<p>The data contained herein are associated with the manuscript, "The contamination of commercial 15N2 gas stocks with 15N-labeled nitrate and ammonium and consequences for nitrogen fixation measurements", which is available at PLOS ONE.</p>
<p>We report on the presence of 15N-labeled nitrate/nitrite, ammonium, and nitrous oxide in commercial 15N2 gas and the enrichment of particulate nitrogen as a result of the biological assimilation of 15N labeled contaminants.</p
