Practice Chemical Oxygen Demand (cod) (1) - Chemical Oxygen Demand (COD)

Practice: Chemical Oxygen Demand (COD)

Lesson 1Chemical Oxygen Demand (COD)

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8 questions

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6 questions · about 4 min · pass mark 70%. Hints available.
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2 questions · about 1 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What does COD stand for?
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Think about what we measure concerning oxygen and water.
Question 2.
Is COD dependent on biological processes?
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Consider the method used in COD testing.
3Question 3.
What does COD measure?
- Only biological material
- All organic and inorganic oxidizable materials
- Only carbon content
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Remember what type of materials are oxidized.
4Question 4.
True or False: COD results can be affected by other chemicals in the water.
- True
- False
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Consider the interactions in the test environment.
Question 5.
A wastewater sample shows a COD of 200 mg/L. Upon testing, you find that there are significant levels of sulfides present in the sample. How would you interpret the COD result, and what steps would you recommend to ensure reliability in your assessment?
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Consider the nature of interfering substances and how they could distort your findings.
Question 6.
Discuss how the methodology for measuring COD could be adapted to improve accuracy in cases where interferences are suspected. Consider additional testing regimens or alternative methods.
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Think outside the box about how to handle multiple variables influencing COD results.

4 more questions in this section. Enroll free to practise them all.