电感耦合等离子体质谱法测定地下水中镉的不确定度评定

Uncertainty Evaluation for the Determination of Cadmium in Groundwater Samples by Inductively Coupled Plasma-Mass Spectrometry

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地下水中镉元素的不确定度进行评定。其不确定度主要来源于标准溶液引入的不确定度、曲线拟合产生的不确定度和测量过程中引入的不确定度三部分。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。

Abstract: The measurement uncertainty for the analytical results of cdmium in groundwater samples by inductively coupled plasma-mass spectrometry (ICP-MS) was evaluated using Continuous Propagation Model of Uncertainty. The main sources of measurement uncertainty came from sub-uncertainties of calibration solutions, calibration curve fitting and measurements. The double-error regression was used in the course of standard curve fitting. The overall uncertainty of measurement results was obtained from the synthesis of sub-uncertainties.