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NOAA
Noaa: Estuary Education: Water Quality Specifics: Using a Colorimeter
Watch students use classroom tools to measure estuarine water quality. Students sample estuary water for salinity and dissolved oxygen using a low-end colorimeter. [2:21]
Bozeman Science
Bozeman Science: Ap Biology Lab 12 Dissolved Oxygen
Mr. Andersen demonstrates the azide-winkler method of dissolved oxygen analysis.