氢化物原子荧光光谱法测定土壤中砷的不确定度评定

本文介绍了氢化物原子荧光光谱法测定土壤中砷的不确定度评定方法,分析和识别测定过程中不确定度的来源,归纳提出了影响土壤中砷含量测定不确定度的主要因素.通过不确定度评定证明不确定度分量的主要来源为样品制备过程所带来的不确定度,其中,消解样品所引入的不确定度贡献最大;根据最小二乘法拟合校准曲线计算的标准不确定度次之,而标准储备液校准稀释以及重复性实验所带来的不确定度相对于前两者小很多.

Evaluation of the Measurement Uncertainty for the Determination of Arsenic in Soil by Hydride Generation-Atomic Fluorescence Spectrometry

This paper introduced the evaluating method of uncertainty for determining the content of arsenic in soil by hydride generation-atomic fluorescence spectrometry.The method analyzed and distinguished the source of uncertainty in analysis process.The authors concluded the key factors of uncertainty of arsenic content measurement and important source of indefinite component are digestion sample.The evaluation indicated the uncertainty of standard curve was the second source of uncertainty.The uncertainty from standard stock solution adjusted and diluted and the repeated determination are subordinate factors.