Dissolved Oxygen2008 - Determination of Dissolved Oxygen in...

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Determination of  Determination of  Dissolved Oxygen in Water Dissolved Oxygen in Water
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Natural Waters Healthy bodies of water support varied plant and animal life. In order to sustain fish, natural waters must have a dissolved oxygen concentration of 5-7 mg per liter.
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Natural Waters Plants in water provide oxygen through photosynthesis: n CO 2 + n H 2 O → C n H 2n O n + n O 2
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Natural Waters Decaying organic matter in natural waters consumes oxygen by the reverse of this reaction: n O 2 + C n H 2n O n → n CO 2 + n H 2 O This is called aerobic decay of organic matter.
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Insufficient oxygen kills fish If the dissolved oxygen level in a body of water falls below 2 or 3 mg/L (ppm), fish asphyxiate. Their decomposition consumes more oxygen.
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Eutrophication The result of this vicious cycle is eutrophication.
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Fertilizers can cause dead zones Can be a big problem in ‘Fish Farms”
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7,000 sq miles of dead zone Gulf of Mexico
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Solubility of Oxygen At 25° C. and 0.21 atm O 2 pressure, the equilibrium solubility of oxygen in water is 8.7
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