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AP BIO Lab 12 Dissolved Oxygen

AP BIO Lab 12 Dissolved Oxygen. OXYGEN AVAILABILITY. Depends on: ~Temperature: Ability to hold oxygen decreases as water temp gets warmer ~ Photosynthetic Activity: In bright light, plants produce more oxygen

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AP BIO Lab 12 Dissolved Oxygen

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  1. AP BIO Lab 12Dissolved Oxygen

  2. OXYGEN AVAILABILITY Depends on:~Temperature: Ability to hold oxygen decreases as water temp gets warmer ~ Photosynthetic Activity: In bright light, plants produce more oxygen ~ Decomposition Activity: As organic material decays, microbial processes consume oxygen ~ Mixing/turbulence: Wave action, water falls, and rapids all aerate water and increase oxygen concentration ~ Salinity: As water becomes more salty, it holds less oxygen

  3. Temperature Warm water dissolves ~ MORE SOLIDS than cold ~ LESS GAS than cold • Reason why pop loses it’s fizz as it gets warm http://randolphmase.files.wordpress.com/2009/03/glass-of-soda1.jpg

  4. → PHOTOSYNTHESIS 6 CO2 + 6 H2O +Light energy C6H12O6 + 6 O2 RESPIRATION C6H12O6 + 6 O2 6CO2 + 6 H2O + energy →

  5. Waves, waterfalls, rapids all increase oxygen concentration http://www.filetransit.com/images/screen/9fdd62319548bc0715910a209786d26f_Sparkling_Waves_ScreenSaver.jpg http://www.chinaodysseytours.com/huangshan/photos/waterfall_7.jpg http://www.waterfall-wallpapers.com/Waterfall/Waterfall-97/

  6. What is the % saturation of a sample with 8 mg/L oxygen at 15° ? What is the % saturation of a sample with 8 mg/L oxygen at 5° ? Maximum amount of oxygen can water hold = SATURATION http://www.moderngent.com/media/sponge_466x389.jpg

  7. FIXATION OF VIALS

  8. TITRATION Don’t fill or empty syringe past the number markings http://randolphmase.files.wordpress.com/2009/03/glass-of-soda1.jpg

  9. Continue adding titratingsolution until blue color changes to from purpleto pale yellow/colorless. If color change does not occur when the ring on the plunger reaches the bottom of the scale, refill the titrator to the zero line and continue titrating. Keep track of volume used.

  10. http://biology.clc.uc.edu/courses/bio303/ecotones.htm Amount of light drops off sharply with increasing depth Modeled by wrapping sample bottles inincreasing layers of screen

  11. PRIMARY PRODUCTIVITY =rate at which photosynthesizers produce organic compounds in ecosystem Can be measured by: ~ amount of CO2 used ~ rate of sugar formation ~ rate of oxygen produced

  12. GROSS PRODUCTIVITY = Total production of all organic compounds made by photosynthesis NET PRODUCTIVITY = Organic material that remains after cellular respiration uses some of thesecompounds for their energy needs

  13. Net productivity = Gross productivity - respiraton Determined by measuringoxygen consumption in dark w/o Photosynthesis Determined by measuring oxygen productionin light If measure these 2 . . . We can calculate GROSS PRODUCTIVITY

  14. NITRATES http://justgetthere.us/blog/archives/Threat-of-Nitrate-To-Our-Environment-and-Health..html

  15. NITRATES

  16. http://backtoessentialsllc.com/our-services/alkaline-therapy/http://backtoessentialsllc.com/our-services/alkaline-therapy/

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