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From bioavailability to risk assessment of polluted soil using snails: link between excess transfer and inhibition of sexual maturation

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Abstract

An accurate assessment of the environmental risk of soils contaminated by metal(loid)s (MEs) requires quantifying exposure and knowing the toxicity of contaminants transferred to biota. For this purpose, two indices have been developed with the bioindicator Cantareus aspersus to assess exposure (SET: sum of the excess of transfer) and risk (ERITME: evaluation of the risk of the transferred metal elements) of multi-contaminated soils. If the SET and ERITME indices allow characterization of exposure and risk based on unspecific toxicity points, then the link between these indices and real effects on some toxicological endpoints, such as growth or sexual maturation, remains to be demonstrated. For this purpose, sub-adult snails were exposed for 28 days to 38 ME-contaminated soils. Relationships between the SET and/or ERITME indices and health alterations in C. aspersus were determined using Spearman correlations, linear regressions, univariate regression trees, and kinetic models. Relationships were determined between the values of the SET and ERITME indices, bioaccumulation as an indicator of ME bioavailability, and the alteration in physiological endpoints, such as the shell development used as a non-invasive indicator of sexual maturation. The results enabled the determination of three levels of risk according to the differences in reaching sexual maturity: no risk, uncertain, and proven risk depended on whether the value of ERITME was below, in, or beyond the interval [2574–22720], respectively. This study provides the first benchmarks with the SET and ERITME indices to interpret the risk of contaminated soils to snails and to relate the environmental and toxicological bioavailability of ME mixtures.

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Data are available upon request from the authors.

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Acknowledgments

The authors warmly thank Nadia Morin-Crini and Caroline Amiot for their technical assistance for ME analysis. In addition, the authors thank reviewers for their careful review and their constructive remarks that lead to improve the quality of our article.

Funding

This study was funded by the Agence De l’Environnement et de la Maîtrise de l’Energie (ADEME) through the research programme COMBINE (Coupler des indicateurs chiMiques et Biologiques pour évaluation Intégrative des risques sanitaires et Environnementaux) (Grant number 1572C0310).

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Contributions

M.L.: conceptualization, formal analysis, investigation, writing—original draft, writing—review and editing; Q.D.: conceptualization, formal analysis, methodology, investigation, visualization, writing—original draft; F.G.: conceptualization, methodology, resources, writing—review and editing; B.P.: conceptualization, writing—review and editing, funding acquisition; D.R.: investigation; A.de. V.: conceptualization, formal analysis, investigation, writing—original draft, writing—review and editing, supervision, project administration, funding acquisition.

Corresponding author

Correspondence to Maxime Louzon.

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Invertebrate animals used for this study do not require specific approval from the ethical committee.

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The authors declare that they have no conflict of interest.

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Responsible Editor: Philipp Garriguess

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Louzon, M., Devalloir, Q., Gimbert, F. et al. From bioavailability to risk assessment of polluted soil using snails: link between excess transfer and inhibition of sexual maturation. Environ Sci Pollut Res 28, 17343–17354 (2021). https://doi.org/10.1007/s11356-020-11556-8

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  • DOI: https://doi.org/10.1007/s11356-020-11556-8

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