ICP-MS测定斑蝥中砷、铅、镉、汞含量不确定度的研究

袁利杰; 郑子栋; 宋汉敏; 郭毅

ICP-MS测定斑蝥中砷、铅、镉、汞含量不确定度的研究

Evaluation of Uncertainty for Determination of As, Pb, Cd, Hg in Mylabris by ICP-MS

摘要

摘要: 目的建立ICP-MS测定斑蝥中砷、铅、镉、汞含量不确定度的方法。方法采用ICP-MS测定斑蝥中砷、铅、镉、汞含量，依据JF1059-1999确定不确定度的各个分量并合成测量不确定度。结果斑蝥中砷、铅、镉、汞的含量分别为(0.51±0.03)，(0.24±0.02)，(0.029±0.002)，(0.046±0.005)mg·kg^-1。样品的消化、仪器的状态、曲线的拟合是斑蝥中常见有害元素含量分析的测量不确定度的主要因素。结论选择合适的消解方法，确定仪器的状态，保证溶液的基体匹配是保证测量结果准确性的关键步骤。

Abstract: OBJECTIVE To develop an evaluation method of the uncertainty of As, Pb, Cd, Hg in Mylabris by ICP-MS and find out the influencing factors of uncertainty. METHODS To determine the content of As, Pb, Cd and Hg in Mylabris by ICP-MS. The measurement uncertainty was confirmed according to JF1059-1999, and then the uncertainty was combined. RESULTS The amounts of As, Pb, Cd and Hg in Mylabris were (0.51±0.03), (0.24±0.02), (0.029±0.002) and (0.046± 0.005)mg·kg^-1. The mainly influencing factors of uncertainty were the sample preparation, curve fitting and the state of the apparatus. CONCLUSION In order to get accurate and reliable results, the optional digestion method, optimization of the instrumental conditions and solutions matching should be chosen. The evaluation of uncertainty provided references for the accurate extent of analysis results.

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