全自动测汞仪和原子荧光光谱仪测定竹荪中总汞含量不确定度的比较

Comparison of Uncertainty Evaluation for the Determination of Mercury Content in Dictyophora by Automatic Mercury Analyzer and Atomic Fluorescence Spectrometer

摘要: 采用全自动测汞仪和原子荧光光谱仪分别测定了竹荪中总汞的含量。通过建立数学模型，全面地分析不确定度的主要来源，计算出不确定度的各个分量，得出合成不确定度和扩展不确定度，并对评估结果进行比较。结果表明：当总汞的测定结果为0.050 mg/kg时，两种方法的扩展不确定度分别为0.006、0.002 mg/kg（k=2）。本方法可为今后采用全自动测汞仪和原子荧光光谱仪测定食用菌中总汞的不确定度评估提供参考。

Abstract: The content of mercury in Dictyophora was determined by automatic mercury analyzer and atomic fluorescence spectrometer. The main sources of uncertainty were analyzed and the main uncertainty components were calculated by establishing mathematical model, and the synthetic uncertainty and extended uncertainty were obtained, and the uncertainties results were compared. Results showed that, the expanded uncertainties of these two methods were 0.006 and 0.002 mg/kg(k=2), when the determination results of mercury were 0.050 mg/kg.This study might provide a guideline for uncertainty evaluation for determining mercury in edible fungus by automatic mercury analyzer and atomic fluorescence spectrometry.