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Título del libro: One Century Of The Discovery Of Arsenicosis In Latin America (1914-2014): As 2014 - Proceedings Of The 5th International Congress On Arsenic In The Environment
Título del capítulo: Geochemistry of arsenic in a historical mining zone of Mexico

Autores UNAM:
MARIA AURORA ARMIENTA HERNANDEZ;
Autores externos:

Idioma:
Inglés
Año de publicación:
2014
Palabras clave:

Aquifers; Arsenic; Environmental impact; Limestone; Sediments; Water pollution; Acid mine drainage; Arsenic mobilization; Geochemical barriers; Geochemical behaviors; Geochemical process; Laboratory experiments; Mineralized zone; River sediments; Geochemistry


Resumen:

Results from 20 years of research on the sources, distribution and environmental impact of As in the Mexican mining zone of Zimapán have been analyzed to determine the main environmental geochemical processes controlling its mobility. Arsenic geochemical behavior was assessed based on detailed chemical, isotopic and mineralogical determinations. Oxidation and dissolution of As-bearing minerals release As in mineralized zones of the deep aquifer and in tailings. Arsenic mobilization in tailings is partly controlled by sorption and secondary minerals formation. In soils, tailings, and river sediments, most of the As is present in low-mobility forms. Presence of limestone plays a major role in the geochemical behavior of As by increasing the pH, retain As and promote Fe-oxyhidroxides formation. Laboratory experiments showed that indigenous limestone sorbs As and may be used to clean As polluted water, and to construct geochemical barriers to treat acid mine drainage. © 2014 Taylor Francis Group.


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