Sodium dodecyl sulfate-coated alumina and C18 cartridge for the separation and preconcentration of cationic surfactants prior to their quantitation by spectrophotometric method

Journal of the Brazilian Chemical Society

Mohammad Ali Karimi²  Reza Behjatmanesh-ardakani¹  Ali Aghaei Goudi¹  Sara Zali¹ 

[1] ,Payame Noor University Faculty of Science Department of ChemistrySirjan,Iran

关键词: cationic surfactants;    sodium dodecyl sulfate;    γ-alumina;    C18 cartridge;    solid phase extraction;   

DOI  :  10.1590/S0103-50532008000800011

来源: SciELO

【 摘 要 】

A new solid phase extraction method has been developed to the separation and preconcentration of trace amounts of cationic surfactants i.e. dodecyltrimethylammonium bromide (DTAB), cetyltrimethylammonium bromide (CTAB) and cetylpyridinium chloride (CPC). This method is based on the sorption of anionic surfactant (AS-) of sodium dodecyl sulfate (SDS) on the γ-alumina surface and C18 cartridge is used for preconcentration of cationic surfactants (CS+). Spectrophotometric determination method used for the determination of cationic surfactants is based on the competition between the cationic dye of methylene blue (MB+) and CS+ for association complex formation with SDS. The MB+in the ion associate complex can be quantitatively substituted by CS+ leading to an increase in the absorbance measured at 662 nm. Optimum experimental conditions for separation, preconcentration and determination of cationic surfactants have been reported. Under the selected optimal conditions, preconcentration factor of two-fold was achieved and the results showed that determination of CPC, DTAB and CTAB could be performed in concentration ranges of 1×10-5-2×10-4, 4×10-5-5×10-4 and 5×10-5-5×10-4 mol L-1, respectively. Eleven determinations of 10.0 mg mL-1 of CPC, DTAB and CTAB solutions led to RSD's of 4.3, 3.7 and 4.0%, respectively. Method was validated using a set of different samples containing cationic surfactants.

【 授权许可】

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