Présentations Colloques

    Oral Presentation
    5.04
    Session 5.04: Emerging contaminants in the water cycle and risk to Groundwater
    Le Coadou Laurine
    Emerging contaminants in rainwater as a possible source of groundwater contamination : How to implement a robust long-range sampling strategy of rainwater ?
    The objective of this study is to better understand the potential contribution of emerging contaminants (e.g. pesticides, perfluoroalkyl substances, artificial sweeteners) in groundwaters via dry and wet atmospheric deposition. This can help assessing the possible transfer of organic contaminants in the water cycle and more precisely their introduction pathways at the interface rainwater soil-groundwater. The achievement of this objective requires to select and to implement robust methodologies regarding sampling and analysis. The two major difficulties to face are (1) the representativeness of samples due to the heterogeneity of the considered acidic matrix (inorganic compounds, metals, microbial activity) and (2) the potential risk of external contamination. **In this study, two types of semi-automatic rainwater collectors were chosen to sample bulk deposition (i.e. dry and wet depositions simultaneously) and dry and wet depositions separately. This strategic choice is linked to a lack of knowledge regarding occurrence of emerging contaminants in dry atmospheric deposition, whereas it has been shown to be non-negligible for pesticides [1]. Both devices have a refrigerated cabinet to ensure the good preservation of samples. The collectors are composed of well-known inert materials (i.e. PTFE, glass) to avoid any external contamination. The use of an innovative wireless system for data communication allows a remote continuous monitoring of the device, and more flexibility in the collection protocol. Robust sampling methodologies which ensure reliable results are achieved with the use of a wide range of blanks at each step of the protocol, from the installation of the device to the shipment of samples. In this study, we focus on atmospheric deposition in 6 sites with distinct geographical and climatic characteristics, depending on the local rainwater seasonality, which reinforce the spatial and temporal representativeness. It finally enables to anticipate the risks undergone by groundwaters when considering rainwater as a possible source of contamination.****[1]Sauret, N.+ Wortham, H.+ Strekowski, R.+ Herckès, P.+ Nieto, L. I. Environmental Pollution 2009, 157, 303.
    France

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