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delta 15N (d15N) is a measure of the ratio of stable isotopes 15N:14N. It is commonly reported in parts per thousand (per mil, 0/00).
Delta 15N scale contraction in Model 1, which prescribes 10 nmol nitrate aliquots, an O atom exchange fraction of 3%, a mean bacterial blank of 0.06 nmol N, an atomspheric N2O concentration of 0.013 nmol N mL-1, and a contaminant blank of 0.016 nmol N mL-1 in the reference solution