Factors Influencing OCP Degradation in Freshwater Environments
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Questions and Answers

How does sorption in soil affect the mobility of Organochlorine Pesticides (OCPs)?

  • Increases mobility
  • Reduces mobility (correct)
  • Has no effect on mobility
  • Causes immediate degradation
  • Which of the following is NOT a degradation pathway for OCPs?

  • Redox reactions
  • Photolysis
  • Hydrolysis
  • Fermentation (correct)
  • Which environmental condition favors the reduction reaction in the degradation of OCP residues?

  • Low iron content
  • Low oxygen levels (correct)
  • High pH
  • Neutral pH
  • What type of compounds are hydrolyzed through the hydrolysis pathway?

    <p>Esters</p> Signup and view all the answers

    How does photolysis contribute to the degradation of OCP residues?

    <p>Direct photolysis contributes to degradation</p> Signup and view all the answers

    What role does microbial population play in the biotic degradation of OCP residues?

    <p>It accelerates the degradation by providing energy</p> Signup and view all the answers

    What is the role of water in photochemical reactions?

    <p>Creates hydroxyl radicals</p> Signup and view all the answers

    Which compound can organisms convert OCPs into as part of detoxification or metabolic processes?

    <p>Trichloroacetic acid (TCAA)</p> Signup and view all the answers

    In what form can Methylosinus trichosporium OB3b produce methane monooxygenase to convert trichloroethylene?

    <p>Trichloroacetic acid (TCAA)</p> Signup and view all the answers

    What do hydroxyl radicals participate in within photochemical reactions?

    <p>Mediating xenobiotic transformation</p> Signup and view all the answers

    Which process is NOT involved in the photochemical reactions mentioned in the text?

    <p>Halogenation</p> Signup and view all the answers

    What can soil extracts with halogenating potential contribute to the formation of from organic acids like humic acid?

    <p>Trichloroacetic acid (TCAA)</p> Signup and view all the answers

    Which process influences the degradation of OCPs due to their association with micro-organic compounds?

    <p>Sorption and binding by organic soil components</p> Signup and view all the answers

    What is a significant property of OCPs that contributes to their high stability against degradation in the environment?

    <p>Low solubility in water</p> Signup and view all the answers

    Which organisms tend to accumulate OCPs and are an important part of the food chain?

    <p>Benthic organisms like crabs and shrimps</p> Signup and view all the answers

    What is one important factor influencing the residue levels of OCPs in sediment?

    <p>Particle size distribution</p> Signup and view all the answers

    Which process could contribute to the degradation of OCP residues through exposure to light?

    <p>Volatilization and photodecomposition</p> Signup and view all the answers

    What is a key role of microorganisms in the degradation of OCP residues?

    <p>Contributing to biotic degradation</p> Signup and view all the answers

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