Fate of pristine TiO2 nanoparticles and aged paint-containing TiO2 nanoparticles in lettuce crop after foliar exposure

Larue Camille, Castillo-Michel Hiram, Sobanska Sophie, Trcera Nicolas, Sorieul Stephanie, Cécillon Lauric, Ouerdane Laurent, Legros Samuel, Sarret Géraldine. 2014. Fate of pristine TiO2 nanoparticles and aged paint-containing TiO2 nanoparticles in lettuce crop after foliar exposure. Journal of Hazardous Materials, 273 : 17-26.

Quartile : Outlier, Sujet : ENGINEERING, CIVIL / Quartile : Q1, Sujet : ENVIRONMENTAL SCIENCES / Quartile : Q1, Sujet : ENGINEERING, ENVIRONMENTAL

Résumé : Engineered TiO2 nanoparticles (TiO2-NPs) are present in a large variety of consumer products, and are produced in largest amount. The building industry is a major sector using TiO2-NPs, especially in paints. The fate of NPs after their release in the environment is still largely unknown, and their possible transfer in plants and subsequent impacts have not been studied in detail. The foliar transfer pathway is even less understood than the root pathway. In this study, lettuces were exposed to pristine TiO2-NPsand aged paint leachate containing TiO2-NPs and microparticles (TiO2-MPs). Internalization and in situ speciation of Ti were investigated by a combination of microscopic and spectroscopic techniques. Not only TiO2-NPs pristine and from aged paints, but also TiO2-MPs were internalized in lettuce leaves, and observed in all types of tissues. No change in speciation was noticed, but an organic coating of TiO2-NPsis likely. Phytotoxicity markers were tested for plants exposed to pristine TiO2-NPs. No acute phytotoxicity was observed; variations were only observed in glutathione and phytochelatin levels but remained low as compared to typical values. These results obtained on the foliar uptake mechanisms of nano-and microparticles are important in the perspective of risk assessment of atmospheric contaminations.

Classification Agris : U30 - Méthodes de recherche
P02 - Pollution
Q03 - Contamination et toxicologie alimentaires
F01 - Culture des plantes

Champ stratégique Cirad : Axe 3 (2014-2018) - Alimentation durable

Auteurs et affiliations

• Larue Camille, Université Joseph Fourier (FRA)
• Castillo-Michel Hiram, ESRF (FRA)
• Sobanska Sophie, Université Lille 1 (FRA)
• Trcera Nicolas, SOLEIL synchrotron (FRA)
• Sorieul Stephanie, Université de Bordeaux I (FRA)
• Cécillon Lauric, Université Joseph Fourier (FRA)
• Ouerdane Laurent, CEA (FRA)
• Legros Samuel, CIRAD-PERSYST-UPR Recyclage et risque (FRA)
• Sarret Géraldine, Université Joseph Fourier (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/574845/)

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