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| Titel: |
Analytical and kinetic study of the aqueous hydrolysis of four organophosphorus and two carbamate pesticides |
| Auteur: |
Zamy, Cecile Mazellier, Patrick Legube, Bernard |
| Verschenen in: |
International journal of environmental analytical chemistry |
| Paginering: | Jaargang 84 (2004) nr. 14-15 pagina's 1059-1068 |
| Jaar: |
2004-12-10 |
| Inhoud: |
The hydrolysis of six selected pesticides has been studied in aqueous solution. Four organophosphorus pesticides (disulfoton, isofenfos, isazofos and profenfos) and two N-methylcarbamate derivatives (oxamyl and ethiofencarb) were selected. Hydrolysis was performed in purified buffered water at different pH in the range 7.0-10.0 (ionic strength = 2.5 mM, T = 25°C). At pH = 8.0, isofenfos and disulfoton (t1/2 ≈ 4 years, t1/2 ≈ 1 year, resp.) were found to be far more stable than isazofos (t1/2 ≈ 5 months), ethiofencarb and profenofos (t1/2<1 month), themselves more stable than oxamyl (t1/2 ≈ 1 day). As expected, a strong dependence on pH was observed for all pesticides: the rate of degradation increased when the pH increased. Degradation products were identified by GC-MS and/or LC-MS. Possible structures are presented in the article. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 1 van 9 gevonden artikelen
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