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Dissolved Oxygen

Dissolved Oxygen. WQT 134 Environmental Chemistry II Dissolved Oxygen. Key Words. Dissolved Oxygen- The amount of oxygen in a sample. Impacted by flow rate, photosynthesis, aerobic respiration, elevation, clarity, temperature, sludge deposits, and water depth. Dissolved Oxygen.

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Dissolved Oxygen

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  1. Dissolved Oxygen WQT 134 Environmental Chemistry II Dissolved Oxygen

  2. Key Words • Dissolved Oxygen- The amount of oxygen in a sample. Impacted by flow rate, photosynthesis, aerobic respiration, elevation, clarity, temperature, sludge deposits, and water depth

  3. Dissolved Oxygen Temp: Colder the water the more DO it can hold. As temp goes down DO goes up.

  4. Dissolved Oxygen Temp: Warm turbid water will have low DO values. Wetlands

  5. Dissolved Oxygen Elevation: At higher elevations, less oxygen can be dissolved in water. 

  6. Dissolved Oxygen Photosynthesis: dissolved oxygen concentrations may be very low in the morning, and very high in the afternoon

  7. Dissolved Oxygen Flow rate: Increased flow rate increased mixing of DO into the water.

  8. Dissolved Oxygen Sewage: Increased sewage can lower DO in the water.

  9. Dissolved Oxygen Aquatic Health: ~< 5 mg/L DO poor for aquatic fish ~10 mg/L ideal DO concentrations

  10. Langelier Saturation Index (LSI) Factoids • Aggressive (corrosive) or scaling condition of water • Online calculator • Precipitate or Dissolve CaCO3 • Difference between pH of water and pH of CaCO3 LSI= pH (actual) – pH (s) • pH (actual) =measured pH of water • pH (s)= theoretical pH at which the water will be saturated with calcium carbonate. Takes into account Ca ion [], alkalinity, pH, Temp, and TDS LSI=0 water is stable (rare) LSI= + CaCO3 will precipitate (scaling) +1 mild scale, +4 severe scale LSI = - CaCO3 will dissolve (corrosion) -1 mild, -5 severe

  11. Langelier Saturation Index (LSI)

  12. Langelier Saturation Index (LSI) Exercise Determine the Langelier index for a water sample with the following characteristics, using the Powell, Bacon and Lill diagram: Temperature = 120oF, M-Alk = 100 mg/L, Ca-hardness = 120 mg/L, pH = 8, total dissolved solids = 210 mg/L. • LSI= pH (actual) – pH (s) pH actual = 8.0 – 7.32= +.68 pH (s) = pCa= 2.92 pAlk=2.7 “C” at 120o= 1.7 pH(s) Sum= 7.32

  13. Langelier Saturation Index (LSI) 1.7 C at 120o 2.92 PCa 2.70 P(Alk) Hardness=120 mg/L P Alk=100 mg/L TDS=210 mg/L

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