イオン交換樹脂を用いる銅中の微量の金の分離定量

平野 四蔵, 水池 敦, 飯田 芳男

doi:10.2116/bunsekikagaku.9.423

イオン交換樹脂を用いる銅中の微量の金の分離定量

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平野四蔵

東京大学工学部応用化学科工業分析化学教室
水池敦

東京大学工学部応用化学科工業分析化学教室
飯田芳男

東京大学工学部応用化学科工業分析化学教室

書誌事項

タイトル別名

Separation and determination of trace amounts of gold in copper by the use of anion exchange resin
イオンコウカンジュシオモチイルドウチュウノビリョウノカネノブンリテイリョウ

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説明

A method of separation has been developed for the photometric determination of microgram quantities of gold in copper metal by the use of anion exchange resin. After dissolution of the sample with HNO₃ and HCl, the solution is introduced into an anion exchange resin column (Amberlite IRA 400, Cl-form, 50100 mesh, 4 mmφ × 20 mm). Gold is retained strongly in the column, whereas copper passes through thoroughly. The resin is then converted to ash in an alumina crucible, and gold in the ash is determined by the photometric p-dimethylamino-benzylidenerhodanine method. Experiments using ¹⁹⁸Au and synthetic sample solutions indicate that gold in copper can be determined by this method within an accuracy of 5 to 10% in the range of 0.5 to 100 ppm. Three copper samples were analyzed by this method with the results in good agreement with those obtained by the standard fire assay and other methods of analysis. The time required for a determination is approximately 2 to 3 hrs.