Mercury speciation and mercury stable isotope composition in sediments from the Canadian Arctic Archipelago.

Total mercury (THg) and monomethylmercury (MMHg) concentrations as well as mercury (Hg) isotope ratios were determined in sediment cores sampled from six locations from the Canadian Arctic Archipelago (CAA). At most sites, THg concentrations showed a decreasing trend with depth, ranging from 5 to 61 ng/g, implicating possible increased Hg deposition and/or riverine inputs in top sediment layers. MMHg values showed large oscillations within the top 10 cm of the cores. This variability decreased at the bottom of the cores with MMHg concentrations ranging from less than12 to up to 1073 pg/g. Average concentrations of THg and MMHg in the top 10 cm were linearly correlated, whereas no correlation was observed with organic matter (loss on ignition). Mercury isotope ratios showed negative values for both δ202Hg (−1.59 to −0.55‰) and Δ199Hg (−0.62 to −0.01‰). δ202Hg values became more negative with depth, while the opposite was observed for Δ199Hg. The former is consistent with predicted historical atmospheric Hg trends as a result of increased coal burning worldwide. Hg isotope ratio measurements in CAA sediments offer additional opportunities to trace Hg processes and sources in the Arctic. Unlabelled Image • Hg, MMHg, and Hg isotope ratios were determined in sediments from Canadian Arctic. • Hg concentrations showed a decreasing trend with depth, ranging from 5 to 61 ng/g. • MMHg values showed large oscillations within the top 10 cm of the cores. • MMHg concentrations appeared to be impacted by a range of processes. • Hg isotope ratios indicate inputs from global coal use. [ABSTRACT FROM AUTHOR]