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Recent environmental change in North African wetland lakes: a baseline study of organochlorine contaminant residues in sediments from nine sites in the CASSARINA Project
Authors:AJ Peters  KC Jones  RJ Flower  PG Appleby  M Ramdani  MM Kraïem  AA Fathi
Institution:(1) Department of Environmental Science, Lancaster University, Lancaster, LA1 4YQ, UK;(2) Environmental Change Research Centre, University College, London, 26 Bedford Way, London, WCIH OAP, UK;(3) Department of Theoretical Physics and Applied Mathematics, University of Liverpool, Liverpool, L69 3BX, UK;(4) Department Zoologie, Institut Scientifique, Charia Ibn Baotota, Rabat, Morocco;(5) Institut National des Sciences & Technologies de la Mer (INSTM), Salammbô, Tunisia;(6) Botany Department, University of El Minia, El Minia, Egypt;(7) Present address: Centre for Ecology and Hydrology, Winfrith Technology Centre, Dorchester, Dorset, DT2 8ZD, UK
Abstract:Sediment from 9 lakes and lagoons in 3 North African countries was analysed for a suite of organochlorine insecticides and polychlorinated biphenyls (PCBs). Residues of gamma-HCH and ppprime-DDE were detected in most cores, and radiometric dating of the sediment enabled time profiles to be constructed which are indicative of recent use of the insecticide lindane and previous use of the insecticide DDT in the region. Absolute concentrations of these pesticides were relatively low compared to reported values for other world-wide locations, but exceeded recommended Canadian and Dutch environmental quality standards at several sites. Maximum fluxes of gamma-HCH and ppprime-DDE (190 and 95 mgrg m–2 yr–1, respectively) were relatively high and comparable to some sediments in North America and the United Kingdom. Other organochlorine pesticides including dieldrin were detected at low levels in some samples. Selected PCB congeners were detected at trace levels at 2 sites only, indicating low levels of industrial contamination at the sampling locations. Tropical and sub-tropical regions of the world have been suggested to be contemporary sources of globally distributed organochlorine contaminants. These data are discussed with respect to this hypothesis.
Keywords:pesticides  wetlands  sediments  HCH  DDT  PCB  North Africa
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