Dissolved Oxygen

{
  "id": "MLC-T-ENV-008237",
  "term": "Dissolved Oxygen",
  "field": "Environment",
  "definition": "1. Oxygen that is freely available in water to sustain the lives of fish and other aquatic organisms.\n\n2. The amount of oxygen that is dissolved in water. This term also refers to a measure of the amount of oxygen available for biochemical activity in a waterbody, and is an indicator of the quality of that water.\n\n3. The oxygen dissolved in water or sewage. Adequately dissolved oxygen is necessary for the life of fish and other aquatic organisms and for the prevention of offensive odors.\n\n4. Measure of water quality indicating free oxygen dissolved in water.\n\n5. The amount of oxygen that is present in the water. It is measured in units of milligrams per liter (mg/L), or the milligrams of oxygen dissolved in a liter of water. Just like humans, all of the Bay's living creatures need oxygen to survive.\n\n6. The oxygen freely available in water, vital to fish and other aquatic life and for the prevention of odors. DO levels are considered a most important indicator of a water body's ability to support desirable aquatic life. Secondary and advanced waste treatment are generally designed to ensure adequate DO in waste-receiving waters.\n\n7. The amount of oxygen measured in the water.\n\n8. Molecular oxygen (oxygen gas) dissolved in water. The concentration in water is a function of atmospheric pressure, temperature, and dissolved-solids concentration of the water. The ability of water to retain oxygen decreases with increasing temperature or dissolved-solids concentration. Photosynthesis and respiration by plants commonly cause diurnal variations in dissolved-oxygen concentration in water from some streams.\n\n9. Concentration of oxygen dissolved in water, expressed in mg/l or as percent saturation, where saturation is the maximum amount of oxygen that can theoretically be dissolved in water at a given temperature and pressure.",
  "abbreviation": "DO",
  "subject": "Water",
  "references": [
    "Environmental Issues Terms & Acronyms",
    "Sediment Total Maximum Daily Loads (TMDLs) Glossary",
    "Aquatic Biodiversity Glossary",
    "Drinking Water Technical & Legal Terms",
    "Chesapeake Bay Glossary",
    "Terms of Environment",
    "Lake Erie Lakewide Management Plan (LaMP) Glossary",
    "USGS Water Resources Data State, 2005 Definition of Terms",
    "NOAA Coral Reef Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/dissolved-oxygen/"
}