ID-TIMS 准确测定国际关键比对大米粉中痕量镉  

Accurate Determination of Trace Amount of Cadmium in Rice for International Key Comparison by Isotope Dilution Thermal Ionization Mass Spectrometry

作　　者：王军[1] 赵墨田[1] 逯海[1] 

机构地区：[1]国家标准物质研究中心,北京,100013 国家标准物质研究中心,北京,100013 国家标准物质研究中心,北京,100013

出　　处：《质谱学报》2005年第z1期1-2,共2页Journal of Chinese Mass Spectrometry Society

摘　　要：The method of isotope dilution thermal ionization mass spectrometry able to trace to SI was developed to accurately measure trace amount of cadmium in the rice powder sample from CCQM-K24 international key comparison organized by CCQM(Comité Consultatif pour la Quantité de Matière, Paris). By comparison with our previous work, there was much improvement in aspects of digestion of the rice powder sample, separation of cadmium from the sample and dry-mass correction. As a result, the blank of this procedure was reduced and the measurement precisions of isotopic ratios of cadmium were increased. In addition, the uncertainty evaluation of the entire process of measurement was profoundly studied. The analytical result of this work (14.53±0.15) nmol/g was in agreement with the certified value.

关 键 词：ISOTOPE DILUTION thermal ionization mass SPECTROMETRY international comparison cadmium rice powder 

分 类 号：O657.63[理学—分析化学]