Wetland influence on mercury fate and transport in a temperate forested watershed

被引:90
|
作者
Selvendiran, Pranesh [1 ]
Driscoll, Charles T. [1 ]
Bushey, Joseph T. [1 ]
Montesdeoca, Mario R. [1 ]
机构
[1] Syracuse Univ, Dept Civil & Environm Engn, Syracuse, NY 13244 USA
基金
美国国家科学基金会;
关键词
mercury; methyl mercury; sulfate; dissolved organic carbon; wetland; retention; season; Huntington forest;
D O I
10.1016/j.envpol.2007.12.005
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The transport and fate of mercury (Hg) was studied in two forest wetlands; a riparian peatland and an abandoned beaver meadow. The proportion of total mercury (THg) that was methyl mercury (% MeHg) increased from 2% to 6% from the upland inlets to the outlet of the wetlands. During the growing season, MeHg concentrations were approximately three times higher (0.27 ng/L) than values during the non-growing season (0.10 ng/L). Transport of Hg species was facilitated by DOC production as indicated by significant positive relations with THg and MeHg. Elevated concentrations of MeHg and % MeHg (as high as 70%) were found in pore waters of the riparian and beaver meadow wetlands. Groundwater interaction with the stream was limited at the riparian peatland due to the low hydraulic conductivity of the peat. The annual fluxes of THg and MeHg at the outlet of the watershed were 2.3 and 0.092 mu g/m(2) year respectively. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:46 / 55
页数:10
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