The Adsorption and Release of Sulfur in Mineral and Organic Soils of the Athabasca Oil Sands Region, Alberta, Canada
- C. J. Whitfield *a,
- A. Adkinsonb,
- M. C. Eimersc and
- S. A. Watmoughd
- a Environmental and Resource Studies Dep., Trent Univ., 1600 West Bank Dr., Peterborough, ON, K9J 7B8, Canada
b Dep. of Geography and Environmental Studies, Carleton Univ., 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canada
c Dep. of Geography, Trent Univ., 1600 West Bank Dr., Peterborough, ON, K9J 7B8, Canada
d Environmental and Resource Studies Dep., Trent Univ., 1600 West Bank Dr., Peterborough, ON, K9J 7B8, Canada. Assigned to Associate Editor Greg Evanylo
Mineral soil and fibric peat from acid-sensitive western boreal catchments in the Athabasca Oil Sands Region of Alberta, Canada were evaluated for their ability to adsorb and release SO4 2− Laboratory batch studies indicated that SO4 2− adsorption in mineral soil from both the A and B horizons exhibits a limited response to elevated SO4 2− concentrations, with the slope of initial mass isotherms <0.2 for all soils, likely due to low iron and aluminum oxide content. Although S retention is the dominant process in peat soils in the region, drought simulations in the lab using fibric peat collected from a poor fen exhibited as much as a five-fold increase in SO4 2− concentration after drying and rewetting. Given the limited SO4 2− adsorption capacity of mineral soils and the potential drought-induced S release from peatlands in this region where increased S deposition is expected, further investigation of acidification impacts is warranted.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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