Colorimetric determination of iron in tin-base Babbitt metal using methyl isobutyl ketone extraction

TAJIMA Nobuo, KUROBE Moriji

doi:10.2116/bunsekikagaku.9.399

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Other Title

メチルイソブチルケトン抽出,チオシアン発色によるスズ基バビットメタル中の鉄の定量方法
メチルイソブチルケトンチュウシュツ , チオシアンハッショクニヨルスズキバビットメタルチュウノテツノテイリョウホウホウ
Solvent extraction in analytical chemistry. I
溶媒抽出法の工業分析への応用(第1報)

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Abstract

For the determination of iron in tin-base Babbitt metal, the separation of tin as the main constituent is often to be a troublesome procedure. In the proposed method, the sample is dissolved in approximately 6N HCl, iron is reduced to Fe²⁺, and tin is extracted with methyl isobutyl ketone (MIBK) to be separated from iron. Thereafter, red color developed by adding ammonium thiocyanate is extracted with MIBK and iron is determined colorimetrically, by using the maximum absorbancy at 490 mμ.<BR>The sample (1g) is dissolved in a HCl-HNO₃ mixture and made up to 100 ml with water. A 5ml portion is made to 6N in HCl, Na₂S₂O₃ soln. added and Fe²⁺ and tin are separated by MIBK extraction. The aqueous layer is treated with H₂O₂ and boiled to decompose the excess of Na₂S₂O₃, cooled, and Fe³⁺ of this solution is extracted with 25ml MIBK. The solvent layer is shaken with NH₄NCS soln. and the coloration of iron is developed.<BR>By use of the above method, iron in tin-base Babbitt metal was determined with the result shown in Table III.

Journal

BUNSEKI KAGAKU

BUNSEKI KAGAKU 9 (5), 399-402, 1960

The Japan Society for Analytical Chemistry

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