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TBT Exposure Assessment in Seafood: Sampling and Findings

This study examines the accuracy of TBT exposure assessment in seafood. The goal of the OT-SAFE project is to assess TBT risk for European consumers using a realistic exposure scenario. The study analyzes consumption data, estimates exposure levels, and evaluates TBT content in different seafood samples. Preliminary findings show that assumptions are supported, although there is still some unexplained variation in concentrations.

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TBT Exposure Assessment in Seafood: Sampling and Findings

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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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