组合回归分析法-氢氧化钠标准滴定溶液浓度的不确定度评定

Combinatorial Measurement and Regression Analysis Methodquantifying Uncertainty for Concentration of NaOH Standard Volumetric Solutions

基于组合回归分析法的概念和方法,参照GB/T 601—2002标准,对氢氧化钠标准滴定溶液浓度的测定结果进行了不确定度评定。结果显示:当重复测定次数n=12,置信概率P=0.95时,组合回归标定结果的浓度平均值=0.104 631mol/L,标准偏差s=0mol/L,相对标准偏差RSD=0。合成标准不确定度为3.1×10-5 mol/L、扩展不确定度为6.2×10-5 mol/L。

On the basis of the concept and ways of combinatorial measurement and regression analysis method,referring to the standard of GB/T601-2002,the uncertainty of the concentration of NaOH standard volumetric solutions was quantified.The results showed when repeated measure numbers n=12,and confidence probability P=0.95, = 0.104 631 mol/L,s= 0 mol/L,RSD=0.The total measurement standard uncertainty was 3.1×10-5 mol/L,and the expanded uncertainty was 6.2×10-5 mol/L.