摘要
根据GB/T 11896-1989《水质氯化物的测定硝酸银滴定法》国标方法对水中氯化物测定的不确定度进行评定。首先对不确定度主要来源进行识别,如测量重复性、标准NaCl的纯度、称量和定容、液体的转移、标准溶液在滴定和标定时滴定管的体积计量、温度等,然后建立数学模型,分别计算各输入量的不确定度分量和相对不确定度分量,合成各相对不确定度分量的方差和合成标准不确定度计算,得到测量结果的最终表示方式。
According to GB11896-1989 ＂water quality—determination of chloride—silver nitrate titration method＂,uncertainty in chloride content measurement was evaluated.The evaluation method was as follows： fist of all,to recognize the main source of uncertainty,including measurement repeatability,purity of NaCl standard,weighing and making up to volume,volume metering in liquid transfer,titration and standardization,and corresponding temperature effect on volume;then,to set up a mathematical model;to calculate the uncertainty of each input component and the relative uncertainty components;to synthesize the variance of relative uncertainty components;to estimate the combined standard uncertainty;finally to form a format of measurement result.
出处
《分析试验室》
CAS
CSCD
北大核心
2012年第6期96-99,共4页
Chinese Journal of Analysis Laboratory
关键词
不确定度评定
氯离子
水
硝酸银滴定法
Evaluation of uncertainty
Chloride
Water
AgNO3 titrimetry
