原子荧光法测定地表水中硒的不确定度评定

摘要

[目的]解析原子荧光法在检测中的不确定度.[方法]依据测量不确定度评定与表示理论.运用国家标准方法,评定原子荧光法测定地表水中硒的不确定度.[结果]测得地表水样中硒的浓度为1.10 μg/L,该法的扩展不确定度U95=0.09 μg/L(k=2).[结论]对合成标准不确定度主要贡献来自仪器分析过程.%[ Objective] The study aimed to analyze the uncertainty in determination using atomic fluorescence spectrometry (AFS). [ Methed] According to the national standard method, the uncertainty of measuring selenium (Se) in surface water by AFS was evaluated based on the theory of evaluation and expression of uncertainty in measurement. [ Method]Se was detected at a concentration of 1.10 μg/L in the surface water, and 0.09 μg/L of the expanded uncertainty, U95(k=2), was obtained in the method. [Conclusion]The result indicated that the combined standard uncertainty mainly derived from instrument analysis.