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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/hess-2018-377
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-2018-377
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 23 Aug 2018

Research article | 23 Aug 2018

Review status
This discussion paper is a preprint. A revision of the manuscript was accepted for the journal Hydrology and Earth System Sciences (HESS).

A conceptual model of organochlorine fate from a combined analysis of spatial and mid/long-term trends of surface and ground water contamination in tropical areas (FWI)

Philippe Cattan1,2, Jean-Baptiste Charlier3, Florence Clostre4,5, Philippe Letourmy6,7, Luc Arnaud8, Julie Gresser9, and Magalie Jannoyer10 Philippe Cattan et al.
  • 1CIRAD, UPR GECO, Montpellier, F-34398, France
  • 2GECO, Univ Montpellier, CIRAD, Montpellier, France
  • 3BRGM, Univ. Montpellier, Montpellier, F-34000, France
  • 4CIRAD, UPR HortSys, Le Lamentin, F-97285, Martinique, France
  • 5HortSys, Univ Montpellier, CIRAD, Montpellier, France
  • 6CIRAD, UPR AIDA, Montpellier, F-34398, France
  • 7AIDA, Univ Montpellier, CIRAD, Montpellier, France
  • 8BRGM, Fort-de-France, F-97200, Martinique, France
  • 9ODE, Fort-de-France, F-97201, Martinique, France
  • 10CIRAD, DGDRS, Montpellier, F-34398, France

Abstract. In this study, we investigated the management of long-term environmental pollution by organic pollutants such as organochlorine pesticides. We set out to identify conditions that are conducive to reducing pollution levels for these persistent molecules and then propose a conceptual model of organochlorine fate in water. Our approach looked at spatio-temporal changes in pollutant contents in surface water (SW) and groundwater (GW) on a large scale, in order to decipher the respective roles of soil, geology, hydrology and past treatment practices. The case of chlordecone (CLD) on the island of Martinique (1,100km2) was selected given the sampling campaigns carried out since 2007 over more than 150 sites. CLD, its metabolite chlordecone-5b-hydro (5bCLD) and the metabolite/parent compound ratio were compared. As regards the spatial variability of water contamination, our results showed that banana cropping areas explained the location of contaminated SW and GW, whereas the combination of soil and geology factors explained the main spatial variability in the 5bCLD/CLD ratio. For temporal variability, these conditions defined a high diversity of situations in terms of the duration of pollution, highlighting two groups: water draining old geology & ferralsols or vertisols vs. recent geology & andosols. A theoretical leaching model provided some key information to help interpret downward trends in CLD and 5bCLD observed in water. Lastly, a conceptual model of organochlorine fate is proposed to explain the diversity of the 5bCLD/CLD ratio in water. Our conclusions highlight the combined role of soil and groundwater residence time for differentiating between conditions that are more conducive, or not, to the disappearance of CLD from the environment. This paper presents a model that provides an overall perception of organochlorine pesticide fate in the environment.

Philippe Cattan et al.
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Philippe Cattan et al.
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We investigated the management of long-term environmental pollution by organochlorine pesticides. We selected the case of chlordecone on the island of Martinique. We propose a conceptual model of organochlorine fate accounting for physical conditions relative to soils and geology. This model explains pollution variability in water but also the dynamics of pollution trends. It helps to identify risky areas where pollution will last for a long time and where more attention is needed.
We investigated the management of long-term environmental pollution by organochlorine...
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