氢化物发生-原子荧光法测定酱油中总砷的测量不确定度评定

Evaluation of the Measurement Uncertainty in the Determination of Total Arsenic in Soy Sauce by Hydride Generation-Atomic Fluorescence Spectrometry

建立氢化物发生-原子荧光法测定酱油中的总砷含量的不确定度模型,分析了方法中的不确定度分量及其来源,计算了各分量的不确定度,最后计算出了检测结果的合成标准不确定度和扩展不确定度。评定结果表明,校准曲线的线性回归和测量的重复性是影响该方法的不确定度的主要因素。

A mathematic model for the hydride generation-atomic fluorescence spectrometry determination of total arsenic in soy sauce was established. The calculation formula was deduced. Some data were collected in the procedure of analyzing the sample and the uncertainties of various variables were calculated. The combined uncertainty and expanded uncertainty were finally obtained by synthesizing the uncertainties of various component variables. The major source of uncertainty was the linearity of standard curve and the reoroduction of determination.