chemical characterization data tag dissolved oxygen measurement characterization tag 2023-05-18T19:08:34.869Z https://www.epa.gov/national-aquatic-resource-surveys/indicators-dissolved-oxygen used as a partial source for the "Example Guidance". https://orcid.org/0000-0002-9578-0788 requires discussion A chemical characterization data tag which indicates the presence of data that describes a measurement of dissolved oxygen. Example Guidance: Use this tag to indicate additional data is available that provides characterization information from the amount of oxygen that is present in water. https://orcid.org/0000-0002-1107-9135 dissolved oxygen measurement dissolved oxygen measurement characterization data tag https://orcid.org/0000-0002-8844-9165