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

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.