自动电位滴定法测定水泥中氯离子含量不确定度评定  

Evaluation of Uncertainty in Determination of Chloride Ion Content in Cement Using Automatic Potentiometric Titration Method

作　　者：窦妍 毛军涛 DOU Yan;MAO Juntao(Jiangsu Testing Center for Quality of Construction Engineering Co.,Ltd.,Nanjing Jiangsu 210028,China;Jiangsu Quality and Technical Supervision and Inspection for Construction Engineering Products,Nanjing Jiangsu 210028,China;National Center for Quality Supervision and Test of Urban Rail Transit Construction Engineering Product,Nanjing Jiangsu 210028,China)

机构地区：[1]江苏省建筑工程质量检测中心有限公司,江苏南京210028 [2]江苏省质量技术监督建筑工程产品质量检验站,江苏南京210028 [3]国家城市轨道交通建设工程产品质量检验检测中心,江苏南京210028

出　　处：《当代化工》2024年第10期2517-2520,共4页Contemporary Chemical Industry

基　　金：教育部高等教育司产学合作协同育人项目(项目编号:202002325040005)。

摘　　要：水泥材料中的氯离子含量对工程质量有着重要影响,因此需对其进行准确检测。自动电位滴定法相较于手动滴定方法,能够直接提升检测机构的工作效率和结果稳定度。依据标准检测方法和不确定度评定准则,检测机构开展自动电位滴定法测定水泥中氯离子含量不确定度评定工作能够提高氯离子检测结果准确性。通过建立数学模型、分析不确定度来源,并逐一开展各分项不确定度评估,从而计算出相对标准不确定度为0.0274,合成标准不确定度为0.0007946,扩展不确定度U95=0.002%。The chloride ion content in cement materials has a significant impact on engineering quality,therefore accurate detection is necessary.Compared to manual titration methods,automatic potentiometric titration can directly improve the work efficiency and result stability of detection institutions.According to standard testing methods and uncertainty evaluation criteria,testing institutions carried out the evaluation of uncertainty in the determination of chloride ion content in cement by automatic potentiometric titration to improve the accuracy of chloride ion detection results.By establishing a mathematical model,analyzing the sources of uncertainty,and evaluating each item of uncertainty one by one,the relative standard uncertainty was calculated to be 0.0274,the composite standard uncertainty was 0.0007946,and the expanded uncertainty U95=0.002%.

关 键 词：电位滴定法 不确定度 水泥 氯离子 

分 类 号：TQ420.711[化学工程] TB321[一般工业技术—材料科学与工程]