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Issues in Risk Assessment (1993) / Chapter Skim
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Discussion
Pages 300-300

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From page 300...
... A nonlinear relationship between loading and toxicant concentrations might occur if the toxicant reaches high enough concentrations to change the processes that control its own fate. For example, reduction in fish populations might allow for higher populations of zooplankton, which clarify the water column by decreasing populations of phytoplankton, thereby increasing photolysis rates and stabilizing pH.
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Key Terms

  • exposed species
  • processes include
  • formal uncertainty
  • uncertainty analysis
  • tcdd safe

  • boundary layer
  • traditional human
  • toxicant concentrations
  • water clarity
  • omitted processes

  • photolysis rates
  • assumed linear
  • benchmark value
  • environmental concentrations
  • lowest reported

  • soil concentrations
  • increasing photolysis
  • reported loaels
  • toxicant reaches
  • health assessments

  • corresponding benchmark
  • thereby increasing
  • linear relationship
  • highly exposed
  • benthic boundary

  • heavily exposed
  • estimate soil
  • risk assessment
  • human health
  • paper sludges


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