PLANS FOR SEDIMENT CAP PERFORMANCE SAMPLING

Supplementary PDMS/SPME sampling

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?

PAHsB(b)FB(k)FBaP in Muscalista

BioaccumulationSan Diego Harbor

Bioaccumulation San Diego Harbor

PAHsB(b)FB(k)FBaP in Muscalista

Relationship between porewater concentration in surficial cap and tissue concentrations

PAHs in deposit feeding oligochaete

10

100

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1000000

10 100 1000 10000 100000 1000000

Pre

dic

ted

Tis

sue

Con

cen

trat

ion

,C

w*

Kow

(ng/

g)

Measured Tissue Concentration (ng/g)

PHE

PYR

CHR

BAA

BBF

BKF

BAP

model

1:1

Predicted = Measured0.972

r2 = 0.884

best fit

1:1

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

Potential Concerns