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DEVELOPMENT OF A METHOD FOR MEASURING MERCURY (HG) SPECIES USING HG-DIFFUSIVE GRADIENTS IN THIN FILM (DGT) TECHNOLOGY
Paller, M., B. Looney, A. Knox, D. Jackson, N. Halverson, W. Kuhne, and M. Harmon.
Savannah River National Laboratory, 2017 LDRD: Laboratory Directed Research and Development Program, SRNL-STI-2018-00143:18-28(2018)

DGT passive samplers consist of a gel layer, which selectively binds to contaminants, and a diffusion gel, which admits molecules that are available and toxic to organisms. SRNL research in 2017 included one project to measure bioavailable metals by DGT and another to develop methods for measuring Hg by DGT. Metal concentrations measured by DGT probes were correlated with metal toxicity to an aquatic invertebrate, suggesting that DGT can serve as a surrogate for aquatic organisms, although it does not account for all factors that affect bioavailability. A novel reactive DGT probe was also developed that measures only methymercury; a chemical reaction added to the diffusion pathway of the DGT probe modifies and collects inorganic Hg, thereby preventing it from reaching the DGT collection gel. https://srnl.doe.gov/LDRD/pdf/FY17_SRNL_LDRD_Report.pdf



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