酸性白土中のマンガンの簡易分析法

概要

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A simple method for the determination of manganese in Japanese acid clay with 4, 4-tetramethyldiaminodiphenylmethane is described. The established method is as follows. A half gram of crushed acid clay is put into a test tube of 10 ml capacity, and 5 ml of acetic acid-sodium acetate solution is added. It is shaken vigorously for one minute, and is filtered through a No. 5C filter paper. When a third volume is filtered, a drop is taken and spotted on the chromatographic paper. One drop of saturated potassium periodate is added, and after 2030 seconds to this are added two drops of 4, 4-tetramethyldiaminodiphenylmethane in chloroform solution. After 2 minutes, the blue coloration is determined against the standard. Although the resolution rate by acetic acid-sodium acetate solution is not high, the result is quite reproducible and only about five minutes is enough for the determination without any special equipment.