Factors that affect the amount of oxygen dissolved

factors that affect the amount of oxygen dissolve in water:

1. 
   
   Temperature: Warm water has less ability to hold oxygen than cold water.
2. 
   
   Photosynthesis: In bright light plants produce more oxygen.
3. 
   
   Recomposition Activity: As organic material decompose it takes oxygen out of the water.
4. 
   
   Mixing and Turbulence: Places of high turbulence like waterfalls, rapids and wave action increase the amount of oxygen concentration.
5. 
   
   Salinity: Salty water ability to hold oxygen is less than clear water.

 Procedures

1. 
   
   fill seven bottles with algae-rich culture.
2. 
   
   seal the bottles with caps to prevent air.
3. 
   
   write the % of light that the sample will received.
4. 
   
   wrap bottles in foil or screen.
5. 
   
   test the DO of the initial bottle.
6. 
   
   place the remaining bottles on their side in a tray under a fluorescent light for 24 hours. 

• 
  
  Purpose - monitor the effect of varying light levels on dissolve oxygen in an algae-rich culture. Also to see how the dark affect the state of photosynthesis.
• 
  
  Result  - photosynthesis is efficient or able to happen in light places, but in the dark photosynthesis is not able to happen.