For the municipality of the same name in Gloucester County, see Monroe Township, Gloucester County, New Jersey.
How to measure dissolved oxygen. Dissolved oxygen is measured using a dissolved oxygen meter. The best method is to take the measurement in the field at the same time each day because DO concentrations can vary throughout a 24 hour period.issolved oxygen (DO) is a measure of the quantity of free oxygen molecules in water.
One unit of measure of dissolved oxygen in water is parts per million (ppm), which is the number of oxygen (O2) molecules per million total molecules in a sample.ow dissolved oxygen levels can also indicate an excessive demand on the oxygen in the system. Some pollutants such as acid mine drainage produce direct chemical demands on oxygen in the water for certain oxidation-reduction reactions.