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Type: Artigo de periódico
Title: Arsenic mobilization from sulfidic materials from gold mines in Minas Gerais State
Author: Andrade, Renato Pereira de
Santana Filho, Salomão
Mello, Jaime Wilson Vargas de
Figueiredo, Bernardino Ribeiro de
Dussin, Tânia Mara
Abstract: Acid drainage results from exposition of sulfides to the atmosphere. Arsenopyrite is a sulfide that releases arsenic (As) to the environment when oxidized. This work evaluated the As mobility in six sulfidic geomaterials from gold mining areas in Minas Gerais State, Brazil. Grained samples (<2 mm) were periodically leached with distilled water, during 70 days. Results suggested As sorption onto (hydr)oxides formed by oxidation of arsenopyrite. Low pH accelerated the acid generation, dissolving Fe oxihydroxides and releasing As. Presence of carbonates decreased oxidation rates and As release. On the other hand, lime added to a partially oxidized sample increased As mobilization.
Subject: arsenopyrite
acid mine drainage
Editor: Sociedade Brasileira de Química
Rights: aberto
Identifier DOI: 10.1590/S0100-40422008000500037
Date Issue: 1-Jan-2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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