Dissolved oxygen (DO) refers to the level of free, non-compound oxygen present in water or other liquids. It is an important parameter in assessing water quality because it supports aquatic life. DO is typically measured in milligrams per liter (mg/L) or parts per million (ppm). Common uses include monitoring water quality in lakes, rivers, and streams; aquaculture to ensure sufficient oxygen levels for fish and shellfish; and wastewater treatment to optimize biological processes.
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