アゾ陽イオン染料を用いる吸光光度測定による非イオン界面活性剤の簡易定量法の開発

概要

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A simple spectrophotometric method for the determination of polyoxyethylene nonionic surfactants, such as TritonX-100 with 1-(p-phenylphenacyl)-4-(4-aminonaphthylazo)-pyridinium bromide (PPAP), was developed. PPAP was synthesized by quarternizing 4-(4-aminonaphthylazo)-pyridine with p-phenylphenacyl bromide. Because PPAP was easily associated with nonionic surfactants to produce a blue ion associate in aqueous solution, the concentration of nonionic surfactants were determined by measuring the absorbance of ion associates at 612 nm. The apparent molar absorptivity of the TritonX-10O ion associate was 1.0×10^3 dm^3 mol^<-1> cm^<-1> at 612 nm. The calibration graph for Tritonx-100 was linear over the range from 6.0×10^<-5> to 8.0×10^<-4>M, and the relative standard deviation for 5.6×10^<-4> M of TritonX-100 was 2.0%. The proposed method was applied to the determination of nonionic surfactants in commercial domestic detergents.
2003-10-05