ルモガリオンとのイオン会合を利用した陽イオン界面活性剤のけい光定量

抄録

Cationic surfactants such as cetyltrimethylammonium chloride and benzalkonium chloride were proved to be quantitatively analyzed by extracting as their ion-paired complexes of lumogallion, which is used as a reagent for the fluorescent determination of some metal ions. Thus, these complexes were most conveniently extracted with dichloromethane, and quantitatively analyzed by fluorometry upon addition of Al⁸⁺. Lumogallion was invariably extracted with these quarternary ammonium surfactants at pH range from 7.5 to 3.0, whereas it was negligibly extracted above neutral pH region in the presence of some diverse materials such as primary, secondary, and tertiary amines. Therefore, 7.3 was chosen as an optical pH in the extraction procedure for the quantitative analysis. The present analysis was not diversed in the presence of some metals. The calibration curves showed a good linearity over the range of 0.25-2.5μg/sample (ca. 0.01-0.1μg/ml). The coefficients of variation for the present method were 3.3 to 5.7%.