硅钼黄分光光度法测定地下水中偏硅酸的不确定度评定  

Uncertainty Evaluation for the Determination of Metasilicic Acid in Groundwater Samples by Molybdosilicate Yellow Spectrophotometry

作　　者：王亚平[1] 许春雪[1] 代阿芳[1,2] 袁建[1] 朱家平[3] 

机构地区：[1]国家地质实验测试中心,北京100037 [2]中国地质大学(武汉),湖北武汉430074 [3]中国地质调查局南京地质矿产研究所,江苏南京210016

出　　处：《岩矿测试》2010年第5期601-606,共6页Rock and Mineral Analysis

基　　金：国土资源部公益性行业科研专项经费资助(200811133);国土资源部地质大调查项目资助(1212010916020);国土资源地质大调查-地下水污染测试技术研究资助(1212010634607)

摘　　要：采用不确定度连续传递模型,对硅钼黄分光光度法测定地下水中偏硅酸(DZ/T0064.62—93)的不确定度进行评定。测量结果的不确定度主要来源于标准溶液引入的不确定度、曲线拟合产生的不确定度和测量过程引入的不确定度三部分,而二氧化硅和偏硅酸的摩尔质量不确定度较小,可以忽略不计。采用双误差回归的方式对标准曲线进行拟合,在对各个不确定度分量进行量化的基础上,通过合成得到测量结果的标准不确定度,再乘以95%置信概率下的扩展因子2,得到测量结果的扩展不确定度。The measurement uncertainty for the analytical results of H2 SiO3 in groundwater samples by molybdosilicate yellow spectrophotometry was evaluated using Continuous Propagation Model of Uncertainty.The main sources of measurement uncertainty came from sub-uncertainties of calibration solutions,calibration curve fitting and measurements.The uncertainty from molar masses of SiO2 and H2 SiO3 was ignored because of their less contribution.The double-error regression was used in the course of standard curve fitting.Based on the quantitative analysis of each source,standard uncertainty of measurement results was obtained.Then the extended uncertainty of measurement results was calculated from standard uncertainty multiplied by an extended factor of 2 （under confidence probability of 95%）.

关 键 词：不确定度评定 硅 地下水 硅钼黄分光光度法 双误差回归 

分 类 号：O213.1[理学—概率论与数理统计] O657.3[理学—数学]