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Study of lead phytoavailability for atmospheric industrial micronic and sub-micronic particles in relation with lead speciation |
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| Authors: | G. Uzu C. Dumat |
| Affiliation: | a EcoLab UMR 5245 CNRS-INPT-UPS, ENSAT BP 32607 Auzeville Tolosane, 31326 Castanet Tolosan, France b LASIR UMR 8516, Université des Sciences et Technologies de Lille, Bâtiment C5, 59655 Villeneuve d'Ascq Cedex, France c Chemical Metal Treatment Company, STCM, 30-32 chemin de Fondeyre, 31200 Toulouse, France |
| Abstract: | Particles from channelled emissions of a battery recycling facility were size-segregated and investigated to correlate their speciation and morphology with their transfer towards lettuce. Microculture experiments carried out with various calcareous soils spiked with micronic and sub-micronic particles (1650 ± 20 mg Pb kg−1) highlighted a greater transfer in soils mixed with the finest particles. According to XRD and Raman spectroscopy results, the two fractions presented differences in the amount of minor lead compounds like carbonates, but their speciation was quite similar, in decreasing order of abundance: PbS, PbSO4, PbSO4·PbO, α-PbO and Pb0. Morphology investigations revealed that PM2.5 (i.e. Particulate Matter 2.5 composed of particles suspended in air with aerodynamic diameters of 2.5 μm or less) contained many Pb nanoballs and nanocrystals which could influence lead availability. The soil-plant transfer of lead was mainly influenced by size and was very well estimated by 0.01 M CaCl2 extraction. |
| Keywords: | Lead PM2.5 and PM10 Soil-lettuce transfer Phytoavailability |
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