Solvent extraction of acenaphthene from dodecane into aqueous β-cyclodextrin medium and application to synchronous spectrofluorimetric determination in kerosene

Abstract

Acenaphthene can be selectively extracted from a dodecane phase into a water–dimethyl sulfoxide (20% v/v) medium containing β-cyclodextrin (10 mg cm^–3), potassium iodide (300 mg cm^–3) and sodium thiosulfate pentahydrate (15 mg cm^–3) with a shaking time of 3 min. The distribution ratio for the solvent extraction was 0.292 with a relative standard deviation of 8.3% at 20 ± 1 °C. The amount of acenaphthene extracted from 1 cm³ of dodecane by three 8 cm³ successive batch extractions was 97.3% in calculations and 95.1% in practice. The extraction behaviours of several typical two- and three-ring aromatic compounds were investigated under the same conditions. Selective extraction based on complexation with β-cyclodextrin was applied to the synchronous spectrofluorimetric determination of acenaphthene in commercially available kerosene.