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- W2371842904 abstract "0.5 g of dried and powdered tea sample was digested with 10 mL of HNO3-HClO4(4+1) mixed acid by heating on an electric hot-plate to obtain a transparent and clear solution,and then fumed to have a residual solution of ca.2 mL.5 mL of 6 mol·L-1 HCl were added and heated to reduce Se(Ⅵ) to Se(Ⅳ).Repeated evaporations(thrice) with additions of 2 mL portions of water to expel acid from the solution,and the solution was finally made up to 25.0 mL with HCl(4+96).The solution was introduced into the FI-system with the carrier HCl(4+96) and 10 g·L-1 KBH4 solution(dissolved in 5 g·L-1 KOH solution) was introduced as reductant.Linear relationship between values of fluorescence intensity and mass concentration of Se(Ⅳ) was kept in the range within 80 μg·L-1.Detection limit(3s/k) found was 0.034 μg·L-1.Samples of 3 kinds of tea were analyzed by this method.Recovery was tested by adding standard Se(Ⅳ) solution to the 3 tea samples as matrixes,values of recovery were found in the range from 97.8% to 103.0%,with RSD′s(n=6) less than 1.5%." @default.
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- W2371842904 date "2011-01-01" @default.
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- W2371842904 title "FI-HG-AFS Determination of Selenium in Tea" @default.
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