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#           Mercury loading and methylmercury production and cycling in high-altitude lakes from the Western United States      

      January 1, 2002    

Studies worldwide have shown that mercury (Hg) is a ubiquitous contaminant, reaching even the most remote environments such as high-altitude lakes via atmospheric pathways. However, very few studies have been conducted to assess Hg contamination levels of these systems. We sampled 90 mid-latitude, high-altitude lakes from seven national parks in the western United States during a four-week period in September 1999. In addition to the synoptic survey, routine monitoring and experimental studies were conducted at one of the lakes (Mills Lake) to quantify MeHg fluxrates and important process rates such as photo-demethylation. Results show that overall, high-altitude lakes have low total mercury (HgT) and methylmercury (MeHg) levels (1.07 and 0.05 ng L-1, respectively), but a very good correlation of Hg to MeHg (r2= 0.82) suggests inorganic Hg(II) loading is a primary controlling factor of MeHg levels in dilute mountain lakes. Positive correlations were also observed for dissolved organic carbon (DOC) and both Hg and MeHg, although to a much lesser degree. Levels of MeHg were similar among the seven national parks, with the exception of Glacier National Park where lowerconcentrations were observed (0.02 ng L-1), and appear to be related to naturally elevated pH values there. Measured rates ofMeHg photo-degradation at Mills Lake were quite fast, and this process was of equal importance to sedimentation and stream flow for removing MeHg. Enhanced rates of photo-demethylation are likely an important reason why high-altitude lakes, with typically high water clarity and sunlight exposure, are low in MeHg.

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#### David P Krabbenhoft

##### Scientist Emeritus

Mercury Research Laboratory

Mercury Research Laboratory

dpkrabbe@usgs.gov

608-335-4234

####             John F DeWild (Former Employee)          

##### Hydrologic Technician

Upper Midwest Water Science Center

####             David W Clow (Former Employee)          

##### Research Hydrologist

Colorado Water Science Center

#### Rob Striegl

##### Emeritus Research Hydrologist

Water Resources Mission Area

rstriegl@usgs.gov

303-541-3091

####             Mark M Dornblaser (Former Employee)          

##### Chemist

Water Resources Mission Area

## Related Content

#### David P Krabbenhoft

##### Scientist Emeritus

Mercury Research Laboratory

Mercury Research Laboratory

dpkrabbe@usgs.gov

608-335-4234

####             John F DeWild (Former Employee)          

##### Hydrologic Technician

Upper Midwest Water Science Center

####             David W Clow (Former Employee)          

##### Research Hydrologist

Colorado Water Science Center

#### Rob Striegl

##### Emeritus Research Hydrologist

Water Resources Mission Area

rstriegl@usgs.gov

303-541-3091

####             Mark M Dornblaser (Former Employee)          

##### Chemist

Water Resources Mission Area

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