The reductive dissolution of jarosites by Shewanella Putrefaciens: A potential pathway for metal mobilization in the environmentExport this event to calendar

Thursday, December 15, 2011 — 3:30 PM EST

Dr. Christina M. Smeaton

Everyone welcome!

Refreshments Provided

Large quantities of jarosites (MFe3(SO4)2(OH)6) are produced in the zinc industry to remove impurities during the extraction process and may contain toxic metals such as lead (Pb), thallium (Tl) and arsenic (As). Jarositic wastes are often confined to capped tailings ponds, thereby, creating the potential for anaerobic reductive dissolution by microbial populations. However, despite the environmental relevance of jarosite minerals, few studies have evaluated the abiotic or biotic dissolution of jarosites under anaerobic circumneutral conditions. Batch experiments were conducted to examine the influence of a model metal reducing bacterium, Shewanella putrefaciens CN32, on the potential mobilization of Tl, As and Pb during the reductive dissolution of a variety of synthetic and natural jarosites. I will use the results from these studies to examine the role of metal biogeochemistry (i.e. Fe, Tl, Pb and As) and mineral structure on the susceptibility of jarosites to reductive dissolution by S. putrefaciens.

 
Location 
EIT - Centre for Environmental and Information Technology
room 3142
200 University Ave West

Waterloo, ON N2L 3G1
Canada

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