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Branchet P., Cadot Emmanuelle, Fenet H., Sebag David, Ngatcha B. N., Borrell-Estupina V., Ngoupayou J. R. N., Kengne I., Braun Jean-Jacques, Gonzalez C. (2018). Polar pesticide contamination of an urban and peri-urban tropical watershed affected by agricultural activities (Yaoundé, Center Region, Cameroon). Environmental Science and Pollution Research, 25 (18), 17690-17715. ISSN 0944-1344

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Titre
Polar pesticide contamination of an urban and peri-urban tropical watershed affected by agricultural activities (Yaoundé, Center Region, Cameroon)
Année de publication2018
Type de documentArticle référencé dans le Web of Science WOS:000436879200043
AuteursBranchet P., Cadot Emmanuelle, Fenet H., Sebag David, Ngatcha B. N., Borrell-Estupina V., Ngoupayou J. R. N., Kengne I., Braun Jean-Jacques, Gonzalez C.
SourceEnvironmental Science and Pollution Research, 2018, 25 (18), p. 17690-17715. ISSN 0944-1344
RésuméUrban agriculture is crucial to local populations, but the risk of it contaminating water has rarely been documented. The aim of this study was to assess pesticide contamination of surface waters from the Mefou watershed (Yaounde, Cameroon) by 32 selected herbicides, fungicides, and insecticides (mainly polar) according to their local application, using both grab sampling and polar organic compounds integrative samplers (POCIS). Three sampling campaigns were conducted in the March/April and October/November 2015 and June/July 2016 rainy seasons in urban and peri-urban areas. The majority of the targeted compounds were detected. The quantification frequencies of eight pesticides were more than 20% with both POCIS and grab sampling, and that of diuron and atrazine reached 100%. Spatial differences in contamination were evidenced with higher contamination in urban than peri-urban rivers. In particular, diuron was identified as an urban contaminant of concern because its concentrations frequently exceeded the European water quality guideline of 0.200 mu g/L in freshwater and may thus represent an ecological risk due to a risk quotient > 1 for algae observed in 94% of grab samples. This study raises concerns about the impacts of urban agriculture on the quality of water resources and to a larger extent on the health of the inhabitants of cities in developing countries.
Plan de classementPollution [038] ; Sciences du monde végétal [076] ; Urbanisation et sociétés urbaines [102]
Descr. géo.AFRIQUE SUBSAHARIENNE ; CAMEROUN ; YAOUNDE
LocalisationFonds IRD [F B010073190]
Identifiant IRDfdi:010073190
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010073190

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