电感耦合等离子体质谱法测定地下水中锑的不确定度评定

Uncertainty Evaluation for the Determination Results of Antimony 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锑元素含量进行不确定度评定,并采用x、y的相对差,对标准曲线进行双误差回归。结果表明,水样中锑含量越低,其相对不确定度越大,且标准曲线的拟合过程引入的不确定度对其总不确定度有较大的贡献率,这与实验室中的实际测试情况相吻合。

Abstract: The measurement uncertainty for the analytical results of Sb in groundwater samples by inductively coupled plasma-mass spectrometry (ICP-MS) was evaluated using continuous propagation model of uncertainty. The x, y relative error concept and double error regression method for calibration curve fitting were introduced. The results showed that the lower the concentration of Sb in the sample, the greater the relative uncertainty of the measurement results. And the sub-uncertainty from the fitting of the calibration curve seems one of the major contributor to the expanded uncertainty.