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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 2. Based on Model 1, Model 2 increased the bacterial blank to the maximum observed values of 0.16 nmol N and a contaminant blank in the reference solution to 0.027 nmol N mL-1