臭化1-(4-プロモメチルベンジル)-4-(4-ジエチルアミノフェニルアゾ)-ピリジニウムを用いる陰イオン界面活性剤の吸光光度定量

概要

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A new cationic dye, 1-(4-bromomethylbenzyl)-4-(4-diethylaminophenylazo)-pyridinium bromide, with anionic surfactants such as laurylbenzenesulfonate(LBS) and laurylsulfate(LS), reacts to form ion-associates extractable into benzene. The concentration of the surfactants can be determined by measuring the absorbance of extracts at 545 nm. Calibration curve obeyed Beer's law over the range 0.22〜2.2×10^<-5> mol dm^<-3> (in benzene) of the surfactans. The apparent molar absorptivity of the ion-associates is 34000 dm^3 mol^<-1> cm^<-1>. The procedure for surfactant determination is as follows : In a 30 ml stoppered test tube, place 25 ml of sample solution, 1 ml of 4.9×10^<-4> mol dm^<-3> reagent and 1 ml of phosphate buffer solution (pH 7). Add 5 ml of benzene, and shake the test tube for 5 min mechanically and allow to stand for 15 min. Measure the absorbance of the benzene phase at 545 nm with glass cells of 1-cm path-length. The relative standard deviation for 1.1×10^<-6> mol dm^<-3> LBS was 3.4%.
1986-01-05