For a natural water sample, what range of dissolved oxygen concentration may you

Question

For a natural water sample, what range of dissolved oxygen concentration may you expect? explain your reasoning.

How does the dissoled oxygen concentration in a water sample change (if at all) with

a) ambient temperature changes?

b) atmospheric pressure changes?

c) the volume of the flask collecting the water sample?

d) the amount of organic matter in the water sample?

For a natural water sample, what range of dissolved oxygen concentrations may you expect? Explain your reasoning. How does the dissolved oxygen concentration in a water sample change (if at all) with a. ambient temperature changes. atmospheric pressure changes? the volume of the flask collecting the water sample? the amount of organic matter in the water sample? the depth of the body of water (e.g.. lake, river, or ocean)?

Explanation / Answer

1. Anywhere from 14.6 to 5.95 mg/l based on the temperature.

2.

A) higher temp=less oxygen dissolved

B) higher pressure=less dissolved

C) not sure, is the volume of the water changing too? My best guess is that bigger flask=more dissolved because there's more air above the water

D) more organic matter=less oxygen. Not sure how it changes how O2 is dissolved but it can consume O2.

E) the deeper you go the less oxygen can be dissolved

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