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Bioavailable organic contaminants using silicone passive sampling devices in air and water.
In addition to using low-density polyethylene (LDPE) devices for aqueous sampling in Superfund and Gulf of Mexico projects, we have been optimizing methods and strategies for co-deploying silicone strips with LDPE since 2009. LDPE passive samplers are great for monitoring legacy contaminants, or those typically found in contaminated sites like Superfunds such as PAHs, PCBs, and very hydrophobic pesticides like p’p-DDE and DDT. Silicone is advantageous for co-deployment with LDPE for two reasons: first, it absorbs compounds that are more mobile in water like OPAHs, pesticides like endosulfan sulfate, DEET, and even some pharmaceuticals; secondly, silicone is still able to sequester a many of the same compounds as LDPE, so they can serve as secondary references for each other, and make our conclusions and observations that much stronger!