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Details van artikel 11 van 28 gevonden artikelen
| Titel: |
Determination of thiophanate-methyl and chlorotoluron in water samples by improved single-drop microextraction coupled with high-performance liquid chromatography |
| Auteur: |
Ye, Cunling Zhou, Qingxiang Wang, Xinming |
| Verschenen in: |
International journal of environmental analytical chemistry |
| Paginering: | Jaargang 88 (2008) nr. 7 pagina's 461-471 |
| Jaar: |
2008-06 |
| Inhoud: |
An improved single-drop microextraction method for the determination of thiophanate-methyl and chlorotoluron in water samples was developed, with analysis by high-performance liquid chromatography-ultraviolet detection (HPLC-UV). Several parameters such as solvent type, salt concentration, stirring rate, extraction time, pH and organic drop volume were investigated. The optimum experimental conditions found were: 20 µL 1-octanol, 10% (w/v) NaCl, 600 rpm stirring rate, 40 min extraction time, neutral sample pH and 5 mL water sample. Under the optimum conditions, the enrichment factors were 45.3 and 107.0 folds for thiophanate-methyl and chlorotoluron, respectively. The method exhibited a wide linear range (1-100 µg L-1), reasonable detection limits (0.35 µg L-1) and suitable repeatability (RSD < 9.6%) for both analytes. The proposed method was validated with three real water samples fortified at two levels, and reasonable spiked recoveries were achieved in the range of 84.0% ∼ 110.3%. The experimental results indicated that the improved SDME was a simple, reliable and convenient technique and could easily be used for the enrichment of other pollutants. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 11 van 28 gevonden artikelen
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