@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 "An in situ UV absorption spectrophotometer that measures nitrate concentrations in the ocean. The sensor is rated to either 500 m or 6000 m. It uses a Xenon flash lamp as a light source and has a path length of either 70 mm or 200 mm, permitting nitrate detection up to 400 uM or 100 uM, respectively. The minimum nitrate detection limit is 0.2 uM and accuracy is +/- 0.2 uM. Nitrate concentrations are determined from the ratio of the absorption at 220 nm and 280 nm. The sensor was developed by NOC in association with Valeport Ltd."@en ; sdo:inDefinedTermSet ; sdo:name "National Oceanography Centre Nitrate Sensor SUV6"@en ; sdo:termCode "SDN:L22::TOOL0370" .