With high performance liquid chromatography, the concentrations of α-endosulfan, DDE, parathion methyl, isoproturon, atrazine, carbaryl and carbofuran were determined in farmed raised fish Labeo rohita of two weight ...With high performance liquid chromatography, the concentrations of α-endosulfan, DDE, parathion methyl, isoproturon, atrazine, carbaryl and carbofuran were determined in farmed raised fish Labeo rohita of two weight groups. All these pesticide residues were detected in fish meat samples. All these pesticide residues except isoproturon were identified in soil sediments, whereas all these pesticide residues except isoproturon, carbaryl and DDE were also present in water samples. DDT, heptachlor, β-endosulfan, chlorpyrifos, dimethoate, captan, cypermethrin, chlorobromuron and chlorotoluron were absent in all samples of water, sediments and fish flesh. The pesticide residues levels were in order of parathion methyl 〉 DDE 〉 carbofuran 〉 atrazine 〉 α-endosulfan 〉 isoproturan 〉 carbaryl. The concentrations of pesticides were higher in fish weighing 800 -1 300 g than in those weighing 250 -750 g. The DDE was remained highest in sediments, while that was not detected in water samples. The pesticides （endosulfan, parathion methyl, atrazine and carbofuran） had crossed their MRL values （0.001 μg/g） in water samples.展开更多
This paper reports on the levels of 8 organochlorine pesticide residues and metabolites in three fish species; Tilapia （Oreochromis leucostictus）. Common carp （Cyprinus carpio） and Mirror carp （Cuprinus spectacul...This paper reports on the levels of 8 organochlorine pesticide residues and metabolites in three fish species; Tilapia （Oreochromis leucostictus）. Common carp （Cyprinus carpio） and Mirror carp （Cuprinus spectacularlus） from Lake Naivasha, Kenya. p,p＇-DDT, p,p＇-DDE, p,p＇-DDD, heptachlor, heptachlor epoxide, aldrin, dieldrin and methoxychlor were analyzed in fish specimens collected from Lake Naivasha during the months of November - December in 2008. The pesticide concentrations （in ~ag/Kg, wet weight） ranged within 0.42-4.185 p,g/Kg, for Heptachlor, BDL-0.291 Heptachlor epoxide, 0.433-4.733 Aldrin, BDL -0.341 Dieldrin, p,p＇ DDT, BDL-6.691 p,p＇ DDE, BDL-27.153 p,p＇ DDD, and BDL-28.867 methoxychlor. The pesticide residue levels varied widely between and within species. C. spectacularhts showed high pesticide levels followed by C. carpio and O. leueostictus respectively; this was attributed to the trophic position and age/size of fish. The occurrences of the pesticides indicate recent use in the catchment. The mean values and ranges of residues found in fish ware below the FAO/WHO maximum acceptable limits in fish and sea food however increased monitoring is recommended to detect any changes.展开更多
文摘With high performance liquid chromatography, the concentrations of α-endosulfan, DDE, parathion methyl, isoproturon, atrazine, carbaryl and carbofuran were determined in farmed raised fish Labeo rohita of two weight groups. All these pesticide residues were detected in fish meat samples. All these pesticide residues except isoproturon were identified in soil sediments, whereas all these pesticide residues except isoproturon, carbaryl and DDE were also present in water samples. DDT, heptachlor, β-endosulfan, chlorpyrifos, dimethoate, captan, cypermethrin, chlorobromuron and chlorotoluron were absent in all samples of water, sediments and fish flesh. The pesticide residues levels were in order of parathion methyl 〉 DDE 〉 carbofuran 〉 atrazine 〉 α-endosulfan 〉 isoproturan 〉 carbaryl. The concentrations of pesticides were higher in fish weighing 800 -1 300 g than in those weighing 250 -750 g. The DDE was remained highest in sediments, while that was not detected in water samples. The pesticides （endosulfan, parathion methyl, atrazine and carbofuran） had crossed their MRL values （0.001 μg/g） in water samples.
文摘This paper reports on the levels of 8 organochlorine pesticide residues and metabolites in three fish species; Tilapia （Oreochromis leucostictus）. Common carp （Cyprinus carpio） and Mirror carp （Cuprinus spectacularlus） from Lake Naivasha, Kenya. p,p＇-DDT, p,p＇-DDE, p,p＇-DDD, heptachlor, heptachlor epoxide, aldrin, dieldrin and methoxychlor were analyzed in fish specimens collected from Lake Naivasha during the months of November - December in 2008. The pesticide concentrations （in ~ag/Kg, wet weight） ranged within 0.42-4.185 p,g/Kg, for Heptachlor, BDL-0.291 Heptachlor epoxide, 0.433-4.733 Aldrin, BDL -0.341 Dieldrin, p,p＇ DDT, BDL-6.691 p,p＇ DDE, BDL-27.153 p,p＇ DDD, and BDL-28.867 methoxychlor. The pesticide residue levels varied widely between and within species. C. spectacularhts showed high pesticide levels followed by C. carpio and O. leueostictus respectively; this was attributed to the trophic position and age/size of fish. The occurrences of the pesticides indicate recent use in the catchment. The mean values and ranges of residues found in fish ware below the FAO/WHO maximum acceptable limits in fish and sea food however increased monitoring is recommended to detect any changes.
