Dissolved Oxygen (DO)
What is dissolved oxygen?
Dissolved oxygen is the amount of oxygen mixed into the water and is necessary for aquatic life. 2.
How does it get into the water?
DO gets into the water in many different way but primarily it is absorbed from the atmosphere and aquatic plants. 3.
Why is it important?
DO is important because it provides oxygen to aquatic organisms and without it they wouldn’t be able to live. Low levels would cause hypoxia and make it extremely difficult for aquatic organisms to live. 4.
What other chemical parameter directly influences the amount of oxygen the water can hold? Other chemical parameters that are influenced by DO organic waste and microscopic organisms that use oxygen to breakdown waste. 5.
What is the level of DO in the water that is considered a good level? The level of DO that is considered a good level is 5 mg/L.
What is E. coli?
E. coli is a bacterium that is regularly found in the stomach of warm-blooded organisms. 2.
How does it get into the water?
E. coli can get in the water from human and animal waste and if not treated it can end up in bigger bodies of water. 3.
What are some sources?
E. coli can come from getting rid of waste through dumping, broken septic tanks, household pet waste, livestock, and storm water runoff. 4.
Why do we test for it?
We test for E. coli because it can make people extremely sick if digested. It can cause diarrhea and urinary tract infections among other things. 5.
What other chemical parameters are high E. coli levels often associated with? Other chemical parameters could be how much sediment is in the water. 6.
What level of E.coli is same for drinking?
E. coli must be at a level of 1 CFU/100mL in order to be consumed by humans.
What is pH?
pH is the measure of hydrogen ion concentration in a substance and is used to test how basic or acidic water is. 2.
What is pH influenced by?
pH is influenced by the measure of hydrogen ion concentration the water. 3.
What can happen in the environment to change the pH of water? If the pH of the water in a specific area changes some organisms wouldn’t be able to adapt and some species may be lost due to the change. 4.
What can pH affect?
pH can affect the growth of organisms, nutrient availability, and affect how much nutrients can be absorbed by plant roots. 5.
What other chemical parameters affect pH?
pH can be affected by pollution produced by industrial power plants and drainage that comes from mines.
Biochemical Oxygen Demand 5-Day (BOD5)
What is BOD5?
This stands for Biochemical Demand for Oxygen.
What does it measure?
BOD5 is a way to measure the amount of oxygen used over 5 days for breaking down the compounds in a water sample. 3.
What types of things when “broken down” contribute to high BOD5 levels? High BOD5 can be traced back to wastewater treatment, DO, and high ammonia. 4.
What problems can result from high BOD5 levels?
High levels of BOD5 can result in low levels of DO, which leads to less oxygen for aquatic organisms and can also be so detrimental that it can cause a die off. 5.
What other chemical parameters are generally associated with high BOD5 levels? The chemical parameter associated with BOD5 is dissolved oxygen. Water Temperature Change
What does testing for water temperature change involve?
Testing for water temperature involves finding how the water changes over a specific amount of time whether it is increasing or decreasing. 2.
What can cause water temperature to change (in particular, what can cause it to increase)? Water temperature can increase when there is more sediment in the water because the heat is trapped there. 3.
What problems result from increases in water temperatures? Problems that comes from increases in water temperature are things such as early migration to escape the rising temperature, make fish more vulnerable to toxic compounds, disease, and parasites, and few animals will be able to...
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