Uncertainty in Simultaneous Determination of Cr, Ni, As and Pb in Hot-melt Adhesives for Cigarette by Inductively Coupled Plasma Mass Spectrometry
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In order to improve the accuracy of measurement results, the uncertainty in simultaneous determination of four heavy metal elements, namely chromium(Cr), nickel(Ni), arsenic(As) and lead(Pb) in hot-melt adhesives for cigarette using inductively coupled plasma mass spectrometry (ICP-MS) with microwave digestion is analyzed on the basis of JJF 1059.1-2012 ‘Evaluation and Expression of Uncertainty in Measurement’, and the uncertainty of the measurement is evaluated based on four aspects, namely the sample preparation, the standard solution preparation, the calibration curve fitting and repeatability examination. The results show that: 1) The calibration curve fitting is the most important factor affecting the combined uncertainty, the second is the standard solution preparation, the third is the repeatability examination, and the last is the sample preparation. 2) As the content of Cr, Ni, As and Pb in hot-melt adhesive for cigarette are 0.3555, 0.0308, 0.0102 and 0.0305μg/g, the expanded uncertainty of measurement results are 0.0321, 0.0102, 0.0057 and 0.0106μg/g (P=0.95, k=2), respectively. It is less likely to get accurate measurement results for the low concentration compared with the high. In order to obtain more close to the true values of the test, it is necessary to improve the accuracy of experimental results in the order of the calibration curve fitting, the standard solution preparation, the repeatability examination and the sample digestion.
Inductively coupled plasma mass spectrometry (ICP-MS), hot-melt adhesive for cigarette, heavy metal element, uncertainty.