Nitrogen Isotope Composition of Thermally Produced NOx from Various Fossil-Fuel Combustion Sources

Environmental Science & Technology
Wendell W WaltersGreg Michalski

Abstract

The nitrogen stable isotope composition of NOx (δ(15)N-NOx) may be a useful indicator for NOx source partitioning, which would help constrain NOx source contributions in nitrogen deposition studies. However, there is large uncertainty in the δ(15)N-NOx values for anthropogenic sources other than on-road vehicles and coal-fired energy generating units. To this end, this study presents a broad analysis of δ(15)N-NOx from several fossil-fuel combustion sources that includes: airplanes, gasoline-powered vehicles not equipped with a three-way catalytic converter, lawn equipment, utility vehicles, urban buses, semitrucks, residential gas furnaces, and natural-gas-fired power plants. A relatively large range of δ(15)N-NOx values was measured from -28.1‰ to 8.5‰ for individual exhaust/flue samples that generally tended to be negative due to the kinetic isotope effect associated with thermal NOx production. A negative correlation between NOx concentrations and δ(15)N-NOx for fossil-fuel combustion sources equipped with selective catalytic reducers was observed, suggesting that the catalytic reduction of NOx increases δ(15)N-NOx values relative to the NOx produced through fossil-fuel combustion processes. Combining the δ(15)N-NOx measure...Continue Reading

References

Feb 28, 2009·Environmental Science & Technology·Martine M SavardElise Rioux-Paquette
Apr 1, 1947·Journal of the Chemical Society·H C UREY
Nov 22, 2014·Analytical Chemistry·Dorothy L FibigerRichard E Peltier
Jan 27, 2015·Environmental Science & Technology·Wendell W WaltersGreg Michalski

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Citations

Dec 18, 2016·The Journal of Chemical Physics·Wendell W Walters, Greg Michalski
May 4, 2017·Environmental Science & Technology·Zhongjie Yu, Emily M Elliott
Apr 22, 2017·Rapid Communications in Mass Spectrometry : RCM·Justin G CoughlinEmily M Elliott
Jan 29, 2019·The Science of the Total Environment·Emily M ElliottJustin G Coughlin
Mar 27, 2021·Isotopes in Environmental and Health Studies·Duncan V MifsudRob J S Wilson
Oct 28, 2020·Environmental Science & Technology·Zheng ZongGan Zhang
Oct 20, 2021·The Science of the Total Environment·Chenjun DuJun Zhang

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