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Title: Binding of mercury(II) to reduced sulfur in soil organic matter along upland-peat soil transects

Abstract

The binding of Hg{sup 2+} in organic matter of soils and waters controls the transport and transformations of Hg in terrestrial and aquatic ecosystems. The authors developed a competitive complexation method using the strong complexation of Hg{sup 2+} by Br{sup {minus}} for determining the Hg{sup 2+} binding strength in organic soils at native and elevated Hg concentrations. The distribution coefficients determined in KBr suspensions for sorption of native HG{sup 2+} to soil organic carbon (SOC) (K{sub soc}) are in the range of 10{sup 22} to 10{sup 23}. The K{sub soc} significantly decreased with increased additions of Hg{sup 2+} and with decreasing pH. Using data for reduced organic S concentrations determined by x-ray absorption near-edge structure spectroscopy (XANES), the authors calculated surface complex formation constants on the order of 10{sup 32} for a model site having acidity constants of mercaptoacetic acid. This value is in fair agreement with the tabulated value of 10{sup 345} for Hg{sup 2+} binding in mercaptoacetic acid. At native Hg concentrations, formation constants and K{sub soc} values were similar for different types of soil organic matter along transects from uplands into wetlands, despite varying concentration of Hg and reduced organic S. Their adsorption data are consistent withmore » the conclusions from their previous extended x-ray absorption fine structure spectroscopy (EXAFS) study that in a humic acid and soil, Hg{sup 2+} ions bond in two-fold coordination involving one reduced S and one O or N.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Univ. of Minnesota, St. Paul, MN (US)
OSTI Identifier:
20080428
Resource Type:
Journal Article
Journal Name:
Journal of Environmental Quality
Additional Journal Information:
Journal Volume: 29; Journal Issue: 3; Other Information: PBD: May-Jun 2000; Journal ID: ISSN 0047-2425
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; MERCURY; SOILS; ORGANIC MATTER; SOIL CHEMISTRY; ENVIRONMENTAL TRANSPORT; ORGANIC SULFUR COMPOUNDS; WETLANDS

Citation Formats

Skyllberg, U., Xia, K., Bloom, P.R., Nater, E.A., and Bleam, W.F. Binding of mercury(II) to reduced sulfur in soil organic matter along upland-peat soil transects. United States: N. p., 2000. Web. doi:10.2134/jeq2000.00472425002900030022x.
Skyllberg, U., Xia, K., Bloom, P.R., Nater, E.A., & Bleam, W.F. Binding of mercury(II) to reduced sulfur in soil organic matter along upland-peat soil transects. United States. doi:10.2134/jeq2000.00472425002900030022x.
Skyllberg, U., Xia, K., Bloom, P.R., Nater, E.A., and Bleam, W.F. Thu . "Binding of mercury(II) to reduced sulfur in soil organic matter along upland-peat soil transects". United States. doi:10.2134/jeq2000.00472425002900030022x.
@article{osti_20080428,
title = {Binding of mercury(II) to reduced sulfur in soil organic matter along upland-peat soil transects},
author = {Skyllberg, U. and Xia, K. and Bloom, P.R. and Nater, E.A. and Bleam, W.F.},
abstractNote = {The binding of Hg{sup 2+} in organic matter of soils and waters controls the transport and transformations of Hg in terrestrial and aquatic ecosystems. The authors developed a competitive complexation method using the strong complexation of Hg{sup 2+} by Br{sup {minus}} for determining the Hg{sup 2+} binding strength in organic soils at native and elevated Hg concentrations. The distribution coefficients determined in KBr suspensions for sorption of native HG{sup 2+} to soil organic carbon (SOC) (K{sub soc}) are in the range of 10{sup 22} to 10{sup 23}. The K{sub soc} significantly decreased with increased additions of Hg{sup 2+} and with decreasing pH. Using data for reduced organic S concentrations determined by x-ray absorption near-edge structure spectroscopy (XANES), the authors calculated surface complex formation constants on the order of 10{sup 32} for a model site having acidity constants of mercaptoacetic acid. This value is in fair agreement with the tabulated value of 10{sup 345} for Hg{sup 2+} binding in mercaptoacetic acid. At native Hg concentrations, formation constants and K{sub soc} values were similar for different types of soil organic matter along transects from uplands into wetlands, despite varying concentration of Hg and reduced organic S. Their adsorption data are consistent with the conclusions from their previous extended x-ray absorption fine structure spectroscopy (EXAFS) study that in a humic acid and soil, Hg{sup 2+} ions bond in two-fold coordination involving one reduced S and one O or N.},
doi = {10.2134/jeq2000.00472425002900030022x},
journal = {Journal of Environmental Quality},
issn = {0047-2425},
number = 3,
volume = 29,
place = {United States},
year = {2000},
month = {6}
}