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Título del libro: Water-Rock Interaction - Proceedings Of The 13th International Conference On Water-Rock Interaction, Wri-13
Título del capítulo: Transformations of lead minerals in carbonate rich solutions and their implications on lead bioaccessible fractions in calcareous soils

Autores UNAM:
ROBERTO SOTERO BRIONES MENDEZ;
Autores externos:

Idioma:
Inglés
Año de publicación:
2010
Palabras clave:

Acidic streams; Bioaccessibility; Calcareous material; Calcareous soils; ELectrochemical methods; Iron sulfide; Mine tailings; Secondary phasis; Carbonate minerals; Deposits; Gypsum; Soils; Tailings; Weathering


Resumen:

The stability of lead phases in mine tailings is often disturbed by acidic streams produced during iron sulfide weathering. Although, in gypsum- and/or calcite-rich deposits acidity is buffered, lead mobility is thought to be small during galena oxidation due to the formation of anglesite-like phases. However, both the dispersion of lead and an increase of its bioaccessibility have been observed for this kind of deposits and the soils formed on them due to progressive transformation of secondary phases such as cerussite. Hence, we evaluated the anglesite-cerussite transformations by electrochemical methods in order to describe the evolution of galena under semi-alkaline high carbonated conditions associated with calcareous materials or soils. © 2010 Taylor & Francis Group, London.


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