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TZUNTIL:20161030T010000Z
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DTSTART:20131027T030000
TZOFFSETFROM:+0200
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RDATE:20141026T030000
RDATE:20151025T030000
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DTSTART:20140330T020000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t119653id
DTSTAMP:20260408T224201Z
DESCRIPTION:The fate of contaminants such as heavy metals and sorbents in h
 eterogeneous environmental systems such as soils or biofilms is often cont
 rolled by (redox-) reactions\, mineral precipitation / dissolution / trans
 formation processes\, or by the sorption to surface functional groups.\nAn
 alysis on the bulk scale hide (sub-)-micron heterogeneities and often fail
  at the identification of intermediate products that appear at low concent
 rations only. These drawbacks often limit a fundamental process understand
 ing. Novel analysis approaches that combine chemical sensitivity with high
  spatial resolution and innovative concepts for data analysis can help to 
 identify these processes and the underlying mechanisms.\nIn this talk I wi
 ll present several examples wherein novel and innovative\, spatially resol
 ved analysis approaches were required to understand environmental redox pr
 ocesses and the fate of contaminants such as Cd and As. These methods incl
 ude synchrotron-based scanning transmission X-ray microscopy (STXM) that p
 rovides analytical capabilities such as speciation- and quantitative chemi
 cal mapping of environmental samples at ~20-30 nm spatial resolution. Furt
 hermore\, the talk will include examples of analytical electron microscopy
  and confocal laser scanning microscopy in biogeochemical research\, as we
 ll as innovative concepts and software tools for data analysis. The follow
 ing examples will be presented:\n\nInfluence of submicron-scale heterogene
 ities in biogenic Fe-minerals on the sorption of arsenate – the importance
  of microbial extracellular polymers. \nSorption of heavy metals/metalloid
 s to cell-mineral aggregates formed by Fe-oxidizing bacteria. \nSoil remed
 iation with Cd hyper-accumulating plants – new insights into the influence
  of microbial Fe-reduction on the fate of Cd in contaminated soils. \n\n 
 \n***\nInvited by Stefan Peiffer\, Department of Hydrology
DTSTART;TZID=Europe/Berlin:20141016T000000
DTEND;TZID=Europe/Berlin:20141016T235959
SUMMARY:Dr. Martin Obst\, Environmental Analytical Microscopy\, Universität
  Tübingen (Homepage): Innovative approaches in experimental biogeochemistr
 y - analytics on the sub-micron scale for a better process understanding
TRANSP:TRANSPARENT
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