著者

中村 栄子 石渡 孔実子 並木 博

出版者

公益社団法人日本分析化学会

雑誌

分析化学 (ISSN:05251931)

巻号頁・発行日

vol.39, no.12, pp.845-847, 1990-12-05

被引用文献数

4 5

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After removal of anionic surfactants by an ion-exchange technique, cationic surfactants were extracted as their chlorides into chloroform. Ion pairs of the cationic surfactants and Disulphine Blue formed in the chloroform phase were measured spectrophotometrically as follows : A 50 ml of a sample solution containing cationic surfactants (above 1μg as Zephiramine) is passed through an anion-exchange column (Amberlite IRA-401,15 ml) at a rate of 1 ml/ min and the column is washed with 50 ml of 50% methanol. Five milliliters of sodium chloride solution (10%) and l0 ml of chloroform are added to the eluate. The mixture is then shaken for 1 min to extract cationic surfactants into chloroform. The chloroform phase is shaken for 1 min with a mixture of 10 ml of citrate buffer solution (0.1 M, pH 5), 5 ml of sodium sulfate solution (0.4 M) and 1.5 ml of Disulphine Blue solution (1.17×10^<-4> M). The absorbance of the chloroform phase is measured at 628 nm. Cationlc surfactants in water above 20 μg/l could be determined by the proposed method.