Influence of soil type on TiO2 nanoparticle fate in an agro-ecosystem

The Science of the Total Environment
C LarueM Carrière

Abstract

Nanoparticles (NPs) and in particular TiO2-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 TiO2-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 13mgTi·kg-1 dry leaves)....Continue Reading

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Citations

Mar 17, 2020·Bulletin of Environmental Contamination and Toxicology·Clement O OgunkunlePaul O Fatoba
Feb 19, 2019·Journal of Hazardous Materials·Mansi BakshiCamille Larue
Jul 28, 2021·Environmental Science & Technology·Kohei SakataHiroshi Tanimoto
Oct 20, 2018·Environmental Science & Technology·Vinita VijayarajCamille Larue

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