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DEVELOPMENT OF A NOVEL EQUILIBRIUM PASSIVE SAMPLING DEVICE FOR METHYLMERCURY IN SEDIMENT AND SOIL POREWATERS
Sanders, J.P., A. McBurney, C.C. Gilmour, G.E. Schwartz, S. Washburn, S.B.K. Driscoll, et al.
Environmental Toxicology and Chemistry 39(2):323-334(2020)
An equilibrium passive sampler was developed to predict the concentration of the chemically labile fraction of MeHg in sediment porewaters based on equilibrium partitioning into the sampler, without modeling diffusion rates through the sampler material. Candidate materials tested included a range of polymers embedded with suitable sorbents for MeHg. One of the most promising was activated carbon (AC) embedded in agarose. Sampler equilibration time in sediments was ~1-2 weeks. AC exhibited relatively rapid desorption of Hg and MeHg, indicating that it is capable of reversible, equilibrium measurements. In sediment:water microcosms, porewater concentrations made with isotherm-calibrated passive samplers agreed within a factor of 2 (unamended sediment) or 4 (AC-amended sediment) with directly measured concentrations.
Environmental Toxicology and Chemistry 39(2):323-334(2020)
An equilibrium passive sampler was developed to predict the concentration of the chemically labile fraction of MeHg in sediment porewaters based on equilibrium partitioning into the sampler, without modeling diffusion rates through the sampler material. Candidate materials tested included a range of polymers embedded with suitable sorbents for MeHg. One of the most promising was activated carbon (AC) embedded in agarose. Sampler equilibration time in sediments was ~1-2 weeks. AC exhibited relatively rapid desorption of Hg and MeHg, indicating that it is capable of reversible, equilibrium measurements. In sediment:water microcosms, porewater concentrations made with isotherm-calibrated passive samplers agreed within a factor of 2 (unamended sediment) or 4 (AC-amended sediment) with directly measured concentrations.
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