对电感耦合等离子体质谱法测定的地下水中Ag元素不确定度的评定

摘要

采用不确定度连续传递模型,对电感耦合等离子体质谱法测定的地下水中Ag元素的不确定度进行评定.采用双误差回归的方式对标准曲线进行拟合,通过计算出各分量的不确定度,合成得到测量结果的总不确定度.当实际样品中Ag的含量较低时,其曲线拟合产生的不确定度影响较大,甚至成为主导因素.%The measurement uncertainty of the analytical results of Ag in groundwater samples by inductively coupled plasma-mass spectrotnetry (ICP-MS) was evaluated using continuous propagation model of uncertainty. The regression of double error was used in the course of standard curve fitting. The extended uncertainty of measurement results was obtained from the synthesis of uncertainties from each source. When the silver content of the actual samples is relatively low, the uncertainty generated in the course of standard curve fitting is comparatively large and even becomes the dominant factor.