En值应用于连续分析仪测定水中氰化物含量不确定度的分析  

The En Value is Applied to Analyze the Uncertainty in the Determination ofCyanide Content in Drinking Water by Continuous Analyzer

作　　者：江倩文 Jiang Qianwen(Zhuhai Center for Disease Control and Prevention,Zhuhai 519000,China)

机构地区：[1]珠海市疾病预防控制中心,广东珠海519000

出　　处：《广东化工》2024年第18期161-163,173,共4页Guangdong Chemical Industry

摘　　要：目的利用SKALAR SAN++连续分析仪测定水中氰化物含量的不确定度及En值检验。方法通过建立数学模型,对标准物质、标准使用液配制、方法多次测量、标准曲线拟合、加标回收率及其检出限等6个分量引入的不确定度进行分析评定,与权威检验机构所给的检出限的扩展不确定度进行比对,并通过En值检验评价本实验室仪器是否满足方法检测要求。结论本实验室检出限的扩展不确定度U=45.6%(k=2),权威检验机构所给的检出限的扩展不确定度U=50%(k=2),计算|En|=0.15<1,可认为该方法适用于连续流动法测定水中氰化物含量的不确定度评定,并可为在仪器检定周期内建立有效的内部质量控制方法提供参考价值。Objective to determine the uncertainty and En value of cyanide in water by Skalar San++continuous analyzer.Methods By establishing mathematical model,the uncertainty introduced by six components,including standard substance,preparation of standard solution,multiple measurements,standard curve fitting,recovery and detection limit,were analyzed and evaluated,comparison with the extended uncertainty of detection limit given by the authoritative inspection institution,the En value test was used to evaluate whether the laboratory instruments meet the detection requirements.Conclusion the extended uncertainty of the detection limit in our laboratory is U=45.6%(K=2),and the extended uncertainty of the detection limit given by the authority is U=50%(K=2),|En|=0.15<1,it can be considered that this method is suitable for the evaluation of uncertainty in the determination of cyanide content in water by continuous flow method,and can provide reference value for establishing efficient quality control method in the verification period of the instrument.

关 键 词：连续流动分析 氰化物 不确定度 En检验 

分 类 号：TQ[化学工程]