Spatial and habitat-rased variations in total and methyl mercury concentrations in surficial sediments in the San Francisco Bay-Delta

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Heim, W. A., Coale, K. H., Stephenson, M., Choe, K. -Y., Gill, G. A., & Foe, C. (2007). Spatial and habitat-rased variations in total and methyl mercury concentrations in surficial sediments in the San Francisco Bay-Delta. Environmental Science and Technology, 41(10), 3501-3507. doi:10.1021/es0626483
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TitleSpatial and habitat-rased variations in total and methyl mercury concentrations in surficial sediments in the San Francisco Bay-Delta
AuthorsW. Heim, K. Coale, M. Stephenson, K. Choe, G. Gill, C. Foe
AbstractRecent studies indicate significant amounts of mercury (Hg) are annually transported into the San Francisco Bay-Delta (Bay-Delta) as a result of historic gold and Hg mining activities. We examined temporal and spatial variation in concentrations of total Hg (HgT) and monomethylmercury (MMHg) in surficial sediments of various ecosystem types in the Bay-Delta. We sampled surficial sediments across the Bay-Delta system and found HgT sediment concentrations in the central Delta were generally 100-200 ng g -1 and increased westward through Suisun Bay to 250-350 ng g -1. MMHg concentrations in the central Delta were between 1 and 3 ng g-1, while those in sediments in the perimeter waterways and adjacent bays were less than 1 ng g-1. Six sites were monitored monthly for over a year to identify seasonal changes in Hg sediment concentrations. Hg T sediment concentrations ranged from 48 to 382 ng g-1 and varied as a function of location not season. However, MMHg concentrations varied seasonally, increasing from 1 ng g-1 during winter months to 6 ng g-1 during spring and summer. Transects conducted at three marshes in the central Delta revealed MMHg sediment concentrations of 4-8 ng g-1at the interior and 2 ng g-1 at the exterior of the marshes. Habitat type was a major factor controlling MMHg concentration and the MMHg to HgT ratio in sediments of the Bay-Delta. MMHg was significantly correlated to HgT (r2 = 0.49) in marsh sediments. © 2007 American Chemical Society.
JournalEnvironmental Science and Technology
Date2007
Volume41
Issue10
Start page3501
End page3507
ISSN0013-936X
SubjectsClimatology, Concentration (process), Mercury (metal), Sediments, Methyl mercury concentrations, Mining activities, Surficial sediments, Soil surveys, methylmercury, methylmercury derivative, concentration (composition), habitat type, mining industry, pollutant transport, seasonal variation, sediment pollution, spatial variation, article, ecosystem, habitat, metal recovery, methylation, nonhuman, sediment, sewage, United States, water pollution, chemistry, season, California, North America, San Francisco Bay, Suisun Bay, Geologic Sediments, Methylmercury Compounds, San Francisco, Seasons
NoteCited By (since 1996):24, Oceanography, CODEN: ESTHA

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