陰イオン交換樹脂分離―ＥＤＴＡ滴定法による銅合金中の亜鉛の迅速定量法

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タイトル別名
  • Rapid determination of zinc in copper alloy by anion exchange separation-EDTA titration
  • インイオン コウカン ジュシ ブンリ EDTA テキテイホウ ニヨル ドウ ゴ

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抄録

A simple and sensitive method was investigated for determination of zinc in copper alloy. The method is based on the combination of anion exchange separation by batch operation and EDTA titration.<BR>Sample is dissolved in 15 ml of HNO3(1+1) by heating, and resultant diluted to 200 ml with water. A 20 ml aliquot of this solution and 2 ml of H2SO4 (1+1) are taken into a beaker, and are evaporated to dryness. After cooling, the residue is dissolved in 2 N HCl by heating. The solution is transfered into the separatory funnel with a filter containing anion exchange resin Amberlite IRA-400, RCl form, (6080)mesh. The separatory funnel is shaken for 4 minutes to adsorb zinc ion. The solution in the funnel is sucked off. Resin is washed by shaking for 20 seconds with 25 ml of 2 N HCl (containing 0.01% Pb) and this operation is repeated (57) times. The adsorbed zinc ion is eluted with 20 ml of 2 N NH4OH (containing 40 g/l NH4Cl) by shaking for 2 minutes, and the eluent is filtered into an Erlenmeyer flask with suction, and this operation is repeated 5 times. The eluted solution is diluted to 200 ml with water, and mixed with 2 ml of potassium cyanide solution (10%) and 3 ml of formaldehyde solution (2+8) to mask the other metal ions. The solution is titrated with 0.02 M EDTA solution by using EBT as indicator.<BR>The time required for this test was about half of a usual column method.

収録刊行物

  • 分析化学

    分析化学 25 (10), 712-714, 1976

    公益社団法人 日本分析化学会

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