Document Detail

Subsurface sources of methyl mercury to Lake Superior from a wetland-forested watershed.
MedLine Citation:
PMID:  16337675     Owner:  NLM     Status:  MEDLINE    
Identification of sites of methyl mercury (MeHg) production is critical to predicting long-term fate of bioaccumulative Hg in the aquatic environment. During baseflow, when groundwater sources dominate, we observed consistently elevated levels of MeHg (0.1-0.4 ng L(-1)) at the mouth and in several tributaries to the Tahquamenon River in the Lake Superior watershed. MeHg concentrations in groundwater observation wells exceeded 0.6 ng L(-1) in a coniferous catchment with highly conductive sandy surficial deposits. Furthermore, we identified MeHg concentrations as high as 12 ng L(-1) in the hyporheic zone of East Creek, a tributary to the Tahquamenon. This study confirms the importance of groundwater as a source of MeHg in watersheds of the Great Lakes. Indirect groundwater discharge represents a major component of flow in rivers of the basin, further emphasizing the need to better understand subsurface MeHg production and transport processes when modeling watershed responses and biogeochemical fate of Hg in the Great Lakes.
Richard W Stoor; James P Hurley; Christopher L Babiarz; David E Armstrong
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2005-12-07
Journal Detail:
Title:  The Science of the total environment     Volume:  368     ISSN:  0048-9697     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-08-07     Completed Date:  2006-11-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  99-110     Citation Subset:  IM    
University of Wisconsin-Madison, Environmental Chemistry and Technology Program, Madison, WI 53706-1481, USA.
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MeSH Terms
Carbon / analysis
Environmental Monitoring
Fresh Water
Mercury / analysis
Methylmercury Compounds / analysis*
Water Movements*
Water Pollutants, Chemical / analysis*
Water Supply*
Reg. No./Substance:
0/Methylmercury Compounds; 0/Water Pollutants, Chemical; 7439-97-6/Mercury; 7440-44-0/Carbon

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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