电位滴定法测定鲜脆萝卜干中氯化物含量的不确定度评定

Uncertainly Evaluation for Determination of Chloride Content in Fresh Crisp Radish Dry by Potentiometric Titrator

采用电位滴定法测定军用鲜脆萝卜干氯化物含量的方法,通过标定、称量、标准滴定溶液电位滴定等因素的不确定度分量的评估,计算合成不确定度,最终给出样品中氯化物含量的合成标准不确定度及扩展不确定度。结果表明:军用鲜脆萝卜干氯化物的含量为(2.23±0.054)%,k=2,通过对不确定度的分析,得出影响氯化物含量不确定度的主要原因是测量重复性的不确定度。

The method for determination of chloride content in fresh crisp radish dry of military by automatic potentiometric titrator was the main research content of this paper. Through calibration weighing, weighing, titration of standard solutions and other factors to evaluate uncertain components and calculate the synthesis uncertainty. Finally, the synthesis standard uncertainty and extended uncertainty of chloride content in the samples were obtained. The results indicated that chloride content in fresh crisp radish dry of military was （2.23±0.048）%, k=2,through the analysis of uncertainty, the main reason for the uncertainly of chloride content is uncertainly of measuring repeatability.