@prefix cpm: . @prefix dc: . @prefix dcat: . @prefix dce: . @prefix dct: . @prefix dcterms: . @prefix grg: . @prefix iop: . @prefix ns0: . @prefix ns1: . @prefix owl: . @prefix pav: . @prefix prov: . @prefix puv: . @prefix qudt: . @prefix rdf: . @prefix rdfs: . @prefix reg: . @prefix sdo: . @prefix semapv: . @prefix skos: . @prefix sssom: . @prefix void: . @prefix xsd: . rdf:type sdo:DefinedTerm ; sdo:description "The isotopic enrichment (1000*(sample(15N/14N ratio) - natural ratio)/(natural ratio)) of nitrogen 15 in nitrate molecules (NO3-) in a body of salt or fresh water after removal of particles larger than 0.2 microns by filtration."@en ; sdo:inDefinedTermSet ; sdo:name "Enrichment of nitrogen-15 in nitrate {15N in NO3- CAS 14390-96-6} {delta(15)N} in the water body [dissolved plus reactive particulate <0.2um phase] by filtration, denitrification to N2O by cultured bacteria and Continuous-Flow Isotope Ratio Mass-Spectrometry"@en ; sdo:termCode "SDN:P01::E15NWC21" .