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Chemical and isotopic tracers combined with mixing models for tracking nitrate contamination in the Pampa de Pocho aquifer, Argentina
In recent years, it has become evident that human activities have significantly disrupted the
nitrogen cycle surpassing acceptable environmental thresholds. In this study, chemical and …
nitrogen cycle surpassing acceptable environmental thresholds. In this study, chemical and …
Assessment of international reference materials for isotope-ratio analysis (IUPAC Technical Report)
Since the early 1950s, the number of international measurement standards for anchoring
stable isotope delta scales has mushroomed from 3 to more than 30, expanding to more …
stable isotope delta scales has mushroomed from 3 to more than 30, expanding to more …
Oxygen exchange between (de)nitrification intermediates and H2O and its implications for source determination of NO and N2O: a review
Stable isotope analysis of oxygen (O) is increasingly used to determine the origin of nitrate
(NO) and nitrous oxide (N2O) in the environment. The assumption underlying these studies …
(NO) and nitrous oxide (N2O) in the environment. The assumption underlying these studies …
Tracing anthropogenic inputs of nitrogen to ecosystems
Nitrate (NO3−) concentrations in public water supplies have risen above acceptable levels
in many areas of the world, largely as a result of overuse of fertilizers and contamination by …
in many areas of the world, largely as a result of overuse of fertilizers and contamination by …
Hadal biosphere: insight into the microbial ecosystem in the deepest ocean on Earth
Hadal oceans at water depths below 6,000 m are the least-explored aquatic biosphere. The
Challenger Deep, located in the western equatorial Pacific, with a water depth of∼ 11 km, is …
Challenger Deep, located in the western equatorial Pacific, with a water depth of∼ 11 km, is …
Chemical conversion of nitrate and nitrite to nitrous oxide for nitrogen and oxygen isotopic analysis in freshwater and seawater
We present a novel method for nitrogen and oxygen natural isotopic abundance analysis of
nitrate and nitrite of seawater and freshwater at environmental concentrations. The method …
nitrate and nitrite of seawater and freshwater at environmental concentrations. The method …
N2 production rates limited by nitrite availability in the Bay of Bengal oxygen minimum zone
A third or more of the fixed nitrogen lost from the oceans as N2 is removed by anaerobic
microbial processes in open ocean oxygen minimum zones. These zones have expanded …
microbial processes in open ocean oxygen minimum zones. These zones have expanded …
Isotopic overprinting of nitrification on denitrification as a ubiquitous and unifying feature of environmental nitrogen cycling
Natural abundance nitrogen and oxygen isotopes of nitrate (δ15NNO3 and δ18ONO3)
provide an important tool for evaluating sources and transformations of natural and …
provide an important tool for evaluating sources and transformations of natural and …
The Contamination of Commercial 15N2 Gas Stocks with 15N–Labeled Nitrate and Ammonium and Consequences for Nitrogen Fixation Measurements
We report on the contamination of commercial 15-nitrogen (15N) N2 gas stocks with 15N-
enriched ammonium, nitrate and/or nitrite, and nitrous oxide. 15N2 gas is used to estimate …
enriched ammonium, nitrate and/or nitrite, and nitrous oxide. 15N2 gas is used to estimate …
Nitrogen and oxygen isotope fractionation during dissimilatory nitrate reduction by denitrifying bacteria
We report the first measurements of coupled nitrogen (N) and oxygen (O) isotope
fractionation of nitrate by laboratory cultures of denitrifying bacteria. Two seawater strains …
fractionation of nitrate by laboratory cultures of denitrifying bacteria. Two seawater strains …