)

机构地区：[1]桂林理工大学广西隐伏金属矿产勘查重点实验室,广西桂林541006 [2]桂林理工大学有色金属矿产勘查与资源高效利用省部共建协同创新中心,广西桂林541006 [3]桂林理工大学广西战略性关键矿产资源成矿与勘查科技创新基地,广西桂林541006

出　　处：《地球化学》2024年第4期536-544,共9页Geochimica

基　　金：国家自然科学基金项目(92055208);广西科技创新基地建设类项目(桂科ZY21195031);广西八桂学者项目(2018-有色金属成矿理论与勘查技术);广西研究生教育创新计划项目(YCBZ2021093)联合资助。

摘　　要：传统的Sr-Pb同位素分析一般需要Sr和Pb单独过柱,实验流程繁琐且费时。为优化实验流程、节约实验成本和提高实验效率,本文利用1 mL的Sr特效树脂分离柱探讨了Sr-Pb柱分离的可行性。实验结果表明,Sr-Pb柱分离法具有较低的化学全流程空白(Sr<0.3 ng和Pb<1 ng)和较高的Sr-Pb回收率(>90%),且能高效分离Rb和Sr,适合不同Rb/Sr值样品的高精度同位素组成分析。不同岩性的USGS岩石标样的Sr-Pb同位素组成在误差范围内均与推荐值一致,表明本实验方法稳定可靠。Traditional Sr-Pb isotope analysis,usually performed via separating Sr and Pb in different columns,is complex and inefficient.In order to optimize experimental process,reduce cost,and improve efficiency,feasibility of Sr-Pb separation within a single column was evaluated by using 1 mL Sr-special resin separation column.Experimental results showed that the established procedure has low blank of the whole chemical procedure(Sr<0.3 ng and Pb<1 ng)and high recovery of Sr and Pb(both>90%),and can efficiently separate Rb from Sr,consequently suitable for high-precision Sr-Pb isotopic analysis of geological samples with variable Rb/Sr ratios.Analysis of different USGS standard rocks by separating Sr-Pb within a single column demonstrated that the determined Sr-Pb isotopic compositions are identical with the recommended values within uncertainty,therefore highlighting stability and reliability of this method.

关 键 词：Sr-Pb柱分离 MC-ICP-MS Sr特效树脂 淋洗曲线 

分 类 号：P595[天文地球—地球化学] O657.63[天文地球—地质学]