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Carazo, E.* ; Constenla, M.A.* ; Fuentes, G.* ; Moza, P.N.

Studies of methamidophos-C-14 in Costa Rican vegetables and soils.

Chemosphere 13, 939-946 (1984)

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Open Access Gold möglich sobald Verlagsversion bei der ZB eingereicht worden ist.

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In order to see the effect of time lapse between the last application of methamidophos and harvesting insecticide was applied on lettuce plants (6,84 μCi in one experiment and 4,03 μCi in the other experiment). Analysis of the crops harvested 3 days after last application showed 9,7 ppm residues on leaves, while crops harvested 1 day after application showed residues of 12,7 ppm (25% more). Treatment of tomato plants (39,65 μCi, 1,01 kg/ha) gave residues in fruits 4,92 ppm after 8 days interval between last application and harvesting. 40 days gap between the last application and harvesting leaved residues of 0,7 ppm in fruits which is much less as recommended by FAO/WHO (1 - 2 ppm). Degradation of this insecticide is dependent on the matrix of the soil, this breakdown is observed in the first ten days and than after it remains constant. C-14 radioactivity extracted from soil and plant analysis was methamidophos (92%).

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