洗剤ビルダー分析の自動化 (第2報)
アントロン法によるカルボキシメチルセルロース=ナトリウムの定量
1977 年 26 巻 5 号 p. 287-290
詳細
1977 年 26 巻 5 号 p. 287-290
An automated method for the determination of sodium carboxymethylcellulose (CMC) in detergents was developed by the use of Technicon Auto Analyzer.
The aqueous solution of a sample, which was the insoluble materials of detergents in 95 % ethyl alcohol solution, was directly introduced into the Auto Analyzer. The solution was mixed with anthrone dissolved in 80 vol/vol% sulfuric acid solution, heated in an oil bath held at 99°C for 1415 min and then color intensity was measured at 620 nm automatically. The accuracy is within 3% relative.
However, bleaching agents, such as sodium perborate and sodium percarbonate, decomposed anthrone and interfered the determination of CMC. In these cases, they were decomposed before the determination by boiling in the presence of sodium chloride. By this treatment, CMC in detergents containing bleaching agents could also be determined within the same accuracy. Therefore, this automated method should be applicable to the determination of CMC in detergents.
