22 Determinants of Water Quality 8

22 Determinants of Water Quality 8 - Oxygen enters the...

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Oxygen is also water Soluble In natural systems, oxygen diffusing from the atmosphere and from plant photosynthesis dissolves in water Diffusion of O 2 from the atmosphere is generally slow Oxygen Slow diffusion
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Temperature and Oxygen The solubility of oxygen in water is highly temperature dependent. Saturated Oxygen Content 10.1 mg/L 8.3 mg/L 15 o C 25 o C Affects species diversity
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Cold water species: 5-6 mg/L Trout Cool water species: 4 mg/L Pike Warm water species: 2-3 mg/L Bass, Catfish, Bluegill Fish Species Minimum Oxygen Tolerances
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Warm Water High biotic activity High demand on oxygen Decreased oxygen content Slow diffusion of oxygen Oxygen contents can affect the form, solubility, or toxicity of important contaminants Heat also increases Biological activity
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Oxygen Oxygen is water soluble, but its solubility is temperature-dependent. In the atmosphere, about one out of 5 molecules is oxygen; in water, about one out of every 100,000 molecules is oxygen.
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Unformatted text preview: Oxygen enters the water body from the atmosphere (slowly) and from photosynthesis near the surface Oxygen leaves the water column principally by organism respiration. Higher temperatures increase biotic activity, decreasing oxygen Higher temperatures decrease the ability of water to hold or contain O 2 . Oxygen status affects microbial populations and other species diversity as well as the availability or toxicity of important water contaminants. pH pH (hydrogen) H + ion Ions are stable forms of elements that result from gaining or losing electrons in chemical reactions Cations have lost electrons and are positively charged Anions have gained electrons and are negatively charged H + , Na + , K + , Ca 2+ , NH 4 + , Mg +2 Cl , F , NO , CO , SO Elements have equal numbers of protons (+) and electrons (-)...
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