{"id":10131,"date":"2016-11-15T21:59:30","date_gmt":"2016-11-15T21:59:30","guid":{"rendered":"https:\/\/www.darkenergybiosphere.org\/?post_type=publication&#038;p=10131"},"modified":"2016-11-15T21:59:30","modified_gmt":"2016-11-15T21:59:30","slug":"constraining-the-role-of-iron-in-environmental-nitrogen-transformations-dual-stable-isotope-systematics-of-abiotic-no2%e2%88%92-reduction-by-feii-and-its-production-of-n2o","status":"publish","type":"publication","link":"https:\/\/www.darkenergybiosphere.org\/publication\/constraining-the-role-of-iron-in-environmental-nitrogen-transformations-dual-stable-isotope-systematics-of-abiotic-no2%e2%88%92-reduction-by-feii-and-its-production-of-n2o\/","title":{"rendered":"Constraining the role of iron in environmental nitrogen transformations: Dual stable isotope systematics of abiotic NO2\u2212 reduction by Fe(II) and its production of N2O"},"content":{"rendered":"<p>Despite mounting evidence for biogeochemical interactions between iron and nitrogen, our understanding of their environmental importance remains limited. Here we present an investigation of abiotic nitrite (NO<sub>2<\/sub><sup>\u2212<\/sup>) reduction by Fe(II) or \u2018chemodenitrification\u2019, and its relevance to the production of nitrous oxide (N<sub>2<\/sub>O), specifically focusing on dual (N and O) isotope systematics under a variety of environmental conditions. We observe a range of kinetic isotope effects that are regulated by reaction rates, with faster rates at higher pH (\u223c8), higher concentrations of Fe(II) and in the presence of mineral surfaces. A clear non-linear relationship between rate constant and kinetic isotope effects of NO<sub>2<\/sub><sup>\u2212<\/sup>reduction was evident (with larger isotope effects at slower rates) and is interpreted as reflecting the dynamics of Fe(II)\u2013N reaction intermediates. N and O isotopic composition of product N<sub>2<\/sub>O also suggests a complex network of parallel and\/or competing pathways. Our findings suggest that NO<sub>2<\/sub><sup>\u2212<\/sup> reduction by Fe(II) may represent an important abiotic source of environmental N<sub>2<\/sub>O, especially in iron-rich environments experiencing dynamic redox variations. This study provides a multi-compound, multi-isotope framework for evaluating the environmental occurrence of abiotic NO<sub>2<\/sub><sup>\u2212<\/sup> reduction and N<sub>2<\/sub>O formation, helping future studies constrain the relative roles of abiotic and biological N<sub>2<\/sub>O production pathways.<\/p>\n","protected":false},"template":"","tags":[],"publication_type":[19],"_links":{"self":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication\/10131"}],"collection":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication"}],"about":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/types\/publication"}],"wp:attachment":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/media?parent=10131"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/tags?post=10131"},{"taxonomy":"publication_type","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication_type?post=10131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}