同位素稀释电感耦合等离子体质谱(ID-ICP-MS)测定植物与人发标准物质中的铅

Isotope Dilution Inductively Coupled Plasma Mass Spectrometery for the Determination of Lead in Plants and Human Hair

建立了同位素稀释电感耦合等离子体质谱 (ID-ICP-MS)测定铅的方法 .考察和讨论了仪器参数对同位素比值测定的影响 ,优化了仪器的数据采样参数 .利用内标 Tl对质量歧视、系统漂移进行了校正 .讨论了同位素浓缩剂加入量对最终浓度测定值的不确定度的影响 .将该方法应用于植物标准物质和人发标准物质的测定 。

A method of isotope dilution inductively coupled plasma mass spectrometry for the determination of lead in plant and human hair samples is established. The effects of instrumental parameters on the isotope ratio measurement were studied and discussed. For the precise determination, the data acquisition parameters were optimized. Tl was used as internal standard for the correction of mass bias and system driftment. The propagation of uncertainty in ID ICP MS was discussed to optimize the amount of concentrated isotope spiked. The analytical results of lead in some certificate reference materials agree well with the certificated valuesl.