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Physico-chimie de micro particules pour la prévision de la spéciation du plomb, du zinc et du cadmium dans des aérosols de pollution atmosphérique

Abstract : Currently, industrial smelters are an important source of metal-containing particles in the atmosphere. Industrial activities emit fine particles of PbSO4, ZnSO4 and CdSO4 which represent an important toxicological risk for respiratory tract. Laboratory simulations in aerosol chamber working in turbulent conditions allowed the formation of aggregates between MSO4 (M=Pb, Zn, Cd) industrial microparticles and calcite (CaCO3) dusts. PbSO4-CaCO3 aggregates have been observed in particulate matter (PM10 and PM2,5) sampled in the vicinity of industrial smelters. Morphology and chemistry of MSO4-CaCO3 aggregates have been investigated by Raman imaging, environmental scanning electron microscope (ESEM) and TOF S-SIMS according to the relative humidity variation. CdSO4-CaCO3 aggregates when exposed to a supersaturated H2O atmosphere lead to the formation of CdCO3 and CaSO4, 2H2O as fine particles. Cd is mainly found as CdSO4.xH2O (x=8/3,1) in the aggregate. In the same way, humidity induces the formation of Zn4SO4(OH)6, Zn5(OH)6(CO3)2 and ZnSO4.xH2O (x= 7.1) as a thin layer at the particle interface. In contrast, in the sanie conditions, PbSO4-CaCO3 aggregates form rapidly fine particles of Pb3(CO3)2(OH)2, PbCO3 and CaSO4.2H2O. The speciation of Pb, Zn, Cd in MSO4-CaCO3 aggregates have been interpreted in regards to thermodynamic equilibria and the dissolution rate of calcite. The findings of the present work are different from the reported results concerning the uptake of Pb2+, Zn2+, Cd2+ traces by calcite in continental water.
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Guillaume Falgayrac. Physico-chimie de micro particules pour la prévision de la spéciation du plomb, du zinc et du cadmium dans des aérosols de pollution atmosphérique. Autre. Université des Sciences et Technologie de Lille - Lille I, 2006. Français. ⟨tel-00282871⟩

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