http://vocab.lternet.edu/vocab/vocab/http://vocab.lternet.edu/vocab/vocab/skos/397oxygen http://vocab.lternet.edu/vocab/vocab/skos/397 dissolved oxygen NT http://vocab.lternet.edu/vocab/vocab/skos/397 nitrous oxide NT http://vocab.lternet.edu/vocab/vocab/skos/397 nitrate NT http://vocab.lternet.edu/vocab/vocab/skos/397 nitrite NT http://vocab.lternet.edu/vocab/vocab/skos/397 carbon dioxide NT http://vocab.lternet.edu/vocab/vocab/skos/397 carbon monoxide NT http://vocab.lternet.edu/vocab/vocab/skos/397 ozone NT http://vocab.lternet.edu/vocab/vocab/skos/397 silica NT http://vocab.lternet.edu/vocab/vocab/skos/397 elements and compounds BT