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目的探讨滴定法中测定水中总硬度不确定度的方法。方法根据测量不确定度的评定原理和测定方法,建立数学模型,得出方法的合成标准不确定度与扩展不确定度。结果滴定法测定水中总硬度的合成标准不确定度0.66mg/L,扩展不确定度为1.32mg/L。结论该文所提出的方法用于水中总硬度不确定度分析,由终点判断引入的不确定度分量起主要作用,该不确定度分析处于较好的受控状态。
Objective To investigate the method of determining the uncertainty of total hardness in water by titration. Methods According to the evaluation principle and measurement method of measurement uncertainty, the mathematical model was established and the method of synthesis standard uncertainty and extended uncertainty were obtained. Results The titration method was used to determine the combined standard uncertainty of total water hardness of 0.66 mg / L with an extended uncertainty of 1.32 mg / L. Conclusion The method proposed in this paper is applied to the analysis of uncertainty of total hardness in water. It plays a major role in determining the component of uncertainty introduced by the endpoint judgment, and the uncertainty analysis is in a better controlled state.