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| Uncertainty Comparison of Two Methods for Detection of Cadmium in Fishery Products |
| TAN Xiuhui1,2,3, YANG Hongsheng1,2,3, HUANG Hongbing1, LI Jiajia1, XIA Liping1,2,3, ZHANG Qiuyun1,2,3, LIU Chang1,2,3, ZHU Xiaohua1,2,3 |
1. Freshwater Fishery Research Institute of Jiangsu Province, Nanjing 210017, China;
2. Aquatic Products Analysis and Testing Center of Jiangsu Province, Nanjing 210017, China;
3. Fishery Products Quality Supervision and Testing Center, Ministry of Agriculture and Rural Affairs, Nanjing 210017, China |
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Abstract The content of cadmium in FAPAS QC Material T07279QC was comparatively determined by both graphite furnace atomic absorption spectrometry (GFAAS) and inductively coupled plasma-mass spectrometry (ICP-MS), a mathematical model of uncertainty evaluation for detection of cadmium in fishery products was established, and each component of uncertainty of the two analytical methods was quantified to evaluate uncertainty of the two methods for the determination of cadmium in fishery products and to explore the sources of measurement uncertainty. The major uncertaintyof GFAAS method was found to be derived from variability of calibration curve, compared to standard solution preparation for ICP-MS method, with the higher expanded uncertainty in GFAAS method than that in ICP-MS method. The content of cadmium in the FAPAS QC Material T07279QC was calculated as (7.47±0.470) mg/kg by the GFAAS method and (7.53±0.376) mg/kg (k=2) by ICP-MS method. The determination values by two methods were both in consistency with the certified value (5.76—9.33 mg/kg).
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Received: 14 January 2020
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