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PAH contamination in shellfish: modelling to estimate exposure.

Aileen C Mill1, Steven P Rushton, Alistair W A Murray

  • 1School of Biology, Newcastle University, Newcastle Upon Tyne, UK. a.c.mill@ncl.ac.uk

Ecotoxicology (London, England)
|October 12, 2011
PubMed
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This study proposes a statistical model to identify key polycyclic aromatic hydrocarbons (PAHs) for monitoring. Focusing on specific PAHs in shellfish provides a better indicator of overall exposure than current methods.

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Area of Science:

  • Environmental Chemistry
  • Food Safety
  • Toxicology

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) are widespread environmental carcinogens found in food.
  • Current monitoring often focuses on benzo[a]pyrene (BaP), neglecting other harmful PAHs.
  • There's a need for efficient methods to assess overall PAH exposure due to monitoring costs and complexity.

Purpose of the Study:

  • To develop a statistical approach for identifying a subset of PAHs as indicators of general PAH exposure.
  • To statistically examine the relationships between various PAHs in foodstuffs, using shellfish as a case study.
  • To propose a more effective monitoring strategy for PAH exposure.

Main Methods:

  • Utilized principal components analysis regression for PAH subset selection.
  • Applied multivariate ordination and clustering to analyze correlations between 27 monitored PAHs.
  • Modeled PAH concentrations to predict the presence and abundance of other PAHs.

Main Results:

  • PAH concentrations of similar chemical structures were found to be highly correlated.
  • A specific subset of PAHs was identified as predictive indicators for general PAH exposure in shellfish.
  • Models showed higher accuracy for PAHs measured above the limit of detection (LoD).

Conclusions:

  • A targeted monitoring approach focusing on specific PAHs (BaP, benzo[a]anthracene, benzo[g,h,i]perylene, phenanthrene, benzo[g,h,i]fluoranthene, chrysene, benzo[k]fluoranthene, benzo[b]fluoranthene, and fluoranthene) is recommended for shellfish.
  • This focused monitoring may offer a more accurate indication of overall PAH content compared to current summed PAH methods.
  • Accurate prediction of PAHs below the LoD remains a challenge.