title: Concentration of organic compounds in natural waters with solid-phase dispersion based on advesicle modified silica prior to liquid chromatography.
abstract: The ability of vesicle-coated silica to aid the extraction of organic compounds from water prior to liquid chromatographic analysis is presented for the first time. The method is based on the formation of silica supported cationic multi-lamellar vesicles of gemini surfactants inherently ensuring the presence of hydrophilic and hydrophobic sites for the partitioning of analytes bearing different properties. Method development is illustrated by studying the adsolubilization of UV absorbing chemicals from swimming pool water. Due to the requirement for external energy input (intense shearing) a method based on solid-phase dispersion (SPD) was applied producing better results than off-line solid-phase extraction (SPE). Meticulous investigation of the experimental parameters was conducted in order to elucidate the mechanisms behind the proposed extraction pattern. Analyte recoveries were quantitative under the optimum experimental conditions offering recoveries higher than 96% with RSD values below 5%.
authors.affiliation: Laboratory of Analytical Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece.
authors.forename: Nikolaos A
authors.initials: NA
authors.lastname: Parisis
authors.forename: Dimosthenis L
authors.initials: DL
authors.lastname: Giokas
authors.forename: Athanasios G
authors.initials: AG
authors.lastname: Vlessidis
authors.forename: Nicholaos P
authors.initials: NP
authors.lastname: Evmiridis
mesh_terms: D002138:Calibration; D002853:Chromatography, Liquid / Q000379:methods*; D005618:Fresh Water / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009930:Organic Chemicals / Q000737:chemistry / Q000302:isolation & purification*; D015203:Reproducibility of Results; D012822:Silicon Dioxide / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000295:instrumentation / Q000379:methods
chemical_list: D009930:Organic Chemicals; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide