Friday, 4 July 2014

Literature Review [Xueqin]

How do we determine the water quality using water plants?

Water quality can be measured by 7 methods. 
  • Temperature 
  • Amount of dissolved oxygen in it 
  • pH level 
  • Turbidity level

Water temperature because it determines the kinds of animals that can survive in a stream as certain animals are adapted to only survive under certain conditions. It can also the affect the chemistry of the water. Scientists also measure dissolved oxygen to know how much oxygen is available in the water for fish and other aquatic organisms to breathe. Healthy waters have high levels of dissolved oxygen. These include temperature, the amount and speed of flowing water, the plants and algae that produce oxygen during the day and take it back in at night, pollution in the water, and the composition of the stream bottom. pH levels determine the concentration of hydrogen in the water. Changes in pH can affect how chemicals dissolve in the water and whether organisms are affected by them. Highly acidic water can be lethal to fish and other aquatic organisms. Scientists measure the clarity of water to determine how many particles are floating around. Scientists use turbidity measurements to calculate the inputs from erosion and nutrients. By taking samples of fish, plants and smaller organisms. Other organisms can survive only in water that's very clean, so finding those organisms who are able to survive in the water it shows that the water is very clean. (U.S. Environmental protection agency, 2012)
Sourced from: http://water.epa.gov/learn/resources/measure.cfm

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