Uncertainty Evaluation for the Determination of Cadmium in Peanuts by ICP-MS

doi:10.7506/spkx1002-6630-201114062

Abstract

Abstract: Objective: To establish a determination method of cadmium in peanuts by inductively coupled plasma-mass spectroscopy (ICP-MS) and evaluate the uncertainty of determination results. Methods: A mathematic model was established by analyzing the uncertainty sources from different parts. The final uncertainty degree was calculated by standard uncertainty and extended uncertainty during measurements. Results: The cadmium content in peanuts was determined to be (162 ±5)μg/kg with a k value of 2, which met the national standard. The major uncertainty was attributed to four sources such as repeatability of measurement, calibration of standard solution, volume and sampling. Conclusion: This method is applicable to the evaluation of uncertainty during component determination in foods by ICP-MS.

Key words: inductively coupled plasma-mass spectroscopy (ICP-MS), cadmium, uncertainty evaluation, peanut, calibration

CLC Number:

LIU Tong-ying，WU Shan-feng，ZHANG Li-dong. Uncertainty Evaluation for the Determination of Cadmium in Peanuts by ICP-MS[J]. FOOD SCIENCE, 2011, 32(14): 285-288.

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Uncertainty Evaluation for the Determination of Cadmium in Peanuts by ICP-MS

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