Ntow W.J., Drechsel P., Botwe B.O., Kelderman P., Gijzen H.J.
CSIR Water Research Inst., P.O.Box AH 38, Achimota, Ghana; West Africa Office, International Water Management Inst., Accra, Ghana; Univ. of Ghana, Chemistry Dep., Legon, Ghana; UNESCO-IHE Inst. for Water Education, Westvest 7, 2611 AX Delft, Netherlands; UNESCO Jakarta Office, Regional Bureau for Science for Asia and Pacific, JI. Galuh II, Kebayoran Baru, Jakarta 12110, Indonesia
Ntow, W.J., CSIR Water Research Inst., P.O.Box AH 38, Achimota, Ghana; Drechsel, P., West Africa Office, International Water Management Inst., Accra, Ghana; Botwe, B.O., Univ. of Ghana, Chemistry Dep., Legon, Ghana; Kelderman, P., UNESCO-IHE Inst. for Water Education, Westvest 7, 2611 AX Delft, Netherlands; Gijzen, H.J., UNESCO Jakarta Office, Regional Bureau for Science for Asia and Pacific, JI. Galuh II, Kebayoran Baru, Jakarta 12110, Indonesia
A study of two small streams at Akumadan and Tono, Ghana, was undertaken during the rain and dry season periods between February 2005 and January 2006 to investigate the impact of vegetable field runoff on their quality. In each stream we compared the concentration of current-use pesticides in one site immediately upstream of a vegetable field with a second site immediately downstream. Only trace concentrations of endosulfan and chlorpyrifos were detected at both sites in both streams in the dry season. In the wet season, rain-induced runoff transported pesticides into downstream stretches of the streams. Average peak levels in the streams themselves were 0.07 μg L -1 endosulfan, 0-02 μg L-1 chlorpyrifos (the Akumadan stream); 0.04 μg L-1 endosulfan, 0.02 μg L-1 chlorpyrifos (the Tono stream). Respective average pesticide levels associated with streambed sediment were 1.34 and 0.32 μg kg-1 (the Akumadan stream), and 0.92 and 0.84 μg kg-1 (the Tono stream). Further investigations are needed to establish the potential endosulfan and chlorpyrifos effects on aquatic invertebrate and fish in these streams. Meanwhile measures should be undertaken to reduce the input of these chemicals via runoff. Copyright © 2008 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America. All rights reserved.
Animals; Pesticides; Stream flow; Water quality; Chlorpyrifos; Endosulfan; Streambed sediments; Vegetable field runoff; Agricultural runoff; chlorpyrifos; endosulfan; environmental chemical; pesticide; agricultural land; aquatic environment; article; chemical environment; concentration (parameters); crop production; environmental impact; fish; Ghana; invertebrate; nonhuman; rural area; seasonal variation; sediment; stream (river); vegetable; water contamination; water pollution; water quality; Agriculture; Chlorpyrifos; Endosulfan; Environmental Monitoring; Geologic Sediments; Ghana; Insecticides; Rivers; Seasons; Vegetables; Water Movements; Water Pollutants, Chemical; Invertebrata