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Dissolved oxygen

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Dissolved oxygen, resolved
Endress+Hauser Ltd
Using the fluorescence quenching principle, the Oxymax COS61 provides accurate and reliable DO measurement across a host of water applications.


Dissolved oxygen (DO): Amount of oxygen gas dissolved in a given quantity of water at a given temperature and atmospheric pressure. It is usually expressed as a concentration in parts per million or as a percentage of saturation.

Dissolved Oxygen (DO): oxygen dissolved in water and readily available to fish and other aquatic organisms.
Diversion Rate: measure of the amount of waste material being diverted for recycling compared with the total amount previously thrown away.

Dissolved Oxygen (DO)
Oxygen that is freely available in water to sustain the lives of fish and other aquatic organisms.
Dose
In terms of monitoring exposure levels, the amount of a toxic substance taken into the body over a given period of time.

Dissolved Oxygen (DO): 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.

~ (DO): oxygen gas dissolved in water.
dissolved solids: materials that enter a water body in a solid phase and dissolve in water.

~ (DO) - The amount of oxygen freely available in water and necessary for aquatic life and the oxidation of organic materials.

~ (DO) content
Amount of oxygen dissolved in a given volume of water at a given temperature and atmospheric pressure; usually expressed in parts per million (ppm).
diversity (species diversity, biological diversity) ...

~ (do) The amount of ~, in mg/L, present in water.
dissolved solids A dispersion by very small, nonsettling molecules not removed by filtration practices as defined by the method of measurement.

~ (DO). Measure of water quality indicating
free oxygen dissolved in water.
distillate (DIS-tuh-late). In the distillation of a sample, a ...

~
The amount of oxygen dissolved in water at a certain time, expressed in ppm mg/L.
Dissolved solids ...

D ~
Definition (english only)
Amount of gaseous oxygen (O2) actually present in water expressed in terms either of its presence in the volume of water (milligrams of O2 per litre) or of its share in saturated water (percentage).

~: Oxygen dissolved in water. The amount depends on temperature of the water, plant photosynthesis, plant and animal respiration, and physical aeration caused by tumbling. Measured in parts per million (mg/L).
Doctrine of Prior Appropriation: ÒFirst in Time, First in Right. ...

~ (DO) and pH (to characterize the oxygen swings);
Turbidity and chlorophyll (to monitor changes in algae growth); and
Nitrate and phosphate levels (to monitor the nutrients).

~ (DO) The amount of molecular oxygen dissolved in water.

Dump An illegal and uncontrolled area where wastes have been placed on or in the ground. See Landfill.

~ Uptake Ratio, reported as mg DO/L/hour, a test that is used to measure how much oxygen is being consumed by the microbes in a wastewater treatment plant, to assure that the biomass is receiving sufficient dissolved oxygen.
Ecology: ...

~ (DO)
Refers to oxygen that is dissolved in water and therefore available to plants, fish, insects and other organisms.
downed woody debris ...

Amount of dissolved oxygen needed by aerobic decomposers to break down the organic materials in a given volume of water at a certain temperature over a specified time period. See BOD5.
Provided as a public service by the U.S. Environmental Protection Agency. Reference list click here.

Waters with dissolved oxygen concentrations of less than 2 ppm, the level generally accepted as the minimum required for most marine life to survive and reproduce.
Source: Terms of the Environment
...

Water Dissolved Oxygen levels of about 9 parts per million (ppm) are needed to support most fish and 4.5 ppm is the minimum for life support. Trout use 50-60 milligrams of oxygen per hour at 41 degrees Fahrenheit (F) but need five or six times that amount at 77 F.

~ (DO) the oxygen dissolved in sewage, water, or other liquid, usually expressed in milligrams per liter or percent of saturation. It is the test used in BOD determination.

BOD5- The amount of dissolved oxygen consumed in five days by biological processes breaking down organic matter.
Body Burden- The amount of a chemical stored in the body at a given time, especially a potential toxin in the body as the result of exposure.

Algal blooms reduce the amount of dissolved oxygen in lakes and rivers and can result in fish kills. ambient air Any unconfined portion of the atmosphere; the outside air. anadromous Migratory fish that ascend rivers from the sea to spawn, like salmon.

It is very likely that the dissolved oxygen content of the ocean will decrease by 3 to 6% during the 21st century in response to surface warming (see Box 6.5, and Section 6.4.5).

Hydrogen peroxide is used to increase the dissolved oxygen content of groundwater to stimulate aerobic biodegradation of organic contaminants. Hydrogen peroxide is infinitely soluble in water, but rapidly dissociates to form a molecule of water (H2O) and one-half molecule of oxygen (O).

hypoxia - the depletion of dissolved oxygen in water, a condition resulting from an overabundance of nutrients of human or natural origin that stimulates the growth of algae, which in turn die and require large amounts of oxygen as the algae decompose.

Anoxic waters are regions of sea water or fresh water that are depleted of dissolved oxygen. This condition is mostly found in regions that have confined water exchange. Anoxic waters are a natural phenomenon.

In this condition, the soil is free of dissolved oxygen. Gley (bluey-grey) colours are often an indication of prolonged saturation. The definition is used as a Suborder distinction for Podosols and Vertosols in the Australian Soil Classification (Isbell, 2002).

Through this Web site you can download an excellent document that explains in great detail the causes and effects of hypoxia in the northern Gulf of Mexico (PDF, 14 pages, 1.7 Mb), and access an interactive map that shows levels of dissolved oxygen at a range of depths during the summers of 2002, ...

The amount of oxygen required by aerobic biological processes to break down the organic matter in water. BOD is a measure of the pollutional strength of biodegradeable waste on dissolved oxygen in water.
Biomass ...

is a process whereby water bodies, such as lakes, estuaries, or slow-moving streams receive excess nutrients that stimulate excessive plant growth (algae, periphyton attached algae, and nuisance plants weeds). This enhanced plant growth, often called an algal bloom, reduces dissolved oxygen in the ...

Reaeration: mechanical augmentation of ~ in water, as in cresting waves or below waterfalls.
Realized Niche: the part of a niche actually occupied by a species. Contrast with Fundamental Niche.

Technologies like fish ladders help salmon go up over dams and enter upstream spawning areas, but the presence of hydroelectric dams changes their migration patterns and hurts fish populations. Hydropower plants can also cause low ~ levels in the water, ...

See also: See also: What is the meaning of Oxygen, Water, Air, Environment, Organic?

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