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Foliar or root exposures to smelter particles: Consequences for lead compartmentalization and speciation in plant leaves

Schreck, Eva and Dappe, Vincent and Sarret, Géraldine and Sobanska, Sophie and Nowak, Dorota and Nowak, Jakub and Stefaniak, Elżbieta Anna and Magnin, Valérie and Ranieri, Vincent and Dumat, Camille Foliar or root exposures to smelter particles: Consequences for lead compartmentalization and speciation in plant leaves. (2014) Science of the Total Environment, 476-477. 667-676. ISSN 0048-9697

(Document in English)

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Official URL: http://dx.doi.org/10.1016/j.scitotenv.2013.12.089


In urban areaswith high fallout of airborne particles,metal uptake by plantsmainly occurs by foliar pathways and can strongly impact crop quality. However, there is a lack of knowledge on metal localization and speciation in plants after pollution exposure, especially in the case of foliar uptake. In this study, two contrasting crops, lettuce (Lactuca sativa L.) and rye-grass (Lolium perenne L.), were exposed to Pb-rich particles emitted by a Pb-recycling factory via either atmospheric or soil application. Pb accumulation in plant leaves was observed for both ways of exposure. The mechanisms involved in Pb uptake were investigated using a combination of microscopic and spectroscopic techniques (electron microscopy, laser ablation, Raman microspectroscopy, and X-ray absorption spectroscopy). The results showthat Pb localization and speciation are strongly influenced by the type of exposure (root or shoot pathway) and the plant species. Foliar exposure is the main pathway of uptake, involving the highest concentrations in plant tissues. Under atmospheric fallouts, Pb-rich particles were strongly adsorbed on the leaf surface of both plant species. In lettuce, stomata contained Pb-rich particles in their apertures, with some deformations of guard cells. In addition to PbO and PbSO4, chemical forms that were also observed in pristine particles, newspecies were identified: organic compounds (minimum 20%) and hexagonal platy crystals of PbCO3. In rye-grass, the changes in Pb speciation were even more egregious: Pb–cell wall and Pb–organic acid complexes were the major species observed. For root exposure, identified here as a minor pathway of Pb transfer compared to foliar uptake, another secondary species, pyromorphite, was identified in rye-grass leaves. Finally, combining bulk and spatially resolved spectroscopic techniques permitted both the overall speciation and the minor but possibly highly reactive lead species to be determined in order to better assess the health risks involved.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at Science of the Total Environment website : www.sciencedirect.com/science/journal/00489697
HAL Id:hal-01585017
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National d'Études Spatiales - CNES (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
French research institutions > Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux - IFSTTAR (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Other partners > Université Grenoble Alpes - UGA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > The John Paul II Catholic University of Lublin - KUL (POLAND)
Other partners > Université Lille 1, Sciences et Technologies - Lille 1 (FRANCE)
Other partners > Université de Savoie Mont Blanc - USMB (FRANCE)
Laboratory name:
Deposited On:30 Aug 2017 13:44

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