基于不确定度评价对稻米中镉元素分析标准物质高精度定值方法的比较

doi:10.3969/j.issn.1000-1158.2021.05.17

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Abstract Through systematic analysis and evaluation of source, type and contribution of uncertainty for three classical methods including graphite furnace atomic absorption spectrometry (GFAAS), inductively coupled plasma mass spectrometry (ICP-MS) and isotope dilution-inductively coupled plasma mass spectrometry (ID-ICP-MS), it provides basic data for the selection of the best method, and contributed to the process control of the assignment value in the development of cadmium in rice matrix certified standard reference materials. The detected value are 0.478±0.028, 0.488±0.022, 0.485±0.014 mg/kg(k=2) for the GFAAS, ICP-MS and ID-ICP-MS respectively. The ID-ICP-MS proved to be the most reliable method and had the smallest uncertainty for the determination of cadmium in rice, at the same time, the ID-MS method is a benchmark method that can directly trace to the SI unit through the balance weighing and isotope abundance ratio. Therefore, it is an ideal method for determining the cadmium in the rice matrix standard reference materials. Although the uncertainties of GFAAS and the ICP-MS are larger than that of the ID-ICP-MS, the relative expanded uncertainty are only 5.7% and 4.4%, which also could be applied to the value assignment of inter-laboratory studies with different methods.

Key words： metrology rice cadmium reference material value assignment uncertainty evaluation

Received: 30 August 2019 Published: 24 May 2021

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TB99

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	ZHOU Ming-hui
	WU Yan-xiang
	CHEN Xi
	WANG Song-xue

Cite this article:

ZHOU Ming-hui,WU Yan-xiang,CHEN Xi, et al. Comparison of Methods for Cadmium Analysis in the Rice Matrix Certified Standard Reference Material Based on Uncertainty Evaluation[J]. Acta Metrologica Sinica, 2021, 42(5): 650-657.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2021.05.17 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2021/V42/I5/650

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