ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Cyanogenic Chromobacterium violaceum, Pseudomonas fluorescens, and P.plecoglossicida were able to mobilize silver, gold and platinum when grown in the presence ofvarious metal-containing solids such as powdered platinum, platinum-containing automobilecatalytic converters, powdered silver, or gold-containing electronic scrap. Five percent of silver wasmobilized from powdered jewelry scrap as dicyanoargentate after one day, although 96% wasmobilized when non-biological cyanide leaching was applied. Dicyanoargentate proved to inhibitgrowth at concentrations 〉20 mg/L. Gold was microbially solubilized from electronic scrap(shredded printed circuit boards). Maximum dicyanoaurate concentration corresponded to a 68.5%dissolution of the total gold added. Additionally, cyanide-complexed copper was detected duringtreatment of electronic scrap due to its high copper content of approximately 100 g/kg scrap. Smallamounts of platinum were mobilized from pure platinum powder after 10 days. The process provedto be very slow. In summary, all findings demonstrate the potential of microbial mobilization ofmetals as cyanide complex from solid materials and represent a novel type of microbial metalmobilization which might find industrial application
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.20-21.50.pdf
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