1 Introduction ................................................ 15
2 Geochemical characterization of and microbial enrichments
and isolations from the Cd-contaminated field sites
Langelsheim, Stutenkamm, and Rodacherbrunn in Germany ....... 27
3 Fate of Cd during microbial Fe(III) mineral reduction by
a novel and Cd-tolerant Geobacter species ................... 47
4 Organic carbon and reducing conditions lead to cadmium
immobilization by secondary Fe mineral formation in a
pH-neutral soil ............................................. 67
5 Microbial shifts depending on the distance to the roots of
the cadmium-hyper-accumulating plant Arabidopsis halleri .... 85
6 Presence of soil microorganisms stimulates cadmium
accumulation in the metal-hyperaccumulating plant
Arabidopsis halleri ........................................ 105
7 Biogenic Fe(III) minerals lower the efficiency of iron
mineral-based commercial filter systems for arsenic
removal .................................................... 131
8 Are rice (Oryza sativa L.) phosphate transporters
regulated similarly by phosphate and arsenate? -
a comprehensive study ...................................... 151
9 Fate of arsenic during microbial reduction of biogenic
versus abiogenic As-Fe(III)-mineral coprecipitates ......... 179
8 Arsenic redox transformation and As binding to secondary
Fe minerals formed during microbial reduction of
arsenic(V)-bearing biogenic Fe(III)(oxyhydr)oxides .......... 197
11 Summary and outlook ........................................ 211
Statement of personal contribution ............................ 215
Curriculum vitae .............................................. 219
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