A b s t r a c tThe optimal conditions for the microextraction separation, preconcentration and spectrophotometric determination of sodium dodecyl sulfate (SDS) as an its ion associate (IA) with Quinaldine Red (QR) have been studied. A large number of organic solvents was tested as extractants. Aliphatic hydrocarbons (hexane) poorly extract IA while halogen and nitro derivatives of hydrocarbons (chlorobenzene, bromobenzene, nitrobenzene, chloroform, dichloroethane), extract in addition to IA the simple salt of the dye. The best solvent found for the extraction of SDS was mixture of carbon tetrachloride with dichloroethane or chloroform that provided 10 to 50 fold concentration of SDS by microvolume of organic phase. The maximum extraction of SDS was achieved in the concentration range of QR 1.0•10 -4 mol/L of QR after which the optical density is not practically changed (excess of dye remains in the aqueous phase). The dye QR is highly stable in an alkaline environment. Hence, it can be used for the extraction of SDS in a wide pH range improving in this way the selectivity of the determination. The pH range for maximum extraction of ion associate was 4-12. We found that 50000-100000-fold amounts
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