Concentration of organic compounds in natural waters with solid-phase dispersion based on advesicle modified silica prior to liquid chromatography

• Published in: Journal of Chromatography A Vol. 1097; no. 1; pp. 17 - 24
• Main Authors: Parisis, Nikolaos A., Giokas, Dimosthenis L., Vlessidis, Athanasios G., Evmiridis, Nicholaos P.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 02.12.2005; Elsevier
• Subjects: Advesicles; Analytical chemistry; Biological and medical sciences; Calibration; Chemistry; Chromatographic methods and physical methods associated with chromatography; Chromatography, Liquid - methods; Environmental pollutants toxicology; Exact sciences and technology; Fresh Water - chemistry; Hydrogen-Ion Concentration; Liquid chromatography; Medical sciences; Organic Chemicals - chemistry; Organic Chemicals - isolation & purification; Other chromatographic methods; Reproducibility of Results; Silicon Dioxide - chemistry; Solid-phase dispersion; Surface-Active Agents - chemistry; Temperature; Toxicology; Water; Water Pollutants, Chemical - isolation & purification; Water Purification - instrumentation; Water Purification - methods; Water samples; Liquid chromatography; Advesicles; Solid-phase dispersion; Water samples; Cosmetic; Water; Solid phase extraction; Chemical analysis; Adsorption isotherm; Cationic surfactant; HPLC chromatography; Micelle; Silica; Chemical enrichment; Sample preparation; Swimming pool; Sunscreen product; Adsorbent; Quantitative analysis; Matrix Solid Phase Dispersion extraction; Trace analysis; Coated material; Operating conditions; Reversed phase chromatography; Ultraviolet detector; Water quality; Water pollution; Comparative study
• ISSN: 0021-9673
• DOI: 10.1016/j.chroma.2005.08.034

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%.