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Consejo Nacional de Ciencia y Tecnología, CONACYT: 123487, 2002 C01-39663
Generically Dependent Continuant
RDF description of Galena weathering under simulated calcareous soil conditions - http://orbis.uaslp.mx/vivo/individual/scopus2843
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Anglesite; Calcareous soil; Cerussite; Galena oxidation; Surface analysis; Weathering process Anglesite; Calcareous soil; Cerussite; Galena oxidation; Weathering process; Environmental impact; Oxidation; Passivation; Phase stability; Soil mechanics; Soils; Surface analysis; Weathering; lead; lead sulfide; pyrite; zinc sulfide; calcareous soil; chemical weathering; galena; lead; mobility; oxidation; soil chemistry; toxicity; absorption; amperometry; article; chemical analysis; chemical composition; electrochemistry; environmental impact; infrared spectroscopy; leaching; mineralogy; mining; oxidation; potentiometry; priority journal; scanning electron microscopy; soil property; spectroscopy; weathering; X ray diffraction; Environmental Monitoring; Lead; Mexico; Oxidation-Reduction; Soil; Sulfides
Exploitation of polymetallic deposits from calcareous mining sites exposes galena and others sulfides to weathering factors. Galena weathering leads to the formation of lead phases (e.g., PbSO 4, PbCO 3) with a higher bioaccessibility than galena, thus increasing the mobility and toxicity of lead. Despite the environmental impacts of these lead phases, the mechanisms of galena oxidation and the transformation of lead secondary phases, under neutral-alkaline carbonated conditions, have rarely been studied. In this work, an experimental approach, combining electrochemical and spectroscopic techniques, was developed to examine the interfacial processes involved in the galena weathering under simulated calcareous conditions. The results showed an initial oxidation stage with the formation of an anglesite-like phase leading to the partial mineral passivation. Under neutral-alkaline carbonated conditions, the stability of this phase was limited as it transformed into a cerussite-like one. Based on the surface characterization and the formation of secondary species, the weathering mechanisms of galena in calcareous soil and its environmental implications were suggested. © 2011 Elsevier B.V.
Galena weathering under simulated calcareous soil conditions