Endosulfan pesticide dissipation and residue levels in khat and onion in a sub-humid region of Ethiopia

Vista sencilla de ítem
dc.creatorSishu, F. K.
dc.creatorThegaye, E. K.
dc.creatorSchmitter, Petra S.
dc.creatorHabtu, N. G.
dc.creatorTilahun, Seifu A.
dc.creatorSteenhuis, T. S.
dc.date2020
dc.date2020-05-16T08:49:18Z
dc.date2020-05-16T08:49:18Z
dc.date.accessioned2026-06-27T18:25:54Z
dc.descriptionEndosulfan, 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.
dc.identifierhttps://hdl.handle.net/10568/108267
dc.identifier.urihttp://hdl.handle.net/123456789/155627
dc.languageen
dc.publisherSpringer
dc.rightsLimited Access
dc.sourceSishu, 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)
dc.subjectpesticide application
dc.subjectendosulfan
dc.subjectpesticide residues
dc.subjectcrop production
dc.subjectcatha edulis
dc.subjectonions
dc.subjectsubhumid zones
dc.subjectwet season
dc.subjectdry season
dc.subjectfarmers
dc.titleEndosulfan pesticide dissipation and residue levels in khat and onion in a sub-humid region of Ethiopia
dc.typeConference Paper

Archivos

Colecciones

Instituto Internacional para el Manejo del Agua (IWMI)