Flow injection determination of Triton X-100 with on-line solid-phase extraction

Abstract

A simple and rapid method for the determination of Triton X-100 in the presence of a quinoline derivative is described. The method involves flow injection with on-line cation-exchange solid-phase extraction. The carrier consists of a mixture of 5 mmol dm^–3 aqueous KH₂PO₄(pH 2.0) and isobutyl alcohol–acetonitrile (50 + 50, v/v) in the proportion 65 + 35, v/v. Under these conditions, Triton X-100 elutes unretained, while the quinoline derivatives are retained on the extractor. Authentic samples were analysed by this method, with good precision and reproducibility.