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Bioconcentration and half-life of quinalphos pesticide in rice-fish integration system in the Mekong Delta, Vietnam Part B Pesticides, food contaminants, and agricultural wastes

Thinh, Nguyen Quoc, Phu, Tran Minh, Douny, Caroline, Phuong, Nguyen Thanh, Huong, Do Thi Thanh, Kestemont, Patrick, Scippo, Marie-Louise
Journal of environmental science and health 2018 v.53 no.1 pp. 35-41
Barbonymus gonionotus, Cyprinus carpio, bioaccumulation factor, fish, gas chromatography, half life, muscles, quinalphos, rice, river deltas, sediments, Vietnam
In order to determine the distribution and enable the elimination of quinalphos, a popular active pesticide compound used in the Mekong Delta, an experiment was set up in a rice-fish integration system in Can Tho City, Vietnam. Fish was stocked into the field when the rice was two-months old. Quinalphos was applied twice in doses of 42.5 g per 1000 m². Water, fish and sediment samples were collected at time intervals and analyzed by a Gas Chromatography Electron Capture Detector system. The results show that quinalphos residues in fish muscles were much higher than those of the water and the bioconcentration factor (logBCF) was above 2 for the fish. The half-life of first and second quinalphos applications were 12.2 and 11.1 days for sediment, 2.5 and 1.1 days for silver barb, 1.9 and 1.3 days for common carp, and 1.1 and 1.0 days for water, respectively.