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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 of PN (permil vs. air-N2) analytical uncertainty 0.2 permil (prefiltered with 202um mesh screen onto combusted 25mm GF/F; filters not acidified before analysis)