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.
周明慧,伍燕湘,陈曦,王松雪. 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[J]. 计量学报, 2021, 42(5): 650-657.
ZHOU Ming-hui,WU Yan-xiang,CHEN Xi,WANG Song-xue. Comparison of Methods for Cadmium Analysis in the Rice Matrix Certified Standard Reference Material Based on Uncertainty Evaluation. Acta Metrologica Sinica, 2021, 42(5): 650-657.
［1］Liu Y, Liu K, Li Y, et al. Cadmium contamination of soil and crops is affected by intercropping and rotation systems in the lower reaches of the Minjiang River in south-western China ［J］. Environmental Geochemistry & Health, 2016, 38 (3): 811-820.
［2］Rehman Z U, Khan S, Brusseau M L, et al. Lead and cadmium contamination and exposure risk assessment via consumption of vegetables grown in agricultural soils of five-selected regions of Pakistan ［J］. Chemosphere, 2017, 168: 1589-1596.
［3］Satarug S, Vesey D A, Gobe G C. Current health risk assessment practice for dietary cadmium: Data from different countries ［J］. Food & Chemical Toxicology, 2017, 106 (Pt A): 430-445.
［4］Holdaway J, Wang W. From Soil Pollution to “Cadmium Rice” to Public Health Impacts: An Interdisciplinary Analysis of Influencing Factors and Possible Responses ［J］. Journal of Resources and Ecology, 2018, 9 (1):1-12.
［5］JJF 1005—2016标准物质通用术语和定义［S］. 2016.
［6］JJF 1343—2012标准物质定值的通用原则及统计学原理［S］. 2012.
［7］Chen L, Chen J W, Liu S S, et al. Determination of cadmium content in rice from Wuhan market using graphite furnace atomic absorption spectrometry ［J］. Journal of Food Safety & Quality, 2015, 6 (4): 1394-1400.
［8］Fan H P, Jian-Sheng J I, Feng F U, et al. Uncertainty Evaluation for Cadmium Determination in Flour by Graphite Furnace Atomic Absorption Spectrometry ［J］. Food Science, 2011, 32 (18): 243-245.
［9］陈仁杰, 黄婷婷, 吕良勇, 等. ICP-MS测定陶瓷片密封水嘴浸泡液中镉含量的不确定度分析 ［J］. 计量学报, 2018, 39 (6):164-167.
Chen R J, Huang T T, Lv L Y, et al. Evaluation of Uncertainty in Measurement of Cadmium in Immersion Solution of Ceramic Cartridge Faucets by ICP-MS ［J］. Acta Metrological Sinica, 2018, 39 (6): 164-167.
［10］Zhang J, Zhang J, Li Z, et al. Comparative Study of Uncertainty Evaluation for the Determination of Cadmium Content in Rice by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) and Graphite Furnace Ato-mic Absorption Spectrometry ［J］. Food Science, 2016, 37 (16): 185-189.
［11］Barwick V J, Ellison S L R, Fairman B. Estimation of uncertainties in ICP-MS analysis: a practical methodology ［J］. Analytica Chimica Acta, 1999, 394 (2): 281-291.
［12］Murphy K E, Long S E, Vocke R D. On the certification of cadmium at trace and ultratrace levels in standard reference materials using ID ICP-MS ［J］. Anal Bioanal Chem, 2007, 387 (7): 2453-61.
［13］Zhu Y B, Chiba K. Determination of cadmium in food samples by ID-ICP-MS with solid phase extraction for eliminating spectral-interferences ［J］. Talanta, 2012, 90 (15): 57-62.
［14］Teránbaamonde J, Sotoferreiro R M, Carlosena A, et al. Determination of cadmium in sediments by diluted HCI extraction and isotope dilution ICP-MS ［J］. Talanta, 2018, 186 (15): 272-278.
［15］赵辉, 郝淑杰, 刘原栋, 等. 基准方法及其在标准物质定值中的应用 ［J］. 化学分析计量, 2018, 27 (S1): 107-110.
Zhao H,Hao S J,Liu Y D, et al. Primary method and its application of characterization of reference materials ［J］. Chemical Analysis and Meterage, 2018, 27 (S1): 107-110.
［16］JJF 1135—2005化学分析测量不确定度评定 ［S］. 2005.
［17］全国标准物质管理委员会. 标准物质的研制管理和应用 ［M］. 北京:中国计量出版社, 2010.
［18］GB/T 27411—2012检验实验室中常用不确定度评定方法与表示 ［S］. 2012.
2021, Vol. 42 
