What is DO

What is DO?

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DO or dissolved oxygen means oxygen that’s dissolved inside a pool of water like rivers which is there because of diffusion in the air. It can also be dissolved in the water by plant photosynthesis.

The way to measure DO is by using a DO scale. The DO scale goes from 0-18 ppm but most water systems only need 5-6 ppm. If the DO level is to high the water can become toxic. If the water gets to warm usually the DO level will go down. The opposite happens if the water gets to cold.

What is DO for

DO is important because if we didn’t have DO there wouldn’t be any aquatic plants and animals other than the ones that surface to breath, like whales.

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This graph is from the Chesapeake Bay DO Criteria website. Click the picture to go to it.

A chemical we had to use to test the DO.

A bottle of our test water during procedures.

Chimacum Middle School 6th Grade