重铬酸钾标定硫代硫酸钠标准溶液浓度值不确定度的评定

Quantifying Uncertainty in the Concentration of K_2Cr_2O_7 Calibrated Na_2S_2O_3 Standard Solution

重铬酸钾标定的硫代硫酸钠溶液是一种常用化学定量参比物质。文章首先以GB/T601-2002标准为依据,对重铬酸钾标定的硫代硫酸钠溶液浓度(0.1mol/L)的标定结果的不确定度进行评定。最后给出溶液浓度的合成不确定度及扩展不确定度,并对各因素影响进行分析。

The use of K2Cr2O7 calibrated Na2S2O3 standard solution is a common reagent in the physical and chemical experiments. Based on the standard of GB/T601-2002, the uncertainty in the concentration of K2Cr2O7 calibrated Na2S2O3 standard solution is firstly quantified in this paper. Finally, the compound uncertainty and expanded uncertainty of the solution concentration are given, which indicates the main contribution of different uncertainty factors.