痕量铅的高精度同位素测量中分馏效应校正技术研究  

Calibration Technique of the Fractionation Effect in High Precision Isotopic Ratio Analysis for Trace Lead

作　　者：刘雪梅[1] 汤磊[1] 龙开明[1] 傅中华[1] 邵学鹏[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《质谱学报》2013年第5期282-287,共6页Journal of Chinese Mass Spectrometry Society

基　　金：中国工程物理研究院面上发展基金(2011B0103012)资助

摘　　要：采用经验校正(K值校正)和双稀释剂校正方法对1～50ng铅同位素标准样品进行分馏效应的校正效果比较。当样品量大于10ng时,采用传统的经验校正法,同位素比值与标称值的偏差由0.1%～0.6%减小到0.02%～0.38%;采用双稀释剂校准法,偏差由0.08%～0.45%减小到0.001%～0.14%。当样品量小于10ng时,两种校准方法未见明显效果,说明影响同位素测量准确度的因素除分馏效应外还存在其它因素。Fractionation effects were corrected by empirical （K correction） and double dilu- tion methods in isotopic measurements of 1--50 ng lead standard sample. Results showed that the relative deviations of 206Pb/204 Pb, 207Pb/204 Pb, 208Pb/204 Pb could be reduced from 0.1%--0.6% to 0.02%-0.38%for Pb sample more than 10 ng using empirical methods, and using double-dilution methods it could be reduced from 0. 08 %--0. 45 %to 0. 001% 0.14%0. But no obvious effect were detected for Pb sample less than 10 ng of two methods, which implied other facetors that affceted the precision besides fractionation effects.

关 键 词：铅同位素 分馏效应 经验校正 双稀释剂校正 

分 类 号：O657.63[理学—分析化学]