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Sampling seafood for assessment of TBT exposure : Did we get it right?

Sampling seafood for assessment of TBT exposure : Did we get it right?. Willemsen, FH 1 , Morabito, R 2 , Wegener, JW 1. EU-supported project QLK1-2001-01437 “OT-SAFE” . Aim of OT-SAFE. “to assess the risk of TBT in seafood for European consumers”

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Sampling seafood for assessment of TBT exposure : Did we get it right?

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  1. Sampling seafood for assessment of TBT exposure : Did we get it right? Willemsen, FH1, Morabito, R2, Wegener, JW1 EU-supported project QLK1-2001-01437 “OT-SAFE”

  2. Aim of OT-SAFE • “to assess the risk of TBT in seafood for European consumers” • Tolerable daily intake has been established at (0.25μg/kg bodyweight) • Leaves : • differences in bodyweight (differs with age, sex, geographic region, etc.) • exposure

  3. Estimating the exposure level • Exposure through seafood only -realistic scenario • Exposure = Σ Seafoodt,x * TBT-content t,x • For as many foods as feasible with: • t= time of the catch (if necessary) • x= location (if necessary)

  4. Estimating the exposure level • Necessary data is consumption data • Dutch Seafood Consumption (1997)

  5. Seafood consumption data • Food consumption data

  6. Seafood consumption data (NL)

  7. Sampling strategy • Expected TBT-levels from literature • Consumption figures (as detailed as possible) • Calculate expected relative contribution • If feasible, differentiate for location

  8. Estimating the exposure level • Figures on TBT-content • First estimate (NL-example) based on taxonomic groups and regional specifics:

  9. Estimating the exposure level, example

  10. Sampling procedure 174 samples in total 28 species Almost 50% of samples are molluscs and cephalopods

  11. So did we get it right? • Pro: Preliminary data suggests that the assumptions are born out, e.g. low conc. in pelagic fish • Contra: There is still a spread in concentrations, that we cannot explain

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