Journal
GEOCHIMICA ET COSMOCHIMICA ACTA
Volume 267, Issue -, Pages 17-32Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.gca.2019.09.018
Keywords
Chemodenitrification; Nitrous oxide; Site preference; Nitrite; Lignin derivatives
Categories
Funding
- Chinese Scholarship Council [201406890023]
- German Federal Ministry of Education and Research (BMBF) [031A561A]
- Swiss National Science Foundation [CRSII5_170876]
- EMPAPOSTDOCS-II programme from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [754364]
- Swiss National Science Foundation (SNF) [CRSII5_170876] Funding Source: Swiss National Science Foundation (SNF)
Ask authors/readers for more resources
Chemodenitrification can be a substantial abiotic source of nitrous oxide (N2O) in soil. The isotopic signature of N2O from this process could support source partitioning, but it is currently unknown in sufficient detail. In this study, we determined the isotopic composition of N2O, produced by the reaction of nitrite (NO2-) with lignin, four lignin derivatives, and three types of soils, online with a quantum cascade laser absorption spectrometer (QCLAS). We present the first dataset of continuous measurements of delta N-15(bulk) (delta N-15(bulk) (delta N-15(alpha) + delta N-15(beta))/2), delta O-18, and site preference (SPN2O, SPN2O delta N-15(alpha) - delta N-15(beta)) of N2O from chemodenitrification in both chemical assays and soils. Considerable amounts of N2O were produced by chemical reduction of NO2-, indicating that chemodenitrification could dominate N2O emission in NO2--rich environments. The values of SPN2O varied by more than 20 parts per thousand in the reactions of sodium nitrite with organic substances. Contrary to the common assumption that SPN2O values are constant for a distinct N2O source process, our results reveal a considerable shift in SPN2O over time for most experiments. The large SPN2O variability might be explained by the multiple pathways with hyponitrous acid or nitramide as N2O precursors. These findings provide important new information to improve our understanding about the dependency of N2O isotopic signatures on N2O production processes. (C) 2019 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available