芥子气纯度测定不确定度分析与评定

采用酸碱滴定法测定芥子气纯度,对测量结果的不确定度进行评定。分析了测定过程中不确定度来源,包括滴定剂的标定、消耗滴定剂体积、样品称量等引入的不确定度及其计算方法,最后合成得到标准不确定度。当芥子气纯度测定结果为94.78%时,扩展不确定度为0.34%(k=2)。实验结果表明,样品称量引入的不确定度对测量结果的影响最大。

Uncertainty analysis and evaluation for purity determination of sulfur mustard

A method was developed for determining the purity of sulfur mustard by acid-base titration and the uncertainty of determination result was evaluated.The sources of uncertainty produced in analysis process were analyzed,and the calibration of titrator concentration,the volume of titrator,the weight of sulfur mustard were considered as the main sources of the measurement uncertainty.The expanded uncertainty was 0.34%(k=2)as the purity of sulfur mustard was 94.78%.The uncertainty of the sulfur mustard weighing was the greatest impact on the measurement result.