All about D.O.

*Dissolved Oxygen ranges from 0-18 *ppm. Most natural waters range from 5-6 *parts per million. Oxygen can enter the water by *photosynthesis or by the *atmosphere.

When there is pollution in the water. When *D.O. levels drop
it can cause changes in the number of water animals and macorinvertebrates. Some Species can’t tolerate these drops. These animals are stone fly nymphs, caddis fly larvae, and beetle larvae. So pollutant tolerant worms
come in.

*Dissolved oxygen levels vary from the time, temperature, and weather. So, unless you want to do a comparison it would have to be the same time, temp., and weather.

*D.O. measurements can change a lot in lakes depending on distance and depth from shore. When measuring *D.O. samples from a stream it is best to take the samples from an area with similar flow movement, unless you want to measure the difference.
Don’t sample slow moving water because it will create a wrong measurement of *dissolved oxygen.
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*Definition in glossary

Karynna adding drops to find the Dissolved Oxygen measurment. This is Karynna measuring 100 ml.

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