对电感耦合等离子体质谱法测定的地下水中 Tl元素不确定度的评定

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Tl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，但是并没有考虑前处理过程中产生的不确定度。结果表明，当实际样品中Tl的含量较低时，其曲线拟合产生的不确定度贡献影响较大，甚至成为主导因素，而当Tl的含量较高时曲线拟合产生的不确定度贡献率变得很小。

Uncertainty evaluation for the determination of thallium in groundwater samples by inductively coupled plasma-mass spectrometry

The measurement uncertainty of the analytical results of Tl in groundwater samples by inductively coupled plasma-mass spectrometry (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, but the uncertainty from pretreatment procedure was not considered. When the thallium 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. When the content of thallium is high, the uncertainty from standard curve fitting is relatively insignificant.