Author: Hurley, JP; Benoit, JM; Babiarz, CL; Shafer, MM; Andren, AW; Sullivan, JR; Hammond, R; Webb, DA
Description: Total and monomethyl mercury were measured at 39 river sites in Wisconsin during fall 1992 and spring 1993. Using a Geographic Information System (GIS), we delineated watersheds with unique and homogeneous physical characteristics. Mean unfiltered total Hg (HgT) was higher in spring (7.94 ng L-1) than in fall (3.45 ng L-1). Major differences in HgT yields were observed among various land-use groupings. In wetland/forest watersheds, elevated HgT fluxes were associated with the filtered phase, while in agricultural watersheds, increased HgT fluxes were due to particle loading. Monomethylmercury (MeHg) yields from wetland/forest sites were higher than agricultural/forest sites and agricultural only sites. Percent wetland surface area was positively correlated with MeHg yield. These results identify the importance of land use and land cover in influencing Hg concentrations, speciation, and transport in rivers.
Subject headings: Mercury; Watershed; Rivers; GIS; Monomethylmercury; Land use; Land cover
Publication year: 1995
Journal or book title: Environmental science & technology
Volume: 29
Issue: 7
Pages: 1867-1875
Find the full text: https://pubs.acs.org/doi/pdf/10.1021/es00007a026
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Serial number: 4189