Total bulk analysis of Hg was conducted using a Milestone DMA-80 direct Hg analyzer, following the ASTM D6722-01 standard method (American Society for Testing and Materials, 2006) in the Geological Survey of Canada. Mercury was also analyzed using a LECO AMA254 mercury analyzer at the University of California, Davis by the same procedure. Gaseous elemental Hg was vaporized from the samples after heating at 800°C and then collected on a gold amalgamation trap for subsequent quantification using atomic absorption spectrometry. The standard reference materials used for this study included the National Institute of Standards and Technology (NIST) 2683B Coal with a certified value of 0.094 ± 0.004 μg/g Hg [laboratory quality control (QC) data, 0.091 ± 0.004 μg/g Hg] and NIST 1633B Fly Ash with a certified value of 0.141 ± 0.019 μg/g Hg (QC data, 0.141 μg/g ± 0.005 μg/g Hg). Duplicate analyses were carried out on nine samples from Stenlille-4 with Hg values ranging from 9.8 to 160.3 ppb with a mean analytical error of ±0.01%. All mercury data are listed in table S9.

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