New approach on the alkylthiol determination in water byin situderivatization SPME followed by GC-ECD/NPD analysis
| Autor: | Maria Llompart, Roberto Alzaga, Josep M. Bayona, Carmen Garcia-Jares, Carmen Salgado-Petinal |
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| Rok vydání: | 2005 |
| Předmět: |
Chromatography
Chemistry Health Toxicology and Mutagenesis Extraction (chemistry) Public Health Environmental and Occupational Health Aqueous two-phase system Soil Science Pollution Analytical Chemistry Partition coefficient chemistry.chemical_compound Reagent Desorption Environmental Chemistry Chemical stability Selectivity Derivatization Waste Management and Disposal Water Science and Technology |
| Zdroj: | International Journal of Environmental Analytical Chemistry. 85:543-552 |
| ISSN: | 1029-0397 0306-7319 |
| DOI: | 10.1080/03067310500107195 |
| Popis: | Alkylthiols are very reactive and highly volatile compounds, and thus it is difficult to determine these in the water phase. In the present work, an in situ derivatization step prior to solid-phase microextraction (SPME) has been developed for their determination in water samples. The dinitrobenzylation reaction was selected because the high chemical stability of the corresponding thioethers formed provides a significant increase in the distribution coefficient between the SPME fibre and the aqueous phase, and a potential increase in the selectivity and sensitivity. Therefore, different derivatization reaction conditions (i.e. pH, temperature, reaction time and derivatizating reagent concentration) have been studied. Then, the main parameters affecting to the SPME process, that is coating selection, extraction time profile, extraction and desorption temperatures, have been optimized. Finally, a method based on a simple 2,4-dinitrophenylation reaction at pH 8–10, in 60 min at 75°C, coupled to direct SPME u... |
| Databáze: | OpenAIRE |
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