Date: 12 Oct 2007
Mercury and Organic Carbon Dynamics During Runoff Episodes from a Northeastern USA Watershed
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Mercury and organic carbon concentrations vary dynamically in streamwater at the Sleepers River Research Watershed in Vermont, USA. Total mercury (THg) concentrations ranged from 0.53 to 93.8 ng/L during a 3-year period of study. The highest mercury (Hg) concentrations occurred slightly before peak flows and were associated with the highest organic carbon (OC) concentrations. Dissolved Hg (DHg) was the dominant form in the upland catchments; particulate Hg (PHg) dominated in the lowland catchments. The concentration of hydrophobic acid (HPOA), the major component of dissolved organic carbon (DOC), explained 41–98% of the variability of DHg concentration while DOC flux explained 68–85% of the variability in DHg flux, indicating both quality and quantity of the DOC substantially influenced the transport and fate of DHg. Particulate organic carbon (POC) concentrations explained 50% of the PHg variability, indicating that POC is an important transport mechanism for PHg. Despite available sources of DHg and wetlands in the upland catchments, dissolved methylmercury (DmeHg) concentrations in streamwaters were below detection limit (0.04 ng/L). PHg and particulate methylmercury (PmeHg) had a strong positive correlation (r 2 = 0.84, p < 0.0001), suggesting a common source; likely in-stream or near-stream POC eroded or re-suspended during spring snowmelt and summer storms. Ratios of PmeHg to THg were low and fairly constant despite an apparent higher methylmercury (meHg) production potential in the summer. Methylmercury production in soils and stream sediments was below detection during snowmelt in April and highest in stream sediments (compared to forest and wetland soils) sampled in July. Using the watershed approach, the correlation of the percent of wetland cover to TmeHg concentrations in streamwater indicates that poorly drained wetland soils are a source of meHg and the relatively high concentrations found in stream surface sediments in July indicate these zones are a meHg sink.
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- Mercury and Organic Carbon Dynamics During Runoff Episodes from a Northeastern USA Watershed
Water, Air, and Soil Pollution
Volume 187, Issue 1-4 , pp 89-108
- Cover Date
- Print ISSN
- Online ISSN
- Springer Netherlands
- Additional Links
- Dissolved mercury
- Particulate mercury
- Dissolved methylmercury
- Particulate methylmercury
- Organic carbon
- Dissolved organic carbon
- Particulate organic carbon
- Hydrophobic organic acid
- Sleepers River
- Industry Sectors
- Author Affiliations
- 1. U.S. Geological Survey, 3215 Marine Street, Suite E-127, Boulder, CO, 80303, USA
- 2. U.S. Geological Survey, P.O. Box 628, Montpelier, VT, 05601, USA
- 3. U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA, 94025, USA
- 4. U.S. Geological Survey, 8505 Research Way, Middleton, WI, 53562, USA