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Defining Dissolved Oxygen

1/5/2015

2 Comments

 
Dissolved oxygen (DO) is the amount of oxygen in water. The main sources of DO in water are the atmosphere and aquatic vegetation. The oxygen is then lost through oxidation of sediment, by respiration of aquatic organisms, and oxidation of organic matter. The input and consumption of DO in an aquatic system are influenced by temperature, water depth and water movement. 
Picture
Figure 1: Dissolved Oxygen cycle in freshwater [Source: http://www.nanoos.org/education/learning_tools/hypoxia/oxygen_underwater.php]
If the amount of oxygen consumed exceeds the input amount, the oxygen becomes depleted in the system. If DO levels become too low then stress is put on aquatic systems, and most aquatic species cannot survive without oxygen. The water quality guidelines for the protection of aquatic life are found in Table 1, and are dependent on water temperature and life stage. Adult fish have the ability to survive at lower values of DO depending on the species and water temperature, but the limited oxygen will negate their abilities to reproduce along with the survival of juvenile fish. If an aquatic system begins to have lower DO levels than in the past, this could change the biodiversity of the ecosystem as this will attract species which have tolerances to lower DO, or anaerobic organisms (which don’t need oxygen for survival) while ones with less tolerance will leave. 
Picture
Waste water from washing fruits and vegetables tends to have low DO levels. It is important to try and increase the DO in this water through different systems such as settling ponds with aerators and other technologies to reduce the environmental impacts. The Lake Simcoe Protection Plan indicated a goal of 7 mg/L DO in deep water in 2008; in 2012 the DO levels had improved over the values from 2008 but were not yet at the goal.

References
  • Canadian Council of Ministers of the Environment. 1999. Canadian water quality guidelines for the protection of aquatic life: Dissolved oxygen (freshwater). In: Canadian environmental quality guidelines, 1999, Canadian Council of Ministers of the Environment, Winnipeg.
  • Government of Ontario. 2013. Minister’s Annual Report on Lake Simcoe 2011-2012. Queen’s Printer of Ontario. Toronto, Ontario
  • Oram, B. 2014. Dissolved Oxygen in Water. Water Research Watershed Center. http://www.water-research.net/index.php/dissovled-oxygen-in-water
2 Comments
form an llc in vermont link
6/29/2021 12:29:17 am

I am very excited about the title of this article. It is really helpful for me in making dissolved oxygen related products. This will help my small business expand. Our products will help customers who need them. Thank you for sharing the useful information.

Reply
Ivan Dunn link
5/18/2022 12:58:15 pm

Hi niice reading your blog

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