A Comparison Of Organochlorine Pesticide Residues In Upper Ncema And Lower Umguza Dams, Zimbabwe.
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Date
1996
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Applied Science in Southern Africa
Abstract
This study examined the levels of chlorinated hydrocarbons (organochloride
pesticides) in the ecosystem of Ncema and Umguza dams. Samples of water,
water weeds, mud and fish were collected from each dam. The fish species
collected from the two dams were river sardine (Mesobo/a brevianus), branded
bream (Tilapia sparmanii), African catfish (e/arias gariepinus) and red-breasted
bream (Tilapia rendelli). The samples were analysed for hexachlorocyclohexane,
DDT, and its metabolites, DOE and DOD, aldrin and dieldrin. DDT was detected in
all the samples, its concentration ranging from 1,12 J.l9 per kg in water weeds to
265 J.l9 per kg in mud from Upper Ncema dam. Aldrin was also detected in all the
samples (except for branded bream from Upper Ncema dam), the highest level
__being 223 ~g per kg in_ ~atdln~$'-rom Lower Umguza dam. Traces.of
hexachlorocyclohexane were detected in some of the samples, the highest level
of 20,1 ~g per kg in African catfish from Upper Ncema dam. Dieldrin was detected
only in mud samples from Lower Umguza dam at a concentration of 80,5 ~g per
kg. Overall, this study indicates that Upper Ncema dam has a higher pesticide load
compared to Lower Umguza dam.
Description
Journal article from page 26 to 30.
Keywords
Pesticide, organochlorine, residues
Citation
Siwela, Andrew H., Marufu, G. and Mhlanga, A.T.(1996) A comparison of organochlorine pesticide residues in Upper Ncema and Lower Umguza Dams, Zimbabwe. Journal of Applied Science in Southern Africa