Fate of pristine TiO2nanoparticles and aged paint-containing TiO2nanoparticles in lettuce crop after foliar exposure

LARUE ; MICHEL ; SOBANSKA ; TRCERA ; SORIEUL ; CECILLON ; OUERDANE ; LEGROS ; SARRET

Type de document
ARTICLE A COMITE DE LECTURE REPERTORIE DANS BDI (ACL)
Langue
anglais
Auteur
LARUE ; MICHEL ; SOBANSKA ; TRCERA ; SORIEUL ; CECILLON ; OUERDANE ; LEGROS ; SARRET
Résumé / Abstract
Engineered TiO2nanoparticles (TiO2-NPs) are present in a large variety of consumer products, and areproduced 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 trans-fer in plants and subsequent impacts have not been studied in detail. The foliar transfer pathway iseven 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 situspeciation of Ti were investigated by a combination of microscopic and spectroscopic techniques. Notonly TiO2-NPs pristine and from aged paints, but also TiO2-MPs were internalized in lettuce leaves, andobserved 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 phytotoxi-city was observed; variations were only observed in glutathione and phytochelatin levels but remainedlow as compared to typical values. These results obtained on the foliar uptake mechanisms of nano- andmicroparticles are important in the perspective of risk assessment of atmospheric contaminations.
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