Endosulfan pesticide dissipation and residue levels in khat and onion in a sub-humid region of Ethiopia
Endosulfan, a mixture of a- and ß-isomers, is used by farmers in the wet and dry season for khat and onion production. Khat leaf samples were collected in farmer fields at intervals of 1 h; 1, 5, 9 and 14 d after application. The dissipation rate of a- and ß-isomers and residue level in khat were co...
| Autores principales: | , , , , , |
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| Formato: | Conference Paper |
| Lenguaje: | Inglés |
| Publicado: |
Springer
2020
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/108267 |
| _version_ | 1855516825573392384 |
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| author | Sishu, F. K. Thegaye, E. K. Schmitter, Petra S. Habtu, N. G. Tilahun, Seifu A. Steenhuis, T. S. |
| author_browse | Habtu, N. G. Schmitter, Petra S. Sishu, F. K. Steenhuis, T. S. Thegaye, E. K. Tilahun, Seifu A. |
| author_facet | Sishu, F. K. Thegaye, E. K. Schmitter, Petra S. Habtu, N. G. Tilahun, Seifu A. Steenhuis, T. S. |
| author_sort | Sishu, F. K. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Endosulfan, a mixture of a- and ß-isomers, is used by farmers in the wet and dry season for khat and onion production. Khat leaf samples were collected in farmer fields at intervals of 1 h; 1, 5, 9 and 14 d after application. The dissipation rate of a- and ß-isomers and residue level in khat were compared with residue levels in onion. The extraction was done by using Quick Easy Cheap Effective Rugged and Safe (QuEChERS) method and analyzed by Gas Chromatography – Electron Capture Detector (GC-ECD). Greater residue a- and ß-isomer endosulfan levels were found in khat compared to onion as khat leaves are sprayed repeatedly in two week. Residue levels of khat exceeded the tolerable EU limit of 0.05 mg.kg-1 for leafy vegetables and herbs. For both raw and processed onion sample a- and ßendosulfan residues level were below the tolerable of limit EU regulation for bulb vegetables (i.e. 0. 1 mg.kg-1). The mean half-life for the a-isomer of endosulfan was 3.4 d in the wet season and 3.6 d in the dry season whilst that for the ß-isomer was 5.0 d and 5.4 d respectively. Both isomers dissipated fastest in the wet season under conditions of high humidity and precipitation. The ß-isomer persisted longer and had a lower dissipation rate from plants surface compared to the a-isomer. |
| format | Conference Paper |
| id | CGSpace108267 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | CGSpace1082672025-10-14T15:09:09Z Endosulfan pesticide dissipation and residue levels in khat and onion in a sub-humid region of Ethiopia Sishu, F. K. Thegaye, E. K. Schmitter, Petra S. Habtu, N. G. Tilahun, Seifu A. Steenhuis, T. S. pesticide application endosulfan pesticide residues crop production catha edulis onions subhumid zones wet season dry season farmers Endosulfan, a mixture of a- and ß-isomers, is used by farmers in the wet and dry season for khat and onion production. Khat leaf samples were collected in farmer fields at intervals of 1 h; 1, 5, 9 and 14 d after application. The dissipation rate of a- and ß-isomers and residue level in khat were compared with residue levels in onion. The extraction was done by using Quick Easy Cheap Effective Rugged and Safe (QuEChERS) method and analyzed by Gas Chromatography – Electron Capture Detector (GC-ECD). Greater residue a- and ß-isomer endosulfan levels were found in khat compared to onion as khat leaves are sprayed repeatedly in two week. Residue levels of khat exceeded the tolerable EU limit of 0.05 mg.kg-1 for leafy vegetables and herbs. For both raw and processed onion sample a- and ßendosulfan residues level were below the tolerable of limit EU regulation for bulb vegetables (i.e. 0. 1 mg.kg-1). The mean half-life for the a-isomer of endosulfan was 3.4 d in the wet season and 3.6 d in the dry season whilst that for the ß-isomer was 5.0 d and 5.4 d respectively. Both isomers dissipated fastest in the wet season under conditions of high humidity and precipitation. The ß-isomer persisted longer and had a lower dissipation rate from plants surface compared to the a-isomer. 2020 2020-05-16T08:49:18Z 2020-05-16T08:49:18Z Conference Paper https://hdl.handle.net/10568/108267 en Limited Access Springer Sishu, F. K.; Thegaye, E. K.; Schmitter, Petra; Habtu, N. G.; Tilahun, S. A.; Steenhuis, T. S. 2020. Endosulfan pesticide dissipation and residue levels in khat and onion in a sub-humid region of Ethiopia. In Habtu, N. G.; Ayele, D. W.; Fanta, S. W.; Admasu, B. T.; Bitew, M. A. (Eds.). Advances of science and technology. Proceedings of the 7th EAI International Conference on Advancement of Science and Technology (ICAST 2019), Bahir Dar, Ethiopia, 2-4 August 2019. Cham, Switzerland: Springer. pp.16-28. (Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering (LNICST) Volume 308) |
| spellingShingle | pesticide application endosulfan pesticide residues crop production catha edulis onions subhumid zones wet season dry season farmers Sishu, F. K. Thegaye, E. K. Schmitter, Petra S. Habtu, N. G. Tilahun, Seifu A. Steenhuis, T. S. Endosulfan pesticide dissipation and residue levels in khat and onion in a sub-humid region of Ethiopia |
| title | Endosulfan pesticide dissipation and residue levels in khat and onion in a sub-humid region of Ethiopia |
| title_full | Endosulfan pesticide dissipation and residue levels in khat and onion in a sub-humid region of Ethiopia |
| title_fullStr | Endosulfan pesticide dissipation and residue levels in khat and onion in a sub-humid region of Ethiopia |
| title_full_unstemmed | Endosulfan pesticide dissipation and residue levels in khat and onion in a sub-humid region of Ethiopia |
| title_short | Endosulfan pesticide dissipation and residue levels in khat and onion in a sub-humid region of Ethiopia |
| title_sort | endosulfan pesticide dissipation and residue levels in khat and onion in a sub humid region of ethiopia |
| topic | pesticide application endosulfan pesticide residues crop production catha edulis onions subhumid zones wet season dry season farmers |
| url | https://hdl.handle.net/10568/108267 |
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