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Oxygen isotopic composition (18O/16O) of nitrate. This property is reported as the relative quantity delta18O in units of per mil vs. VSMOW (Vienna Standard Mean Ocean Water)
delta 18O of NO3. d18O (? vs. VSMOW) is the oxygen isotopic composition of a sample expressed in delta notation (in units of per mil) relative to Vienna Standard Mean Ocean Water (VSMOW), where delta 18O = {[ (18O/16O)sample / (18O/16O)VSMOW ] - 1} x 1000.