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水中砷的原子荧光光谱测定结果的不确定度评定
谢勇坚
(
广东省肇庆市自来水公司, 广东肇庆 526020)摘要: 目的对原子荧光光谱法测定水中砷含量的不确定度来源及其对测量不确定度的影响进行分析。方法利用相对标准不确定度进行测量不确定度的评定。过程采用直观的因果图, 建立有效的数学模型, 利用相对标准不确定度分量进行测量不确定度评定, 并在砷含量为117μg/L的水样测定中, 获得其相对标准不确定度为314% , 有效自由度为25。结论原子荧光光谱法对水中砷浓度测量不确定度影响因素中, 工作曲线拟合产生的不确定度较大。
关 键 词
: 原子荧光光谱法; 砷; 测量不确定度; 评定中图分类号
: X83012 文献标识码:A 文章编号: 100123644 (2007) 0220055204Eva lua tion of Uncerta in ty in Determ ina tion of Arsen ic in Wa ter by Atom ic Fluorescence Spectrometry
XIE Yong
2jian( Zhaoqing City W ater Supply Co. , Zhaoqing, Guangdong Province 526020, China)
Abstract: Objective To study the sources and influences of uncertainty in determination of water arsenic1Method Using the related standard uncertainty to evaluate uncertainty in measurement1Process Making use of the cause and effect diagram to analyse uncertainty, the mathematical model of the related standard uncertainty was established which consists of terms of uncertainty component and a result of related standard uncertainty 314% and degrees of freedom 25 were obtained in determination of a water samp le with arsenic 117μg/L1Conclusion In the influence factors of uncertainty in determination of water arsenic by atomic fluorescence spectrometry, the uncertainty of curve fitting ismore1
Keywords: Atomic fluorescence spectrometry; arsenic; uncertainty ofmeasurement; evaluation