EDTA滴定法によるアルミニウム合金中の亜鉛の迅速定量

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タイトル別名
  • Rapid Determination of Zn in Al Alloys by EDTA Titration Method
  • EDTA テキテイホウ ニ ヨル アルミニウム ゴウキン チュウ ノ アエン ノ ジンソク テイリョウ

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抄録

Zn in the presence of Al and Sn has been titrated with EDTA. To avoid the interference of Al and Sn, NH4F was used. The method has been successfully spplied to the determination of Zn in Al alloys. The proceduse is as follows: Weigh a 2 g sample into a beaker and dissolve it in 30 mL of 20%NaOH solution and 5 mL of 30%H2O2. After boiling out the excess H2O2, add Na2S solution, cool, dilute to volume in a 500 mL volumetric flask and filter through a dry filter paper. Fe, Mn, Cu, Ni, Ti, Ca, Mg, etc., remain on the filter paper as hydrous oxides or sulfides. Pipet 10 to 50 mL of the filtrate into a beaker and dilute to about 70 mL with water. Make it slightly acid with HCl and 3 g of NH4F (to mask Al and Sn) and 5 mL of 50%CH3COONH4 solution. Adjust the solution to pH 5 to 6 with 1 to 1 NH4OH. Heat at 70 to 80°C, add 3 to 4 drops of indicator (PAN), mix and titrate with 0.005 M EDTA solution. Then back-titrate the excess EDTA with 0.005 M CuSO4 solution.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 24 (8), 504-506, 1960

    公益社団法人 日本金属学会

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