Dissolved oxygen. A relevant experiment for the introductory laboratory

Abstract

Students measure the dissolved oxygen content of water from several natural sources as well as the change in solubility with temperature.

Determination of Biochemical Oxygen Demand of Area Waters: A Bioassay Procedure for Environmental Monitoring

“…These meters rely on the diffusion of oxygen across a membrane and accurate readings require that the sample continuously moves past the membrane during the measurement to prevent depletion of oxygen near the probe. If a DO meter is not available, dissolved oxygen levels may be determined with the classic Winkler titration by a method described in this Journal …”

“…The importance of water quality in the environment has been highlighted in this Journal and elsewhere through special issues, , annotated bibliographies, , and laboratory exercises designed around the monitoring and removal of chemicals found in water supplies. − Although contaminants investigated in these laboratory exercises are important to monitor, some pollutants are of local or regional concern and are not always applicable to other watersheds. Oxidizable carbon, however, is a component of all surface water and becomes a serious pollutant at elevated levels because its presence stimulates the growth of bacteria with concurrent consumption of dissolved oxygen (DO).…”

Environmental chemistry in the high school curriculum

“…Dissolved oxygen measurements are very important in environmental chemistry and are easy to perform in an introductory chemistry laboratory (6)(7)(8). Water samples may be collected from a local river or stream, or even a large aquarium in the biology laboratory.…”

Inhibition of Sulfite Oxidation by Phenols: Screening Antioxidant Behavior with a Clark Oxygen Sensor

“…The dissolved oxygen of natural waters is very important for living creatures in lakes, streams, and oceans, so its measurement in laboratory courses is relevant to environmental studies (1,2). Oxygen content is also important from another point of view.…”