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The stability of tetrathioantimonate in the presence of oxygen, light, high temperature and arsenic

Title data

Planer-Friedrich, Britta ; Wilson, Nathaniel:
The stability of tetrathioantimonate in the presence of oxygen, light, high temperature and arsenic.
In: Chemical Geology. Vol. 322–32 (2012) . - pp. 1-10.
ISSN 0009-2541
DOI: https://doi.org/10.1016/j.chemgeo.2012.06.010

Abstract in another language

The recent development of methods to measure thioantimonate species, and their discovery in natural waters, means knowledge regarding their preservation is essential to understand their role in natural systems. We show that thioantimonate species can be preserved for more than three weeks if they are flash-frozen and/or stored in anoxic, dark conditions. When tetrathioantimonate is exposed to oxygen, light, or temperatures greater than room temperature, it transforms partially to trithioantimonate, but mainly to antimonite or antimonate. Thioantimonate formation and stability increases with increasing ionic strength. Compared to the thio species of arsenic, an element in the same group on the periodic table, thioantimonates are kinetically more labile. Excess arsenic decreases the percentage of thioantimonate species formed and favours formation of trithioantimonate over tetrathioantimonate. Excess antimonite decreases thioarsenate formation which is indicative of competition between the two metalloids for available sulfide. Sequestration of sulfur from thioarsenate to antimonite was not observed. In direct competition for sulfide, thioantimonate species form faster than thioarsenates. As an extension to previous reports from alkaline hot springs in Yellowstone National Park, thioantimonate species have now also been observed in mildly acidic conditions (pH 5-6) in New Zealand´s Champagne Pool. In natural waters, the proportion of thioantimonates in total antimony is considerably lower than thioarsenates in total arsenic, probably because they are kinetically more labile.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER100431
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/12758