SOLVENT-EXTRACTION OF ACENAPHTHENE FROM DODECANE INTO AQUEOUS BETA-CYCLODEXTRIN MEDIUM AND APPLICATION TO SYNCHRONOUS SPECTROFLUOROMETRIC DETERMINATION IN KEROSENE

Acenaphthene can be selectively extracted from a dodecane phase into a water-dimethyl sulfoxide (20% v/v) medium containing beta-cylodextrin (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 degrees C. The amount of acenaphthene extracted from 1 cm(3) of dodecane by three 8 cm(3) 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 beta-cyclodextrin was applied to the synchronous spectrofluorimetric determination of acenaphthene in commercially available kerosene.