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En Afrique, plusieurs familles de pesticides, susceptibles de nuire a la sante de l’homme et de l’environnement, sont utilisees contre les pestes et autres nuisibles. Cependant, la plupart des etudes menees se sont focalisees sur les organochlores. La frequence de detection et les concentrations des pesticides aldicarbe et crimidine ont ete examinees dans les eaux et les sediments autour de la decharge municipale d’Akouedo (Cote d’Ivoire). Les analyses ont ete effectuees de juin 2013 a janvier 2014 par chromatographie liquide a haute performance couplee a la methode de detection par fluorescence, apres une extraction liquide/liquide des eaux, et une extraction au soxhlet des sediments. Les resultats ont montre une contamination significative des sediments par l’aldicarbe et la crimidine a des frequences de detection tres elevees, contrairement aux eaux lagunaires et souterraines. Les concentrations ont ete significativement plus elevees pendant la saison des crues dans les eaux et pendant la saison des pluies dans les sediments. Ces resultats suggerent que la crimidine est utilisee ou rejetee de facon illegale dans la zone d’etude, et que les niveaux de concentration de la crimidine et de l’aldicarbe dans la baie de M’Badon peuvent causer des risques de sante pour certains organismes aquatiques et les populations. © 2016 International Formulae Group. All rights reserved. Mots cles: Pesticides; lixiviat, estuaire, lagune Ebrie, Cote d’Ivoire English Title:  Aldicarb and crimidine in waters and sediments in the vicinity of the Akouedo municipal dumping site (Abidjan, Cote d’Ivoire): concentrations and detection frequencies English Abstract The impact of pesticides on environmental quality is of great concern in many developing countries. However, data on pesticide contamination levels in African estuaries has mainly focused on organochlorine compounds, although some among other pesticide families are able to persist in water for several days and pose toxicological risks to humans and wildlife. This study assessed the detection frequency and concentration levels of aldicarb and crimidine residues in waters and sediments (from leachate, pits, and M’Badon Bay) around the municipal dumping site of Akouedo (Abidjan, Ivory Coast). Samples were analyzed by the HPLCfluorescence detector method after liquid/liquid and soxhlet extractions of waters and sediments, respectively, from June 2013 to January 2014. The results showed significant contamination of sediments by the aldicarb and the crimidine, with detection frequencies up to 100% during the wet season. The highest pesticide concentrations in waters and sediments were observed during the flooding season and the wet season, respectively. The aldicarb and crimidine concentrations were significantly higher in sediments than waters, although they are highly soluble in water. The results suggest that the crimidine is illegally used or disposed of in Abidjan area, and that aldicarbe and crimidine concentration levels could pose health risks to biota. © 2016 International Formulae Group. All rights reserved. Keywords: Pesticides; leachate, estuary, Ebrie Lagoon, Ivory Coast

international journal of biological and chemical sciences

Aldicarbe et crimidine dans les eaux et les sédiments aux alentours de la décharge municipale d’Akouédo (Abidjan, Côte d’Ivoire): niveaux et fréquences de contamination