Degradation catalytique du chlorfenvinphos et du methidathion deposes sur kaolinite et bentonite saturees par differents cations
Titel:
Degradation catalytique du chlorfenvinphos et du methidathion deposes sur kaolinite et bentonite saturees par differents cations
Auteur:
Camara, M. A. Navarro, M. Garcia, S. Navarro Barba, A. Coste, C-M.
Verschenen in:
Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes
Paginering:
Jaargang 27 (1992) nr. 3 pagina's 293-306
Jaar:
1992-06
Inhoud:
The catalytic degradation of chlorfenvinphos and methidathion on H+, Ca+2, Na+ and ?+ monoionic kaolinite and bentonite was investigated. The results showed that the decomposition of chlorfenvinphos was greater than methidathion in both clays. The extent of degradation was influenced by the nature of the exchange cations and its degree hydration, in the following sequence: K+ >Na+ >Ca+2 >H+/A1+3. In both clays the process of hydrolysis occurred in two stages involving first-order kinetics of differents hydrolysis rates. The first stage consisted a high hydrolysis rate of short duration and the second had a slow rate but involved a continuous hydrolysis.