Criteria for Total Ammonia Toxicity and Control Strategies
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Questions and Answers

What is the pH range for which criteria have been established for total ammonia by the EPA?

  • 5.0 to 8.0
  • 7.5 to 10.0
  • 4.0 to 7.0
  • 6.5 to 9.0 (correct)

    • Which form of ammonia is considered less toxic than NH3?

  • Nitrates (NO3 -)
  • Ammonium (NH4 +) (correct)
  • Ammonia gas (NH3)
  • Nitrogen (N)

    • What is the water temperature range for which criteria have been established for total ammonia by the EPA?

  • -5 to 5 °C
  • 20 to 40 °C
  • -10 to 15 °C
  • 0 to 30 °C (correct)

    • Which substances are considered hazardous due to their toxicity, persistence, bioaccumulation potential, and effects like carcinogenicity?

    <p>Phosphorus compounds</p> Signup and view all the answers

    In accordance with the precautionary principle, what type of substances are many countries taking into account when developing water quality criteria?

    <p>Genetically modified organisms</p> Signup and view all the answers

    What region of the United Nations is mentioned to be increasing attention to developing water quality criteria for hazardous substances?

    <p>United Nations Economic and Social Commission for Asia and the Pacific (ESCAP) region</p> Signup and view all the answers

    What is the reason behind using a 3-day BOD in the tropics instead of a 5-day BOD?

    <p>Faster results are needed due to warmer temperatures in the tropics</p> Signup and view all the answers

    Which activity does NOT rely on water quality for safe use?

    <p>Protection of Aquatic Life</p> Signup and view all the answers

    What is one of the criteria mentioned for suitable water quality for livestock watering?

    <p>Avoiding heavy growth of blue-green algae</p> Signup and view all the answers

    Based on the Canadian and Nigerian criteria, which variable has different values set for water quality?

    <p>Blue-green algae</p> Signup and view all the answers

    What action is recommended if necessary to ensure water quality for livestock watering?

    <p>Chlorinate the water</p> Signup and view all the answers

    What is emphasized to prevent contamination of water supply sources for livestock watering?

    <p>Manure management</p> Signup and view all the answers

    What is the recommended BOD level for salmonid waters according to the European Union Council Directive?

    <p>4 mg O2 l-1</p> Signup and view all the answers

    What is the interim water quality criterion for BOD in Nigeria for the protection of aquatic life?

    <p>3 mg O2 l-1</p> Signup and view all the answers

    What is the BOD criterion for irrigation water in Nigeria?

    <p>2 mg O2 l-1</p> Signup and view all the answers

    What concentration of BOD should not be exceeded in Class A waters for the River Ganga in India?

    <p>2 mg O2 l-1</p> Signup and view all the answers

    What are the water quality criteria set for phosphorus compounds to prevent excessive growth of algae?

    <p>&lt; 3 mg O2 l-1</p> Signup and view all the answers

    What is the recommended BOD level for cyprinid waters according to the European Union Council Directive?

    <p>4 mg O2 l-1</p> Signup and view all the answers

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