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- W1515906366 abstract "A sensitive and selective polymer-phase fluorescence quenching method for determination of trace amounts of manganese in food samples has been developed. The method is based on the reaction between manganese and eosin in the presence of phenanthroline to form a weak-fluorescence compound at pH 8.2. The fluorescence intensity was measured in 5 mm quartz cells at excitation and emission wavelengths of 533 and 550 nm, respectively. There was a satisfactory linear relationship between the fluorescence quenching and concentration of manganese in the range 0.2-3.5 μg in 25 mL of sample solution (i.e. 8-140 μg L -1 ). Detection limit was 0.03 μg for 25 mL of sample solution and RSD was 1.9%. Coexisting ions did not interfere with the reaction of eosin with manganese. The proposed method was applied to the determination of trace amounts of manganese in millet, black rice, and tea with satisfactory results." @default.
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- W1515906366 date "2008-01-01" @default.
- W1515906366 modified "2023-09-28" @default.
- W1515906366 title "Determination of manganese in food by polymer-phase fluorescence quenching method with eosin in the presence of phenanthroline" @default.
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