A Monitor's Guide to Water Quality

Dissolved Oxygen (DO)

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Healthy water should generally have dissolved oxygen concentrations above 6.5-8 mg/L and dissolved oxygen saturation between about 80-120%.

Dissolved oxygen is influenced by : water temperature, algae growth (e.g., chlorophyll )

Dissolved oxygen influences : the forms and toxicity of certain metals (e.g., dissolved metals) and concentrations of certain chemical constituents (e.g., sulphide and ammonia)