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石墨炉原子吸收光谱法测定农业地质调查土壤样品中镉的不确定度评定
引用本文:孙爱琴,王烨,王苏明,陈爱平,陈浩凤.石墨炉原子吸收光谱法测定农业地质调查土壤样品中镉的不确定度评定[J].岩矿测试,2007,26(1):51-54.
作者姓名:孙爱琴  王烨  王苏明  陈爱平  陈浩凤
作者单位:1. 河南省地质调查院,河南,郑州,450007
2. 河南省岩石矿物测试中心,河南,郑州,450012
3. 国家地质实验测试中心,北京,100037
基金项目:国家科技基础条件平台项目--全国分析测试体系的建立与完善[FC(03-04年度)01]
摘    要:用实例对石墨炉原子吸收光谱法测定土壤样品中镉元素的不确定度进行评定,采用《测量不确定度评定与表示指南》对测量结果进行评估。分析了不确定度的主要来源,包括测量浓度的不确定度、体积的不确定度、称量不确定度及测量重复性引起的不确定度。评估了镉含量的合成标准不确定度和扩展不确定度。对于镉含量为0.42×10-6的土壤样品,其扩展不确定度为0.04×10-6。

关 键 词:不确定度评定  石墨炉原子吸收光谱法    土壤
文章编号:0254-5357(2007)01-0051-04
收稿时间:2006/1/24 0:00:00
修稿时间:2006-01-242006-05-20

Uncertainty Evaluation of Measurement Results for the Determination of Cadmium in Soil Samples by Graphite Furnace Atomic Absorption Spectrometry
SUN Ai-qin,WANG Ye,WANG Su-ming,CHEN Ai-ping,CHEN Hao-feng.Uncertainty Evaluation of Measurement Results for the Determination of Cadmium in Soil Samples by Graphite Furnace Atomic Absorption Spectrometry[J].Rock and Mineral Analysis,2007,26(1):51-54.
Authors:SUN Ai-qin  WANG Ye  WANG Su-ming  CHEN Ai-ping  CHEN Hao-feng
Institution:1. Henan Geological Survey, Zhengzhou 450007, 2. The Geoanalysis Center of Henan Province, Zhengzhou CHEN Hao-feng2 China; 450012, China; 3. National Research Center for Geoanalysis, Beijing 100037, China
Abstract:Based on , uncertainty evaluation of measurement results for the determination of cadmium in soil samples by graphite furnace atomic absorption spectrometry (GFAAS) was carried out with some examples. The results show that the main sources of the total uncertainty comes from the fraction uncertainties of sample weighting, preparation of various chemical solutions, the certified values of standard reference materials, the instrument stability and etc.. The total uncertainty for the determinations of cadmium by GFAAS was combined and the expanding uncertainty was calculated with value of 0.04×10-6 for the soil sample with cadmium content of 0.42×10-6.
Keywords:uncertainty evaluation  graphite furnace atomic absorption spectrometry  cadmium  soil
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