Se （Ⅳ） contents in rice samples after oxidizing acid digestion were investigated by flow injection-hydride generation atomic absorption spectrometric method （FI-HG-AAS）. The optimization was performed with varyin...Se （Ⅳ） contents in rice samples after oxidizing acid digestion were investigated by flow injection-hydride generation atomic absorption spectrometric method （FI-HG-AAS）. The optimization was performed with varying the formation of gaseous hydrides and the specific pieces of instrumentation. The results of FI-HG-AAS showed good linear calibration curve at the working concentration between 0.10 and 2.00 μg/L （R^2〉0.999）. For 7 replicate determinations of 0.75 μg/L selenium standard solution spiked in deionized water, the precision and accuracy were 2.33% and 86.63%, respectively. The detection limit （3σ/S, n=7） was 0.01 lag/L. Oxidizing acid digestions of rice samples were carried out at the ratio of 5：3 between nitric acid and perchloric acid. This method was succeeded to determine Se （Ⅳ） in acid digestion of rice samples without pre-reduction step with hydrochloric acid and heating.展开更多
文摘Se （Ⅳ） contents in rice samples after oxidizing acid digestion were investigated by flow injection-hydride generation atomic absorption spectrometric method （FI-HG-AAS）. The optimization was performed with varying the formation of gaseous hydrides and the specific pieces of instrumentation. The results of FI-HG-AAS showed good linear calibration curve at the working concentration between 0.10 and 2.00 μg/L （R^2〉0.999）. For 7 replicate determinations of 0.75 μg/L selenium standard solution spiked in deionized water, the precision and accuracy were 2.33% and 86.63%, respectively. The detection limit （3σ/S, n=7） was 0.01 lag/L. Oxidizing acid digestions of rice samples were carried out at the ratio of 5：3 between nitric acid and perchloric acid. This method was succeeded to determine Se （Ⅳ） in acid digestion of rice samples without pre-reduction step with hydrochloric acid and heating.
