title: Aerosol-OT-gamma-alumina admicelles for the concentration of hydrophobic organic compounds in water.
abstract: A novel admicelle composing of a dialkylated anionic surfactant, di-2-ethylhexyl sodium sulfosuccinate (Aerosol-OT, AOT) and gamma-alumina was prepared by mixing them in acidic aqueous solution. The amount of the maximum sorption of AOT on 1 g of alumina at pH 2 was ca. 130 mg. By comparing the fluorescence spectra of N-phenyl-1-naphthylamine in different solvents, the solvent property of AOT-gamma-alumina admicelles was corresponding to that of toluene or diethyl ether. Thus, the AOT-gamma-alumina admicelles had greater hydrophobicity than SDS-gamma-alumina admicelles having similar hydrophobicity to 1-octanol or ethyl acetate. Hydrophobic organic compounds, chlorophenols having more than three chloro substituents, octylphenol, nonylphenol, dibutyl phthalate was almost quantitatively (98% or more) collected onto AOT admicelles composing of 1.5 g gamma-alumina and 150 mg AOT. The greater collection yields rather than those in SDS-admicellar system were ascribable to greater hydrophobicity and stability of AOT admicelles. After the 500-fold concentration, traces (nM) of organic contaminants in water samples were successfully detected with an HPLC having a photometric detector.
authors.affiliation: Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Furo, Chikusa, Nagoya 464-8603, Japan. saitoh@numse.nagoya-u.ac.jp
authors.forename: Tohru
authors.initials: T
authors.lastname: Saitoh
authors.forename: Seiichi
authors.initials: S
authors.lastname: Matsushima
authors.forename: Masataka
authors.initials: M
authors.lastname: Hiraide
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D004143:Dioctyl Sulfosuccinic Acid / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008823:Micelles; D009930:Organic Chemicals / Q000032:analysis*; D013501:Surface-Active Agents / Q000737:chemistry; D014867:Water / Q000737:chemistry*
chemical_list: D008823:Micelles; D009930:Organic Chemicals; D013501:Surface-Active Agents; D014867:Water; D004143:Dioctyl Sulfosuccinic Acid; D000535:Aluminum