Bioconcentration and half-life of quinalphos pesticide in rice-fish integration system in the Mekong Delta,Vietnam |
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| Authors: | Nguyen Quoc Thinh Tran Minh Phu Caroline Douny Nguyen Thanh Phuong Do Thi Thanh Huong Patrick Kestemont |
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| Institution: | 1. Department of Fish Nutrition and Aquatic Food Processing, College of Aquaculture and Fisheries, Can Tho University, Can Tho City, Vietnam;2. Department of Food Sciences, Laboratory of Food Analysis, FARAH – Veterinary Public Health, University of Liège, Liège, Belgium;3. Department of Food Sciences, Laboratory of Food Analysis, FARAH – Veterinary Public Health, University of Liège, Liège, Belgium;4. Research Unit in Environmental and Evolutionary Biology, University of Namur, Namur, Belgium |
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| Abstract: | 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. |
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| Keywords: | Mekong delta aquaculture rice-fish integration system pesticide quinalphos bioconcentration |
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