Spatial distribution of heavy metals in the surface soil of source-control stormwater infiltration devices - Inter-site comparison

Abstract : Stormwater runoff infiltration brings about some concerns regarding its potential impact on both soil and groundwater quality; besides, the fate of contaminants in source-control devices somewhat suffers from a lack of documentation. The present study was dedicated to assessing the spatial distribution of three heavy metals (copper, lead, zinc) in the surface soil of ten small-scale infiltration facilities, along with several physical parameters (soil moisture, volatile matter, variable thickness of the upper horizon). High-resolution samplings and in-situ measurements were undertaken, followed by X-ray fluorescence analyses and spatial interpolation. Highest metal accumulation was found in a relatively narrow area near the water inflow zone, from which concentrations markedly decreased with increasing distance. Maximum enrichment ratios amounted to > 20 in the most contaminated sites. Heavy metal patterns give a time-integrated vision of the non-uniform infiltration fluxes, sedimentation processes and surface flow pathways
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Damien Tedoldi, Ghassan Chebbo, Daniel Pierlot, Philippe Branchu, Yves Kovacs, et al.. Spatial distribution of heavy metals in the surface soil of source-control stormwater infiltration devices - Inter-site comparison. Science of the Total Environment, Elsevier, 2017, 〈10.1016/j.scitotenv.2016.10.226〉. 〈hal-01403964〉

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