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Two publications use DGT for Hg speciation dynamics and bioaccumulation

By 27th February 2022April 6th, 2022No Comments

Different Hg isotopes and DGT were used to establish pathways and bioaccumulation of Hg and CH3Hg in a freshwater wetland, while in another study DGT was used to assess bioavailability and bioaccumulation of Hg in plants within aquatic systems.

Neal-Walthall, N; Ndu, U; Rivera, NA; Elias, DA; Hsu-Kim, H, Utility of Diffusive Gradient in Thin-Film Passive Samplers for Predicting Mercury Methylation Potential and Bioaccumulation in Freshwater Wetlands, Environ. Sci. Technol. 2022, 56, 3, 1743–1752.

DGT was used as a tool to simultaneously quantify the methylation potential of inorganic Hg (IHg) and the bioaccumulation potential of MeHg in freshwater wetlands. Correlations were observed between total Hg-DGT uptake flux and MeHg levels in periphyton biofilms, submergent plant stems, snails, and mosquitofish in the ecosystem. The results demonstrated that DGT passive samplers are a relatively simple and efficient tool for predicting IHg methylation and MeHg bioaccumulation potentials without the need to explicitly delineate IHg and MeHg speciation and partitioning in complex ecosystems.

Pelcova, P; Kopp, R; Ridoskova, A; Grmela, J; Sterbova, D, Evaluation of mercury bioavailability and phytoaccumulation by means of a DGT technique and of submerged aquatic plants in an aquatic ecosystem situated in the vicinity of a cinnabar mine, Chemosphere, 2022, 288, 132545. doi: 10.1016/j.chemosphere.2021.132545.

The ability of three submerged aquatic plants and a natant plant to bioaccumulate mercury was evaluated in a laboratory experiment as well as in a real aquatic ecosystem situated in the vicinity of a cinnabar mine. A strong positive correlation (r > 0.66) was determined between mercury concentration in the input parts (leaves and/or roots) of the aquatic plants and the flow of mercury into DGT units.