@article{971,
  author = {J. Granger and D.M. Sigman and M.G. Prokopenko and M.F. Lehmann and P.D. Tortell},
  title = {A method for nitrite removal in nitrate N and O isotope analyses},
  abstract = {We describe a method to remove nitrite from seawater and freshwater samples to determine the nitrogen (N) and oxygen (O) isotopic composition of nitrate in aqueous samples (15N/14N and 18O/16O, respectively). This method is simple, inexpensive, and effective in the removal of nitrite without compromising the natural N and O isotopic composition of nitrate. Moreover, the method is nontoxic and compatible with the "denitrifier method" for nitrate N and O isotope analysis. Nitrite is removed from solution by reduction to nitric oxide (NO) gas using ascorbic acid at a pH of  3.5. The NO produced is continually degassed with an inert gas during the reaction, preventing O2 from reacting with NO to form new nitrate. Nitrate N and O isotope ratios were measured with the denitrifier method. The precision of isotope measurements of nitrate by the denitrifier method after nitrite removal averaged {\textpm}0.34{\textperthousand} for 15N/14N and {\textpm}0.39{\textperthousand} for 18O/16O. {\textcopyright} 2014, by the Association for the Sciences of Limnology and Oceanography.},
  year = {2006},
  journal = {Limnology and Oceanography: Methods},
  volume = {4},
  number = {7},
  pages = {205-212},
  publisher = {American Society of Limnology and Oceanography Inc.},
  url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33748704056\&doi=10.4319\%2flom.2006.4.205\&partnerID=40\&md5=22153381ddf80089dbb2db394c79b4e8},
  doi = {10.4319/lom.2006.4.205},
  note = {ps_limited_html},
}