Interactions of pesticides with fresh - water algae 1. Effect of methomyl and its possible degradation by Phormidium fragile
Titel:
Interactions of pesticides with fresh - water algae 1. Effect of methomyl and its possible degradation by Phormidium fragile
Auteur:
Khalil, Zeinab Mostafa, I. Y.
Verschenen in:
Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes
Paginering:
Jaargang 21 (1986) nr. 4 pagina's 289-301
Jaar:
1986
Inhoud:
The insecticide methomyl showed no significant effect on the growth of the fresh-water alga Phormidium fragile up to a concentration of 112.5 ppm. However, at higher concentrations inhibition was observed. Biochemical analysis showed a gradual decrease in all nitrogen fractions, total carbohydrate content, chlorophyll a and carotenes contents. Furthermore, a considerable decrease in the amount of both soluble and insoluble phosphorus fractions was also observed. The organism was capable of degrading 48.6% of the applied radiolabelled insecticide of which only 0.1% of 14C-activity was trapped as 14CO2 . Furthermore, the chloroform and aqueous fractions contained 50.4% and 35.0%, respectively of the initial radioactivity. Thin-layer Chromatographic analysis showed the presence of three metabolites of methomyl one of which was identified as the oxime.
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