冷原子吸收法测定土壤中总汞的不确定度研究

Study on Uncertainty of Determination of Total Mercury in Soil by Cold Atomic Absorption Spectrometry

对冷原子吸收法测定土壤中汞过程的不确定度和来源进行分析。测量不确定度是一种评定测量可靠度的方法,能合理表征赋予被测量值的分散性,客观真实地反映测量结果,通过数学模型计算分析各不确定度的分量,得出相对合成不确定度为3.52%。结果表明,引起不确定度的最大因素是标准曲线的拟合,而重复性测量和样品制备过程也会对不确定度的引入有较大影响。

Analyze the uncertainty and source of mercury determination in soil using cold atomic absorption spectrometry.Measurement uncertainty is a method of evaluating measurement reliability,which can reasonably characterize the dispersion of the assigned measured values and objectively reflect the measurement results.By calculating and analyzing the components of each uncertainty through mathematical models,a relative combined uncertainty of 3.52%is obtained.The results indicate that the biggest factor causing uncertainty is the fitting of the standard curve,and the repeatability measurement and sample preparation process also have a significant impact on the introduction of uncertainty.