Journal article
Abiotic reduction of nitrite by Fe(ii): a comparison of rates and N2O production
Environmental science--processes & impacts, Vol.23(10), pp.1531-1541
10/20/2021
DOI: 10.1039/D1EM00222H
PMID: 34515719
Abstract
Abiotic reduction of nitrite (NO2−) by Fe(ii) species (i.e., chemodenitrification) has been demonstrated in a variety of natural environments and laboratory studies, and is a potentially significant source of atmospheric nitrous oxide (N2O) emissions. It is, however, unclear how chemodenitrification rates and N2O yields vary among heterogeneous Fe(ii) species under similar conditions and whether abiotic reduction competes with biological NO2− reduction. Here, we measured rates of NO2− reduction and extents of N2O production by several Fe(ii) species under consistent, environmentally relevant conditions (i.e., pH 7.0, bicarbonate buffer, and 0.1 mM NO2−). Nitrite reduction rates varied significantly among the heterogeneous Fe(ii) species with half-lives (t1/2) ranging from as low as an hour to over two weeks following the trend of goethite/Fe(ii) ∼ hematite/Fe(ii) ∼ magnetites > maghemite/Fe(ii) > sediment/Fe(ii). Interestingly, we observed no clear trend of increasing NO2− reduction rates with higher magnetite stoichiometry (x = Fe2+/Fe3+). Nitrogen recovery as N2O also varied significantly among the Fe species ranging from 21% to 100% recovery. We further probed both chemodenitrification and biological denitrification in the absence and presence of added aqueous Fe(ii) with a sediment collected from the floodplain of an agricultural watershed. While abiotic NO2− reduction by the sediment + Fe(ii) was much slower than the laboratory Fe(ii) species, we found near complete mass N balance during chemodenitrification, as well as evidence for both abiotic and biological NO2− reduction potentially occurring in the sediment under anoxic conditions. Our results suggest that in redox active sediments and soils both chemodenitrification and biological denitrification are likely to occur simultaneously, and that agricultural watersheds may be significant sources of N2O emissions.
Details
- Title: Subtitle
- Abiotic reduction of nitrite by Fe(ii): a comparison of rates and N2O production
- Creators
- Thomas C Robinson - University of IowaDrew E Latta - University of IowaLuiza Notini - University of IowaKeith E Schilling - Iowa Geological Survey, 300 Trowbridge Hall, Iowa City, IA 52242-1319, USAMichelle M Scherer - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Environmental science--processes & impacts, Vol.23(10), pp.1531-1541
- DOI
- 10.1039/D1EM00222H
- PMID
- 34515719
- ISSN
- 2050-7887
- eISSN
- 2050-7895
- Grant note
- DOI: 10.13039/100000001, name: National Science Foundation, award: 1633098, 1708467
- Language
- English
- Date published
- 10/20/2021
- Academic Unit
- Civil and Environmental Engineering; Earth and Environmental Sciences; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984197073502771
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