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Plans for Sediment Cap Performance Sampling

Supplementary PDMS/SPME sampling. Plans for Sediment Cap Performance Sampling. Proposed Studies. Deployment of PDMS/SPME Lower detection limits Provides vertical profile Ease of deployment Couple with in-situ bioaccumulation studies

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Plans for Sediment Cap Performance Sampling

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  1. Supplementary PDMS/SPME sampling Plans for Sediment Cap Performance Sampling

  2. Proposed Studies • Deployment of PDMS/SPME • Lower detection limits • Provides vertical profile • Ease of deployment • Couple with in-situ bioaccumulation studies • Potential relationship between interstitial water and organism uptake • Reduce need for future biomonitoring?

  3. Bioaccumulation San Diego Harbor PAHs B(b)F B(k)F BaP in Muscalista

  4. Bioaccumulation San Diego Harbor PAHs B(b)F B(k)F BaP in Muscalista

  5. Relationship between porewater concentration in surficial cap and tissue concentrations PAHs in deposit feeding oligochaete

  6. Bioaccumulation studies • Expected outcome • Relationship between potential bioaccumulation (KowCpw) and actual bioaccumulation • Porewater concentration as indicator of bioavailability (past data suggest useful indicator even if route of uptake is through ingestion and not porewater) • Potential concerns • Corbicula is a filter feeder • Bioaccumulation slow and function of water filtered • Detection limits are potential concern • Organism exposure >> PDMS/SPME deployment

  7. Potential Concerns

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