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Influence of soil type on TiO$_2$ nanoparticle fate in an agro-ecosystem

C. Larue 1 C. Baratange 1 D. Vantelon 2 H. Khodja 3 S. Surble 3 A. Elger 1 M. Carriere 4 
3 LEEL - UMR 3685 - Laboratoire d'Etudes des Eléments Légers
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
4 CIBEST - Chimie Interface Biologie pour l’Environnement, la Santé et la Toxicologie
SYMMES - SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé : DRF/IRIG/SYMMES
Abstract : Nanoparticles (NPs) and in particular TiO$_2$-NPs are increasingly included in commercial goods leading to their accumulation in sewage sludge which is spread on agricultural soils as fertilizers in many countries. Crop plants are thus a very likely point of entry for NPs in the food chain up to humans. So far, soil influence on NP fate has been under-investigated. In this article, we studied the partitioning of TiO$_2$-NPs between soil and soil leachate, their uptake and biotransformation in wheat seedlings and their impact on plant development after exposure on 4 different types of soil with different characteristics: soil texture (from sandy to clayey), soil pH, cationic exchange capacity, organic matter content. Results suggest that a NP contamination occurring on agricultural soils will mainly lead to NP accumulation in soil (increase of Ti concentration up to 302 % in sand) but to low to negligible transfer to soil leachate and plant shoot. In our experimental conditions, no sign of acute phytotoxicity has been detected (growth, biomass, chlorophyll content). Clay content above 6% together with organic matter content above 1.5% lead to translocation factor from soil to plant leaves below 2.5% (i.e. below 13 mg$^{-1}$ dry leaves). Taken together, our results suggest low risk of crop contamination in an agro-ecosystem.
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Submitted on : Thursday, March 1, 2018 - 11:17:02 AM
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C. Larue, C. Baratange, D. Vantelon, H. Khodja, S. Surble, et al.. Influence of soil type on TiO$_2$ nanoparticle fate in an agro-ecosystem. Science of the Total Environment, Elsevier, 2018, 630, pp.609 - 617. ⟨10.1016/j.scitotenv.2018.02.264⟩. ⟨cea-01720395⟩



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