水銀中の微量鉄の溶媒抽出分析(ノート)
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概要
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A solvent extraction-atomic absorption spectrophotometry for the determination of trace amount of iron in mercury for electrolysis has been investigated.<BR>Isoamyl acetate was more suitable solvent than methyl isobutyl ketone or isopropyl ether, as for phase separation, flame stability and recovery of iron.<BR>30 g of sample was dissolved with nitric acid and evaporated to dryness. It was dissolved with hydrochloric acid containing 12 drops of bromine, and evaporated to dryness again, and then dissolved with 8 <I>N</I> hydrochloric acid. Iron(III) in the solution was extracted by isoamyl acetate. The isoamyl acetate phase was washed by 8 <I>N</I> hydrochloric acid, and iron(III) in the solvent phase was determined by atomic absorption spectrophotometry at 2483.3 A. Iron(III) in the washed solvent phase, was also successfully determined by spectrophotometry after back-extraction with diluted hydrochloric acid. The absorbance of the back-extracted phase colored by ammonium thiocyanate was measured at 460 nm. By this method, many samples could be treated at the same time without any chelate reagent. The relative error of the results was less than 3%, and recovery was more than 95%.
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