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Mercury in a Boreal Forest Stream - Role of Historical Mercury Pollution, TOC, Temperature, and Water Discharge

Regnell, Olof LU ; Watras, Carl J.; Troedsson, Bo; Helgee, Anders and Hammar, Tommy (2009) In Environmental Science & Technology 43(10). p.3514-3521
Abstract
Over a one-year study period (2003), we monitored total Hg (HgT) and methyl Hg (MeHg) at two sites in a Swedish forest stream located above (Site(ref)) and below a stretch of Hg-contaminated sediments (Site(Hg)). We also monitored HgT, MeHg, and ancillary water chemistry in peat water close to the stream and HgT in open field wet deposition. Despite the presence of historical Hg contaminants, direct atmospheric Hg deposition and transfer of Hg from the catchment explained more than half of the annual HgT load at Site(Hg). The concentrations of both HgT and MeHg were sensitive to changes in water discharge (Q) and water temperature (T) at both sites, suggesting that the stream HgT and MeHg load can change dramatically in response to... (More)
Over a one-year study period (2003), we monitored total Hg (HgT) and methyl Hg (MeHg) at two sites in a Swedish forest stream located above (Site(ref)) and below a stretch of Hg-contaminated sediments (Site(Hg)). We also monitored HgT, MeHg, and ancillary water chemistry in peat water close to the stream and HgT in open field wet deposition. Despite the presence of historical Hg contaminants, direct atmospheric Hg deposition and transfer of Hg from the catchment explained more than half of the annual HgT load at Site(Hg). The concentrations of both HgT and MeHg were sensitive to changes in water discharge (Q) and water temperature (T) at both sites, suggesting that the stream HgT and MeHg load can change dramatically in response to changing weather conditions. The 2003 data together with data from 1996 disclosed intersite differences and temporal variation in the relationships between HgT, MeHg, and TOC (total organic carbon), reflecting variable sources of HgT, MeHg, and TOC and temporal changes in factors affecting Hg speciation. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Environmental Science & Technology
volume
43
issue
10
pages
3514 - 3521
publisher
The American Chemical Society
external identifiers
  • wos:000266046700021
  • scopus:66249147227
ISSN
1520-5851
DOI
10.1021/es802991x
language
English
LU publication?
yes
id
32b485cd-3897-44b3-8d4e-3db954c97e4f (old id 1426187)
date added to LUP
2009-06-26 13:24:00
date last changed
2017-01-29 03:52:15
@article{32b485cd-3897-44b3-8d4e-3db954c97e4f,
  abstract     = {Over a one-year study period (2003), we monitored total Hg (HgT) and methyl Hg (MeHg) at two sites in a Swedish forest stream located above (Site(ref)) and below a stretch of Hg-contaminated sediments (Site(Hg)). We also monitored HgT, MeHg, and ancillary water chemistry in peat water close to the stream and HgT in open field wet deposition. Despite the presence of historical Hg contaminants, direct atmospheric Hg deposition and transfer of Hg from the catchment explained more than half of the annual HgT load at Site(Hg). The concentrations of both HgT and MeHg were sensitive to changes in water discharge (Q) and water temperature (T) at both sites, suggesting that the stream HgT and MeHg load can change dramatically in response to changing weather conditions. The 2003 data together with data from 1996 disclosed intersite differences and temporal variation in the relationships between HgT, MeHg, and TOC (total organic carbon), reflecting variable sources of HgT, MeHg, and TOC and temporal changes in factors affecting Hg speciation.},
  author       = {Regnell, Olof and Watras, Carl J. and Troedsson, Bo and Helgee, Anders and Hammar, Tommy},
  issn         = {1520-5851},
  language     = {eng},
  number       = {10},
  pages        = {3514--3521},
  publisher    = {The American Chemical Society},
  series       = {Environmental Science & Technology},
  title        = {Mercury in a Boreal Forest Stream - Role of Historical Mercury Pollution, TOC, Temperature, and Water Discharge},
  url          = {http://dx.doi.org/10.1021/es802991x},
  volume       = {43},
  year         = {2009},
}