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Effect of Activated Carbon in Thin Sand Caps Challenged with Ongoing PCB Inputs from Sediment Deposition: PCB Uptake in Clams (Mercenaria mercenaria) and Passive Samplers

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Abstract

Ongoing inputs, in the form of sediment deposition along with associated dissolved contaminants, have challenged the assessment of cap performance at contaminated sediment sites. To address this issue, thin 2–3 cm layer sand caps amended with activated carbon (AC) were investigated for the remediation of polychlorinated biphenyl (PCB) contaminated marine sediments using 90-day mesocosms. All treatments were challenged with (1) ongoing clean or marker-PCB-spiked sediment inputs and (2) bioturbation. Bioaccumulation in hard clams (filter feeding near the cap-water interface) was evaluated to best understand cap effectiveness, relative to sheepshead minnows (confined to the surface water) and sandworms (which burrowed through the caps). All caps (sand and AC amended sand) provided isolation of native bedded PCBs (i.e., PCBs sourced from the bed), reducing uptake in organisms. Total PCB bioaccumulation in clams indicated that AC addition to the cap provided no benefit with spiked influx, or some benefit (56% reduction) with clean influx. Spiked input PCBs, when added to the depositional input sediment, were consistently detected in clams and passive samplers, with and without AC in the cap. PCB uptake by passive samplers located in the caps did not reflect the performance of the remedy, as defined by clam bioaccumulation. However, PCB uptake by passive samplers in the overlying water reasonably represented clam bioaccumulation results.

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Acknowledgements

We gratefully acknowledge team members: Natalie S. Rogers, Upal Ghosh, Philipp Mayer, Loretta A. Fernandez, Stine N. Schmidt, and Alice P. Wang for their contributions. We also acknowledge Paul R. Schroeder for reviewing early drafts of this article.

Funding

This work was funded by the US Strategic Environmental Research and Development Program (SERDP, 14 ER03-035/ER-2431).

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Correspondence to Philip T. Gidley.

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The authors declare no conflict of interest associated with this study. Citation of trade names utilized in the present study does not constitute an official endorsement or approval of the use of such commercial products. This article was approved for public release by the US Army Corps of Engineers, Engineer Research and Development Center, chief of engineers.

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Gidley, P.T., Lotufo, G.R., Kennedy, A.J. et al. Effect of Activated Carbon in Thin Sand Caps Challenged with Ongoing PCB Inputs from Sediment Deposition: PCB Uptake in Clams (Mercenaria mercenaria) and Passive Samplers. Arch Environ Contam Toxicol 82, 95–104 (2022). https://doi.org/10.1007/s00244-021-00894-4

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  • DOI: https://doi.org/10.1007/s00244-021-00894-4

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