硫酸铈滴定液浓度标定的测量不确定度评定

Evaluation of Uncertainty for Concentration Calibration of Cerous Sulfate Titration Solution

目的:建立硫酸铈滴定液(0.1 mol/L)浓度标定的测量不确定度评定方法。方法:分析硫酸铈滴定液浓度标定的不确定度来源,建立测量模型,对其标定过程中各不确定度的分量进行分析评估,计算扩展不确定度。结果:硫酸铈滴定液(0.1 mol/L)浓度标定的扩展不确定度为0.000 5 mol/L,其浓度可表示为(0.101 2±0.000 5)mol/L,包含因子k=2。结论:该方法适用于硫酸铈滴定液浓度标定的测量不确定度评定。

OBJECTIVE：To establish a method for the evaluation of the uncertainty for the concentration calibration of Cerous sulfate titration solution（0.1 mol/L）. METHODS：The sources of uncertainty of Cerous sulfate titration solution was analyzed,and measurement model was established to evaluate the components of uncertainty and calculate the expanded uncertainty. RESULTS：The expanded uncertainty of Cerous sulfate titration solution（0.1 mol/L）was 0.000 5 mol/L and the concentration was（0.101 2±0.000 5）mol/L,coverage factor k=2. CONCLUSIONS：The method is suitable for the uncertainty evaluation for the concentration calibration of Cerous sulfate titration solution.