title: Tetraiodophenolsulfonphthalein as a spectral substitute to characterize the complexation between cationic and anionic surfactant.
abstract: The complexation of cetyltrimethylammonium bromide (CTAB) with sodium dodecyl sulfate (SDS) with sodium dodecyl benzene sulfonate (SDBS), with tetraiodophenolsulfonphthalein (TIPST) as a spectral substitute was investigated at pH 5.89 and 8.30 by the microsurface adsorption--spectral correction (MSASC) technique. The aggregations of TIPST, SDS, and SDBS on CTAB obeyed the Langmuir isothermal adsorption. The aggregates TIPST-CTAB, TIPST2-CTAB3, SDS3-CTAB2, and SDBS3-CTAB2 were formed at 20 degrees C and the binding constants of all the aggregates were determined. The replacement of TIPST-binding CTAB monomer with SDS or SDBS at pH 5.89 was applied to the quantitative determination of anionic detergent (AD) in water with satisfactory recovery.
authors.affiliation: Key Laboratory of Changjiang River Water Environment of Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China. hwgao@mail.tongji.edu.cn
authors.forename: Hong-Wen
authors.initials: HW
authors.lastname: Gao
authors.forename: Yan
authors.initials: Y
authors.lastname: Qian
authors.forename: Zhang-Jun
authors.initials: ZJ
authors.lastname: Hu
mesh_terms: D000327:Adsorption; D000838:Anions / Q000737:chemistry; D001557:Benzenesulfonates / Q000737:chemistry; D002412:Cations / Q000737:chemistry; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D000838:Anions; D001557:Benzenesulfonates; D002412:Cations; D002593:Cetrimonium Compounds; D010636:Phenols; D013501:Surface-Active Agents; D012967:Sodium Dodecyl Sulfate; C034202:iodophenol blue; C001114:dodecylbenzenesulfonic acid; D000077286:Cetrimonium