Question

What is the concentration of dissolved oxygen in freshwater?

Answer 1

Explanation:

In the Pompton River in New Jersey, mean dissolved oxygen concentrations range from 12-13 mg/L in winter and drop to 6-9 mg/L in the summer ⁸. That same river shows daily fluctuations of up to 3 mg/L  due to photosynthesis production . The quantities usually vary with different seasons, depths, locations, and different freshwater ecosystems.

Answer 2

Freshwater at sea level has a saturation dissolved oxygen concentration of about 14.6 mg/l at 0C (32F) and 8.2 mg/l at 25C (77F). Generally, oxygen concentrations are below saturation due to the presence and oxidation of decaying organic matter (suspended, benthic, or sediment).

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