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Thioarsenate transformation by filamentous microbial mats thriving in an alkaline, sulfidic hot spring

Title data

Härtig, Cornelia ; Planer-Friedrich, Britta:
Thioarsenate transformation by filamentous microbial mats thriving in an alkaline, sulfidic hot spring.
In: Environmental Science & Technology. Vol. 46 (2012) Issue 8 . - pp. 4348-4356.
ISSN 0013-936X
DOI: https://doi.org/10.1021/es204277j

Abstract in another language

Thioarsenates dominate arsenic speciation in sulfidic geothermal waters, yet little is known about their fate in the environment. At Conch Spring, an alkaline hot spring in Yellowstone National Park, trithioarsenate transforms to arsenate under increasingly oxidizing conditions along the drainage channel, accompanied by an initial increase, then decrease of monothioarsenate and arsenite. On-site incubation tests were conducted using sterile-filtered water with and without addition of filamentous microbial mats from the drainage channel to distinguish the role of abiotic and biotic processes for arsenic species transformation. Abiotically, trithioarsenate was desulfidized to arsenate coupled to sulfide oxidation. Monothioarsenate, however, was inert. Biotic incubations proved that the intermediate accumulation of arsenite in the drainage channel is microbially catalyzed. In the presence of sulfide, microbially enhanced sulfide oxidation coupled to reduction of arsenate to arsenite could simply enhance abiotic desulfidation of trithioarsenate and potentially also monothioarsenate. However, we were also able to show, in sulfide-free medium, direct microbial transformation of monothioarsenate to arsenate. Some arsenite formed intermediately, which was subsequently also microbially oxidized to arsenate. This study is the first evidence for microbially mediated thioarsenate species transformation by (hyper)thermophilic prokaryotes.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER103244
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group > Professorship Environmental Geochemistry - Univ.-Prof. Dr. Britta Planer-Friedrich
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 05 May 2015 12:10
Last Modified: 05 May 2015 12:10
URI: https://eref.uni-bayreuth.de/id/eprint/12751