饮用水中pH测量结果的不确定度评定

Evaluation of electrode assembly pH method forthe determination of the pH value of uncertainty in drinking water

目的:为减少实验误差,提高检测结果精确度,评定饮用水中PH测量结果的不确定度。方法:分析饮用水中PH测量结果的不确定度的来源,通过计算得出该法测定饮用水中PH测量结果的扩展不确定度。结果:不确定度评定结果为PH=7.68±0.03,p=95%。结论:该方法操作简便,可参考用于水中检测参数的不确定度评定。

Objective ： To evaluate the uncertainty of measuring pH in drinking water.This study was to decrease experimental error and increase the accuracy of results. Methods： The source of Measurement uncertainty of the pH in water was analyzed and assessment on uncertainty of pH determination in water was calculated. Results： The result showed that the expanded uncertainty was pH=7.68 ± 0.03,p=95% and the method was fit for the same kind of the samples. Conclusion： The method was easy and fit for various samples and the method was for reference to assessment on uncertainty of others parameters determination in water.