22 Determinants of Water Quality 7

22 Determinants of Water Quality 7 - NaCl Na + + Cl-Na +...

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SO 4 -2 HS - O 2 NO 3 - SO 4 -2 Respiration and Still Ponds C 6 H 12 O 6 + 3 SO 4 2- + 3H + = 6HCO 3 - + 3 HS - Heterotrophic Organisms oxygen Aerobic heterotrophs consume oxygen Anaerobic heterotrophs Use nitrate instead of O 2 Anaerobic heterotrophs Use sulfate instead of O 2
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C 6 H 12 O 6 + 3 NO 3 - + 3H 2 O = 6HCO 3 - + 3NH 4 + 1796 kJ C 6 H 12 O 6 + 3 SO 4 2- + 3H + = 6HCO 3 - + 3HS - 453 kJ C 6 H 12 O 6 + 6O 2 → 6CO 2 + 6H 2 O 2880 kJ Anaerobic respiration also is less efficient and produces less energy than aerobic respiration
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Carboniferous Period About 350 million years ago First land plants: 480 mya. Primitive bark-bearing trees (lignin) Anaerobic respiration is less efficient, slower, and produces less energy than aerobic respiration anaerobic
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Solubility The ease with which substances dissolve in water
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Unformatted text preview: NaCl Na + + Cl-Na + Sodium Chloride is extremely soluble in water The solubility of other ionic salts varies KCl soluble CaCO 3 somewhat soluble HgCl 2 soluble PbCO 3 poorly soluble FePO 4 poorly soluble The degree to which contaminants can exist in water is often determined by their solubility Solubility also can be influenced strongly by factors such as pH and oxygen content Many toxic organic pollutants including pesticides, and industrial products are extremely insoluble in water. DDT Dioxins PCBs Ironically their insolubility in water is partly responsible For their persistence in the environment....
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22 Determinants of Water Quality 7 - NaCl Na + + Cl-Na +...

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