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Interference of Nitrite with Pyrite under Acidic Conditions : Implications for Studies of Chemolithotrophic Denitrification

Title data

Yan, Ruiwen ; Kappler, Andreas ; Peiffer, Stefan:
Interference of Nitrite with Pyrite under Acidic Conditions : Implications for Studies of Chemolithotrophic Denitrification.
In: Environmental Science & Technology. Vol. 49 (2015) Issue 19 . - pp. 11403-11410.
ISSN 0013-936X
DOI: https://doi.org/10.1021/acs.est.5b02981

Abstract in another language

Chemolithotrophic denitrification coupled to pyrite oxidation is regarded a key process in the removal of nitrate in aquifers. A common product is nitrite, which is a strong oxidant under acidic conditions. Nitrite may thus interfere with Fe(II) during acidic extraction, a procedure typically used to quantify microbial pyrite oxidation, in overestimating Fe(III) production. We studied the reaction between pyrite (5–125 mM) and nitrite (40–2000 μM) at pH 0, 5.5, and 6.8 in the absence and presence of oxygen. Significant oxidation of pyrite was measured at pH 0 with a yield of 100 μM Fe(III) after 5 mM pyrite was incubated with 2000 μM nitrite for 24 h. Dissolved oxygen increased the rate at pH 0. No oxidation of pyrite was observed at pH 5.5 and 6.8. Our data imply a cyclic model for pyrite oxidation by Fe(III) on the basis of the oxidation of residual Fe(II) by NO and NO2. Interference by nitrite could be avoided if nitrite was removed from the pyrite suspensions through a washing procedure prior to acidic extraction. We conclude that such interferences should be considered in studies on microbially mediated pyrite oxidation with nitrate.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER131280
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology > Chair Hydrology - Univ.-Prof. Dr. Stefan Peiffer
Research Institutions
Research Institutions > Research Centres
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
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 05 Aug 2016 07:43
Last Modified: 05 Aug 2016 07:43
URI: https://eref.uni-bayreuth.de/id/eprint/33835