Abstract
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-100 ion associate was 1.0×103 dm3 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.
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