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The atmosphere
- The dissolved oxygen content may be reported in terms of the actual concentration or as a percentage of saturation. The ultimate source of oxygen in water exposed to air is the atmosphere, but some oxygen is contributed by as a byproduct of photosynthesis.
basicwaterscience.com/chemical-water-quality-parameters/dissolved-gases/dissolved-oxygen-in-water/
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Jun 5, 2018 · A small amount of oxygen, up to about ten molecules of oxygen per million of water, is actually dissolved in water. Oxygen enters a stream mainly from the atmosphere and, in areas where groundwater discharge into streams is a large portion of streamflow, from groundwater discharge.
One is through the air; oxygen naturally diffuses into the water from the atmosphere, particularly at the water’s surface. Another way oxygen enters is via photosynthesizing plants and algae, which give off oxygen as a waste product.
- Iodometric Method
- Amperometric Membrane Electrode Methods
- Optical Sensor Electrode Technology
The description of this method was taken from Standard Methods for Examination of Water and Wastewater (APHA et al, 1995). This reference should be consulted for more detailed information when needed. The iodometric method can be one of the most precise and reliable procedures for DO analysis. This is atitration-based method based on the reaction o...
The amperometric electrode method uses a submersible, membrane-covered electrode that is attached to a meter that gives direct readings in mg/L (parts- per million, PPM) or percent saturation. There are a variety of membrane electrodes that are commercially available and that provide an excellent method for DO measurement in highly polluted and/or ...
Optical sensor technology has recently become more commercially available and accepted. These systems are based on optical fluorescence/luminescence principles. In short, light of a specific wavelength interacts with optically active molecules, which absorb the light energy and become molecularly excited. When the excited molecules return to their ...
Mar 28, 2017 · Oxygen concentrations are much higher in air, which is about 21% oxygen, than in water, which is a tiny fraction of 1 percent oxygen. Where the air and water meet, this tremendous difference in concentration causes oxygen molecules in the air to dissolve into the water.
Oxygen gets into water three ways: 1) diffusion from the surrounding air; 2) aeration (rapid movement); and 3) when released as a by-product of photosynthesis by algae and aquatic plants. There are a number of physical and biological factors that can impact the DO levels in waterbody such as a lake.
The primary sources of oxygen in surface waters are transfer of oxygen from the air and by plants and algae in the water due to photosynthesis.
