N-ベンゾイル-N-フェニルヒドロキシルアミンによる海水中のバナジウムの吸光光度定量

概要

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To simplify the spectrophotometric determination of micro amount of vanadium in sea water, the use of N-benzoyl-N-phenylhydroxylamine (BPA) has been studied. As the effect of large amount of iron(III) was examined, it was found that the absorbance of BPA-vanadium(V) complex decreased slightly with increasing amount of iron(III) until the amount of iron 1000 times as much as that of vanadium was reached. The effects of the concentration of various acids, potassium permanganate and BPA in the presence of large amount of iron(III) were also examined. On the basis of the results of experiments, water sampleo were analyzed as follows; 50mg of iron(III) was added to 2(-5) 1 of filtered sea water. Vandium was coprecipitated with iron(III) hydroxide at pH 6 to 7. The precipitates were dissolved in a small amount of 2N H_2SO_4. Vanadium was oxidized to quinquevalent state with 0.2ml of 3% KMnO_4 solution. After the reduction of excess permanganate with ethanol, the solution was diluted to 25ml with 3N HCl. Vanadium was extracted with 10ml of 0.1% BPA-CHCl_3 solution. The absorbance of CHCl_3 solution was measured at 530nm against water. The recovery of vanadium from sea water was detemined radiochemically, and found to be (93.6±2.1)%. The content of vanadium in sea water collected from the seas near the Bonin Island and Yoron Island were found to be 1.3 and 0.8μg/1, respectively.
社団法人日本分析化学会の論文
1975-03-10