飞秒激光剥蚀-多接收电感耦合等离子质谱原位微区分析青铜中铅同位素组成-以古铜钱币为例  

High-Precision In Situ Analysis of the Lead Isotopic Composition in Copper Using Femtosecond Laser Ablation MC-ICP-MS and the Application in Ancient Coins

作　　者：陈开运[1] 范超[1] 袁洪林[1] 包志安[1] 宗春蕾[1] 戴梦宁[1] 凌雪[2] 杨颖[1] 

机构地区：[1]西北大学地质学系大陆动力学国家重点实验室,陕西西安710069 [2]西北大学文化遗产学院,陕西西安710069

出　　处：《光谱学与光谱分析》2013年第5期1342-1349,共8页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(40973011);科技部国家重点实验室自主研究重点课题专项经费项目(CJ11070)资助

摘　　要：建立了飞秒激光剥蚀-多接收电感耦合等离子质谱(fLA-MC-ICPMS)铅同位素原位微区分析方法,分别利用溶液法(SN-MC-ICPMS)和激光剥蚀法(fLA-MC-ICPMS)对15个铜(黄铜,青铜)国家标准物质进行了实验分析,测试的结果表明CuPb12(GBW02137)中Pb同位素组成非常均一,可作为以铜为基体的青铜、黄铜及铜矿中Pb同位素原位微区分析的外部参考物质。对CuPb12进行了112次fLA-MC-ICPMS Pb同位素分析测试,其加权平均值与溶液法测定的Pb同位素比值在2σ误差范围内完全一致,208 Pb/204 Pb和207Pb/206Pb比值的内部精度RSE分别小于90和40ppm,外部精度RSD分别小于60和30ppm。利用本实验室建立的fLA-MC-ICPMS分析方法对13个古铜钱币中Pb同位素进行了原位微区无损伤分析,测试结果表明,不同朝代古钱币中Pb同位素组成差异较大,即使同一朝代的古钱币其Pb同位素组成也不尽相同。In the present study we set up a femtosecond laser ablation MC-ICP-MS method for lead isotopic analysis. Pb isotopic composition of fifteen copper （brass, bronze） standard samples from the National Institute of Standards Material were analyzed using the solution method （MC-ICP-MS） and laser method （fLA-MC-ICPMS） respectively, the results showed that the Pb iso- topic composition in CuPbl2 （GBW02137） is very homogeneous, and can be used as external reference material for Pb isotopic in situ analysis. On CuPbl2 112 {LA-MC-ICPMS Pb isotope analysis, the weighted average values of the Pb isotopic ratio are in good agreement with the results analyzed by bulk solution method within 20 error, the internal precision RSEs of the z08 pb/z04 Pb ratio and z07 pb/206 Pb ratio are less than 90 and 40 ppm respectively, and the external precision RSDs of them are less than 60 and 30 ppm respectively. Pb isotope of thirteen ancient bronze coins was analyzed via fLA-MC-ICPMS, the results showed that the Pb isotopic composition of ancient coins of different dynasties is significantly different, and not all the Pb isotopic compositions in the coins even from the same dynasty are in agreement with each other.

关 键 词：飞秒激光 多接收等离子质谱 PB同位素 参考物质 青铜 古钱币 

分 类 号：O657.3[理学—分析化学]