生活饮用水pH值的测定及不确定度评定  

Determination and Uncertainty Assessment of pH Value in Drinking Water

作　　者：赵睿 Zhao Rui(Taiyuan Water Quality Monitoring Station Co.,Ltd.,Taiyuan Shanxi 030012,China)

机构地区：[1]太原水质监测站有限公司,山西太原030012

出　　处：《山西化工》2025年第1期106-108,共3页Shanxi Chemical Industry

摘　　要：本文通过电极法对生活饮用水中pH值测定引入的测量不确定度进行分析,结合建立的数学模型,研究了测定过程中存在的不确定度来源,通过计算各个不确定度分量,进一步得出合成不确定度和扩展不确定度。分析得出,仪器响应值引入的相对标准不确定度分量最大,为0.0020,扩展不确定度为0.04,水样pH值最终表示为:7.35±0.04(置信水平为95%,k=2)。This article analyzes the measurement uncertainty introduced by the electrode method in the determination of pH value in drinking water.Combined with the established mathematical model,the sources of uncertainty in the determination process are studied.By calculating each uncertainty component,the synthetic uncertainty and extended uncertainty are further obtained.Analysis shows that the relative standard uncertainty component introduced by the instrument response value is the largest,at 0.0020,with an extended uncertainty of 0.04.The final pH value of the water sample is expressed as 7.35±0.04(confidence level of 95%,k=2).

关 键 词：PH值 电极法 不确定度评定 

分 类 号：O661.1[理学—分析化学]