ネオクプロイン-銅(I)錯陽イオンを用いたレニウムの溶媒抽出吸光光度定量法と間接原子吸光定量法

概要

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Perrhenate anion forms ion-pair compound with neocuproin copper(I) chelate cation and is extracted into ethyl acetate. The extractcd species shows orange color and an absorption maximum exists at 456 nm. The measurement of the species in the organic phase by spectrophotometric method as well as the measurement of extracted copper by atomic absorption spectrophotometric method allow determination of microamount of rhenium. The recommended procedures are as follows: To the sample solution (pH 3 to 5), add 3ml of 0.11% cupric sulfate solution, 5ml of 3.4% potassium dihydrogen phosphate solution and 2ml of 5% hydroxylamine sulfate solution. Adjust the volume to about 25ml with water, shake the solution for 3min with 10ml of ethyl acetate containing 0.042% of neocuproin. Separate the organic phase and dehydrate it with sodium sulfate anhydride. Determine rheuium concentration by either spectrophotometry or indirect atomic absorption spectrophotometry. The molar extinction coefficient of the species in ethyl acetate is 7.3×10^3. Both methods are applicable to determination of more than 5μg of rhenium. More than 1mg of molybdenum interfere with the determination.
社団法人日本分析化学会の論文
1977-04-05