Chen Kai-Yun, Fan Chao, Yuan Hong-Lin, Bao Zhi-An, Zong Chun-Lei, Dai Meng-Ning, Ling Xue, Yang Ying
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2013 May;33(5):1342-9.
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 isotopic composition in CuPb12 (GBW02137) is very homogeneous, and can be used as external reference material for Pb isotopic in situ analysis. On CuPb12 112 fLA-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 2sigma error, the internal precision RSEs of the 208 Pb/204 Pb ratio and 207 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.
在本研究中，我们建立了一种用于铅同位素分析的飞秒激光烧蚀MC-ICP-MS方法。分别采用溶液法（MC-ICP-MS）和激光法（fLA-MC-ICPMS）对国家标准物质研究机构的15个铜（黄铜、青铜）标准样品的铅同位素组成进行了分析，结果表明，CuPb12（GBW02137）中的铅同位素组成非常均匀，可作为铅同位素原位分析的外部参考物质。对CuPb12进行112次fLA-MC-ICPMS铅同位素分析，铅同位素比值的加权平均值在2σ误差范围内与整体溶液法分析结果吻合良好，208Pb/204Pb比值和207Pb/206Pb比值的内部精密度RSEs分别小于90和40 ppm，其外部精密度RSDs分别小于60和30 ppm。通过fLA-MC-ICPMS对13枚古代铜钱的铅同位素进行了分析，结果表明，不同朝代古钱币的铅同位素组成存在显著差异，甚至同一朝代钱币中的铅同位素组成也并非都一致。
