Montag, 28. Oktober 2013, 16:30 - 18:00 iCal
Aktuelle Themen in den Umweltgeowissenschaften III
Prof. Dr. Andreas Kappler "Microbial formation and transformation of iron minerals and the consequences for the fate of trace metals in the environment"
Eberhard Clar-Saal (2B 204), Center for Earth Sciences (Althanstrasse 14, UZA II)
Althanstrasse 14, UZA II, 1090 Wien
Seminar, Workshop, Kurs
The two most important redox states of iron in the environment are Fe(II) [ferrous iron] and Fe(III) [ferric iron]. Dissolved Fe(II), relatively soluble Fe(II) minerals and poorly soluble Fe(III) minerals are abundant in pH-neutral soils and sediments. Redox transformation of iron, i.e. either reduction of Fe(III) to Fe(II) or oxidation of Fe(II) to Fe(III), is used by many microorganisms to produce energy and to grow and leads either to dissolution, transformation or precipitation of iron minerals. This presentation will give an overview about iron redox transformations catalyzed by neutrophilic microaerophilic, nitrate-reducing and even phototrophic Fe(II)-oxidizing as well as by Fe(III)-reducing microorganisms. I will then discuss the implications of these iron minerals transforming processes for the fate of trace metals such as nickel, cadmium and arsenic using examples from laboratory experiments with cultures of Fe(II)-oxidizing bacteria as well as from field studies in soils and drinking water filters.
Veranstalter
Kontakt
Andreas Gondikas
Universität Wien
Umweltgeowissenschaften
0043 1 4277 53371
andreas.gondikas@univie.ac.at
Erstellt am Freitag, 25. Oktober 2013, 08:52
Letzte Änderung am Freitag, 25. Oktober 2013, 11:51