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Dissolved oxygen refers to the amount of free, non-compound oxygen present in water and is one of the most important indicators of water quality in natural and engineered aquatic systems. It originates primarily from two sources: diffusion of atmospheric oxygen into water and photosynthetic activity of aquatic plants, algae, and phytoplankton. The concentration of dissolved oxygen is usually expressed in milligrams per liter (mg/L) and varies with physical, chemical, and biological conditions of the water body. Temperature plays a critical role in determining dissolved oxygen levels, as the solubility of oxygen decreases with increasing temperature. ___ _______ ___ _______ __________ _______ _______ ____ __________.
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