Seasonal variation in mercury speciation in the Carson River and Lahontan Reservoir
Conference
·
OSTI ID:203597
- Ecology and Environment, Inc., Lancaster, NY (United States)
- Frontier Geosciences Corp., Seattle, WA (United States)
An ecological assessment is being conducted as a component of the remedial investigation/feasibility study (RI/FS) for the Carson River Mercury Site (CRMS), an EPA Superfund site in central west Nevada. The CRMS consists of portions of the Carson River and Washoe Lake drainages that have been affected by mercury (Hg) from the Comstock Lode gold and silver mining operations in the mid- to late 1800`s. Extensive areas of riverine/riparian, reservoir, and wetland habitat downstream from the historic mining district are contaminated with Hg. In support of the risk assessment, water and sediment were collected from the Carson River and Lahontan Reservoir, and from uncontaminated background locations in Nevada, and analyzed for total Hg and Hg species (methyl Hg, ionic Hg, dimethyl Hg, elemental Hg) during drought conditions in September 1994, moderate flow in February 1995, and high flow in May 1995. Seasonal variation in Hg speciation in the Carson River and Lahontan Reservoir was documented, and related to flow conditions, water quality and sediment characteristics, and other factors. A comparison of Hg levels and speciation at the CRMS with those at uncontaminated background locations will be presented.
- OSTI ID:
- 203597
- Report Number(s):
- CONF-9511137--; ISBN 1-880611-03-1
- Country of Publication:
- United States
- Language:
- English
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