Determination of trace elements in Brazilian rice grains and in biological reference materials by neutron activation analysis |
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| Authors: | V A Maihara M B A Vasconcellos |
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| Institution: | (1) Radiochemistry Division, Instituto de Pesquisas Energéticas e Nucleares, CNEN/SP, Caixa Postal 11049, 05499 São Paulo, SP, Brasil |
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| Abstract: | Instrumental neutron activation analysis was applied to the determination of the elements Na, K, Br, As, Rb, Zn, Co, Fe and Sc in Brazilian rice samples and in biological standards. Hg and Se concentrations were determined by using a simple radiochemical separation. The chemical procedure was carried out by means of distillation of Hg and Se in HBr medium and subsequent precipitation of selenium by sodium metabisulfite and mercury by thioacetamide. The accuracy of the instrumental and radiochemical methods was evaluated by means of analysis of the Reference Materials NBS-Bovine Liver, Bowen's Kale and NBS-Rice Flour. |
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