Water Chemistry

Dissolved Oxygen [DO] 

Definition: DO is a measure of the of the amount of dissolved oxygen in the water. A small amount of oxygen, up to about ten molecules of oxygen per million of water, is actually dissolved in water. Dissolved oxygen is breathed by fish and zooplankton. The process whereby bacteria breaks down organic matter via sewage-treatment plant consumes oxygen and excess organic material in our lakes and rivers can cause an oxygen-deficient situation to occur. 


Ideal range: The level of dissolved oxygen (DO) contributes directly impacts the quality of the water; the absence of oxygen creates and anaerobic conditions which are associated with stagnant water. 


Method of measurement: There are three standard methods of measurement including the colorimetric, titrimetric and polarosetic methods. You application will dictate the most appropriate method for measurement. 


Method of control: The most common methods for increasing the DO include aeration and oxidation.  

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