生活饮用水中溴酸盐含量测定的不确定度评定

Evaluate the Uncertainty of Determination of Bromate in Drinking Water

本方法通过离子色谱仪测定生活饮用水中溴酸盐含量,应用测量不确定度的评定方法,分析方法的不确定度来源,计算各分量不确定度,最后合成标准不确定度及评定扩展不确定度。在95%置信区间内,样品中的溴酸盐含量为(0.021 4±0.003 1)mg·L^(-1)(k=2)。影响不确定度的主要因素是标准溶液配制,因此在实验中应提高标准溶液配制的准确性。

This method uses an ion chromatograph to determine the content of bromate in drinking water.The evaluation method of measurement uncertainty is applied to analyze the source of uncertainty in the method,calculate the uncertainty of each component,and finally synthesize the standard uncertainty and evaluate the expanded uncertainty.Within the 95%confidence interval,the bromate content in the sample is(0.0214±0.0031)mg·L^(-1)(k=2).The main factor affecting uncertainty is the preparation of standard solutions,so the accuracy of standard solution preparation should be improved in experiments.