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目的建立氢化物原子荧光法测定生活饮用水中砷的不确定度评定方法,给出不确定度,为提高检测质量提供依据,评定测定结果,找出主要影响因素。方法根据有关生活饮水检验的科学方法和法律法规规定的有关生活饮用水的金属指标GB/T5750,6-2006,应用测量不确定度理论,建立检测方法的数学模型,通过对标准系列稀释过程以及水样的量取等相关过程的讨论分析,讨论每个过程的不确定度分量,并对影响不确定度的因素进行评估。结果对扩展不确定度影响比较大的两大因素分别是标准系列稀释过程和仪器测量精密度过程。讨论与体积相关的四个分项的不确定度,并将标准系列稀释过程作为讨论的重点。结论此方法适用于评估氢化物原子荧光法测定生活饮用水中砷含量的不确定度。“,”Objective To build the method of evaluation of determination of arsenic in drinking water by Hydride Generation Atomic Fluorescence Spectrometry with uncertainty,give the uncertainty, provide a basis for improving the detection quality, determination of evaluation results,and find out the main influencing factors.Methods The mathematical model established detection method was built used the theory of measurement uncertainty according to the metal indicators related to drinking water drinking water GB/T5750,6-2006 provisions on inspection of scientific methods and laws and regulations,the standard serial dilution process and the amount of water and other related processes was discussed and analysised,uncertainty component of each process was discussed and ef ect of uncertain factors were valuated.Results Two major factors with greater impact on expanded uncertainty were the standard serial dilution process and instrument measurement precision process.The four sub volume and related uncertainty were discuss,and the focus of discussion was the standard serial dilution process.Conclusion This method is suitable to evaluate the uncertainty of hydride generation atomic fluorescence spectrometry for determination of arsenic in drinking water.