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Comparison of three fish bioaccumulation models for ecological and human risk assessment and validation with field data

Comparison of three fish bioaccumulation models for ecological and human risk assessment and validation with field data. Hana Smítková, Jan Hendriks, Mark Huijbregts. Bioaccumulation models are integrated: because of financial, practical and ethical constrains

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Comparison of three fish bioaccumulation models for ecological and human risk assessment and validation with field data

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  1. Comparison of three fish bioaccumulation models for ecological and human risk assessment and validation with field data Hana Smítková, Jan Hendriks, Mark Huijbregts

  2. Bioaccumulation models are integrated: • because of financial, practical and ethical constrains • for estimating environmental transport • for estimating human exposure • like tools that can be used for: • rapid and • quantitative assessment of the hazards and risks organic substances • Fish bioaccumulation models, which were compared: • human exposure: • EUSES • CalTOX • environmental exposure: • OMEGA

  3. The concentration in fish can be calculated: • Q represents: • the bioconcentration factor for fish (BCFfish) • in models EUSES and CalTOX • the bioaccumulation factor (BAFfish) • in model OMEGA • CalTOX • seven compartment multimedia human exposure model • is a risk assessment model that integrates a multimedia environmental fate model with a multiple pathway exposure • the bioconcentration factor of fish in CalTOX is taken from Mackay (1982):

  4. EUSES • European Union System for the Evaluation of Substances, version 2.0 • is designed to facilitate the risk assessment of a broad range of substances • is based on the EU Technical Guidance documents • if log Kow ≤ 6 then: • if log Kow > 6 then:

  5. OMEGA • is based on classical fugacity theory • is based for accumulation kinetics of organic substances as a function: • of the octanol-water partition ratio • of the chemical • of the weight, • of the lipid content, • of trophic level of the species • the basic equation for OMEGA is given by: • in case of steady state, this gives:

  6. Scheme of fresh water and marine food chain applied in this comparison

  7. all models are virtually similar up to a log Kow of 6 • for substances with a log Kow higher than 6 the curve of model EUSES decreases parabolic • OMEGA bioaccumulation outcomes approximately show a linear increase • the OMEGA-outcomes are close to the fish bioconcentration outcomes of the model CalTOX

  8. To compare the fish bioaccumulation model with measured field data, the organism-suspended matter concentration ratio was calculated by:

  9. comparison of three models: • EUSES • CalTOX • OMEGA - primary carnivores (5% lipid content) • with chemicals compounds from: • ■ chlorobiocides • ● chlorobiphenyls • ▲ halobenzenes • for fresh water fish Rutilus rutilus

  10. comparison of three models: • EUSES • CalTOX • OMEGA - primary carnivores (5% lipid content) • with chemicals compounds from: • ●chlorobiphenyls • + haloalkanes • x phenylethers • for marine fishes Ammodytes species, Chasmichthys gulosus, Clupeidae, Clupea harengus, Eutriglia gurnardus, Osmerus eperlanus and Pleuronectes platessa

  11. comparison of three models: • EUSES • CalTOX • OMEGA - lean secondary carnivores (5% lipid content) • with chemicals compounds from: • ● chlorobiphenyls • + haloalkanes • x phenylethers • for marine fishes Gadus morhua, Merlangius merlangus, Platichthys flesus, Pollachius virens, Solea solea and Trisopterus luscus

  12. comparison of three models: • EUSES • CalTOX • OMEGA - fat secondary carnivores (20% lipid content) • OMEGA - fat secondary carnivores(20% lipid content) depends on BCF from water only • with chemicals compounds from: • ■ chlorobiocides • ● chlorobiphenyls • ▲ halobenzenes • ♦ nitrobenzenes • for fresh water fish with 20% lipid content Anguilla anguilla

  13. Conclusion • All models are similar up to a log Kow 6. • For more hydrophobic compounds (log Kow > 6), the models EUSES and OMEGA, based on water exposure only, decrease parabolic. • OMEGA curves with food as an additional exposure route are almost linear. • These OMEGA curves are very close to those of the model CalTOX. • The comparison to field data show that assimilation from food needs to be incorporated. • Incorporation of lipid content improves exposure assessment for human and ecological risks substantially, because lipid content of fish is also very important. • Empirical organism-suspended matter concentration ratios do not confirm the difference between primary and secondary carnivores.

  14. Thank you for your attention

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