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An a Priori Index to Discriminate Contaminated Wasteland of Concern From the Ones Ready to Be Upgraded to an Ecological Usage

Abstract : The future of urban and industrial wasteland is at the heart of environmental, social and economic issues. They have specific characteristics (structure, composition) which are constraints for biodiversity and the biological functioning of soils. However, an abandoned wasteland (whose soil functions were not altered beyond repair) ends up hosting transitional ecosystems with ecological value. Brownfield requalification operations most often come up against difficulties linked to the presence of pollutants (in most cases metallic) at the heart of the issues linked to degraded land. The French national methodology for the management of polluted sites and soils includes carrying out a study of health and environmental risks to assess whether a site is in a state compatible with its future use. When the health aspect is not a major issue (no housing project for example), the objectives of decontamination and / or restoration of soil quality must be based on an ecological risk assessment (ERA). These are generally not or not sufficiently applied, either for financial reasons or for lack of competence issues. The Tipomo project (transfer and index of concern: tools for valuing medium-contaminated wasteland) aims to construct an index of concern that allows the classification of polluted soils hosting transitional ecosystems. The question is to differentiate the soils which are candidates for immediate upgrading to an ecological usage (biodiversity reserve) from those which need an ERA. Applicable only on plots with significant vegetation, the index will be calculated by considering the levels of soil impregnation and its ability to trap polluting substances (characterization of bioavailability fraction). The method will be tested in a case study by comparing the interpretation of the index to the result of a bioassay battery (which take into account the mixture effect). This approach follows the general thinking behind the ERA Triad (ISO 19204) by using simultaneously chemical tools, ecotoxicological information and ecological observation. For the purpose of this work, the implementation of the TRIAD is simplified, leading to an index of “concern” rather than a risk index. The Tipomo field studies have started in June 2020. They will support the definition of the principles of the method and its use in applied regulatory context.
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Submitted on : Wednesday, June 30, 2021 - 10:13:22 AM
Last modification on : Thursday, October 28, 2021 - 4:32:10 PM


  • HAL Id : ineris-03274461, version 1


Nicolas Pucheux, Nicolas Manier, Delphine Boulant-Cirederf, Olivier Faure, Jean-François Nau, et al.. An a Priori Index to Discriminate Contaminated Wasteland of Concern From the Ones Ready to Be Upgraded to an Ecological Usage. 31. SETAC Europe annual meeting, Jun 2021, Online, Belgium. ⟨ineris-03274461⟩



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