Dissolved oxygen

Dissolved oxygen is molecular oxygen present in water. Its concentration affects aquatic respiration, ecosystem health, and oxidation reactions.

Henry's law: A gas's equilibrium concentration in a liquid is proportional to its partial pressure above the liquid at constant temperature. It describes how oxygen partial pressure sets the equilibrium concentration in water.
Hypoxia (environmental science): An environmental condition in which oxygen availability is too low to meet the needs of organisms. Low dissolved oxygen can create hypoxic waters and threaten aquatic animals.
Oxygen: A chemical element with atomic number 8; its diatomic gas, O₂, is essential to aerobic respiration and combustion. Dissolved oxygen is the aqueous form of molecular oxygen.
Eutrophication: Nutrient enrichment of an aquatic ecosystem that increases biological production and can disrupt ecosystem conditions. Nutrient-driven blooms and decay can consume oxygen and cause depletion.
Gulf of Mexico hypoxic zone: A recurring region of low oxygen on the northern Gulf of Mexico seafloor, associated with nutrient-rich river discharge. It demonstrates how watershed nutrient inputs can produce seasonal hypoxia.
Oxygen solubility in water: The capacity of water to hold dissolved molecular oxygen at equilibrium under specified conditions. It explains why warmer or saltier water generally holds less oxygen.
Dead zone (ecology): An aquatic area where oxygen depletion makes conditions unsuitable for many organisms. Persistent oxygen loss can produce these severely depleted regions.
Concentration: A measure of the amount of a substance in a specified amount of mixture or space. Dissolved oxygen is commonly reported as mass per volume of water.
Algal bloom: A rapid increase in the abundance of algae in an aquatic system. Bloom growth and subsequent decomposition can drive sharp oxygen fluctuations.
Lake Nyos disaster: A 1986 limnic eruption in Cameroon that released carbon dioxide from Lake Nyos and killed nearby people and animals. The event highlights how dissolved gases and lake stratification can create acute hazards.

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