Unchanged nitrate and nitrite isotope fractionation during heterotrophic and Fe(II)-mixotrophic denitrification suggest a non-enzymatic link between denitrification and Fe(II) oxidation.

ABSTRACT: Natural-abundance measurements of nitrate and nitrite (NO_x) isotope ratios (δ¹⁵N and δ¹⁸O) can be a valuable tool to study the biogeochemical fate of NO_x species in the environment. A prerequisite for using NO_x isotopes in this regard is an understanding of the mechanistic details of isotope fractionation (¹⁵ε, ¹⁸ε) associated with the biotic and abiotic NO_x transformation processes involved (e.g., denitrification). However, possible impacts on isotope fractionation resulting from changing growth conditions during denitrification, different carbon substrates, or simply the presence of compounds that may be involved in NO_x reduction as co-substrates [e.g., Fe(II)] remain uncertain. Here we inv

SUBMITTER: Visser AN 

PROVIDER: S-EPMC9478938 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature