硝酸银电位滴定法测定外加剂中氯离子含量的不确定评定  

Uncertainty Evaluation of Measurement of the Chloride ion content in admixtures using silver nitrate by potentiometric titration method

作　　者：李赵相 赵磊[1,2] 白锡庆[1,2,4] 

机构地区：[1]天津市建筑材料产品质量监督检测中心,天津300381 [2]天津市质量监督检验站第二十一站,天津300381 [3]天津市建筑材料科学研究院研发中心,天津300381 [4]天津市建筑材料科学研究院,天津300381

出　　处：《福建分析测试》2014年第1期52-58,共7页Fujian Analysis & Testing

摘　　要：依据JJF 1059-1999测量不确定度评定与表示,从试剂纯度、摩尔质量、电子天平称量、容量瓶、滴定管、移液管、酸度计、重复性测试等影响因素引入的不确定度分量,对以硝酸银溶液用电位滴定法测定外加剂中氯离子含量进行不确定度评估。分析了测定过程中不确定度来源,量化不确定度分量,求出了合成不确定度和扩展不确定度,给出了测定结果的表示式为(5.43±0.30)%,k=2。According to （Evaluation and Expression of Uncertainty in Measurement）） （JJF 1059- 1999） , the purity of regent, molar mass, weigh of analysis balance, volumetric flasks, burettes, pipettes, ph meters, repeatability test which led by uncertainty sources to evaluate, the uncertainty of measurement of the Chloride ion content in admixtures using silver nitrate by potentiometric titration method were evaluated. Analyzing the sources of uncertainty in the entire course of the determination and calculating each component of uncertainty, the combined uncertainty and expanded uncertainty were obtained, and the mathematical expression of the determination result of Chloride ion content was （5.43＋0.30）%, k=2.

关 键 词：电位滴定法 氯离子 不确定度 外加剂 

分 类 号：O657.15[理学—分析化学]