Uptake Mechanisms of a Novel, Activated Carbon-Based Equilibrium Passive Sampler for Estimating Porewater Methylmercury

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dc.contributor.authorWashburn, Spencer J.
dc.contributor.authorDamond, Jada
dc.contributor.authorSanders, James P.
dc.contributor.authorGilmour, Cynthia C.
dc.contributor.authorGhosh, Upal
dc.date.accessioned2022-07-14T22:55:07Z
dc.date.available2022-07-14T22:55:07Z
dc.date.issued2022-06-14
dc.description.abstractHere we describe the validation of a novel polymeric equilibrium passive sampler comprised of agarose gel with embedded activated carbon particles (ag+AC), to estimate aqueous monomethylmercury (MeHg) concentrations. Sampler behavior was tested using a combination of idealized media and realistic sediment microcosms. Isotherm bottle experiments with ag+AC polymers were conducted to constrain partitioning to these materials by various environmentally relevant species of MeHg bound to dissolved organic matter (MeHgDOM) across a range of sizes and character. Partitioning coefficients ranged from log(Kps) = 1.98±0.09 for MeHg bound to Suwannee River Humic Acid to log(Kps) = 3.15±0.0.52 for MeHg complexed with Upper Mississippi River Natural Organic Matter. Reversible equilibrium exchange of environmentally relevant MeHg species was demonstrated through a series of dual isotope labeled exchange experiments. Isotopically labeled MeHgDOM species approached equilibrium in the samplers over 14 d while mass balance was maintained, providing strong evidence the ag+AC polymer material is capable of equilibrium measurements of environmentally relevant MeHg species within a reasonable deployment time frame. Samplers deployed across the sediment-water interface of sediment microcosms estimated both overlying water and porewater MeHg concentrations within a factor of 2 to 4 of measured values, based on the average measured Kps values for species of MeHg bound to natural organic matter (MeHgNOM) in the isotherm experiments. Taken together, our results indicate that ag+AC polymers, used as equilibrium samplers, can provide accurate MeHg estimations across many site chemistries, with a simple back calculation based on a standardized Kps.en_US
dc.description.sponsorshipThe authors acknowledge funding support from the Strategic Environmental Research Development Program (ER-2540) and the National Institute of Environmental Health Sciences' R01 program (R01ES024284). The authors would like to thank Ally Soren, Tyler Bell, and David Sean Hartnett for their generous assistance in analyzing samples at SERC.en_US
dc.description.urihttps://setac.onlinelibrary.wiley.com/doi/abs/10.1002/etc.5406en_US
dc.format.extent46 pagesen_US
dc.genrejournal articlesen_US
dc.genrepostprintsen_US
dc.identifierdoi:10.13016/m2uool-kjkp
dc.identifier.citationWashburn, S.J., Damond, J., Sanders, J.P., Gilmour, C.C. and Ghosh, U. (2022), Uptake Mechanisms of a Novel, Activated Carbon-Based Equilibrium Passive Sampler for Estimating Porewater Methylmercury. Environ Toxicol Chem. Accepted Author Manuscript. https://doi.org/10.1002/etc.5406en_US
dc.identifier.urihttps://doi.org/10.1002/etc.5406
dc.identifier.urihttp://hdl.handle.net/11603/25161
dc.language.isoen_USen_US
dc.publisherWileyen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Chemical, Biochemical & Environmental Engineering Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Student Collection
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleUptake Mechanisms of a Novel, Activated Carbon-Based Equilibrium Passive Sampler for Estimating Porewater Methylmercuryen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-4072-7058en_US

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