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Type: Journal article
Title: Climate-driven mobilisation of acid and metals from acid sulfate soils
Author: Simpson, S.
Fitzpatrick, R.
Shand, P.
Angel, B.
Spadaro, D.
Mosley, L.
Citation: Marine and Freshwater Research, 2010; 61(1):129-138
Publisher: C S I R O Publishing
Issue Date: 2010
ISSN: 1323-1650
Statement of
Stuart L. Simpson, Rob W. Fitzpatrick, Paul Shand, Brad M. Angel, David A. Spadaro and Luke Mosley
Abstract: The recent drought in south-eastern Australia has exposed to air, large areas of acid sulfate soils within the River Murray system. Oxidation of these soils has the potential to release acidity, nutrients and metals. The present study investigated the mobilisation of these substances following the rewetting of dried soils with River Murray water. Trace metal concentrations were at background levels in most soils. During 24-h mobilisation tests, the water pH was effectively buffered to the pH of the soil. The release of nutrients was low. Metal release was rapid and the dissolved concentrations of many metals exceeded the Australian water quality guidelines (WQGs) in most tests. The concentrations of dissolved Al, Cu and Zn were often greater than 100× the WQGs and strong relationships existed between dissolved metal release and soil pH. Attenuation of dissolved metal concentrations through co-precipitation and adsorption to Al and Fe precipitates was an important process during mixing of acidic, metal-rich waters with River Murray water. The study demonstrated that the rewetting of dried acid sulfate soils may release significant quantities of metals and a high level of land and water management is required to counter the effects of such climate change events.
Keywords: adsorption; release; water quality guidelines.
Rights: © CSIRO 2010
RMID: 0020106313
DOI: 10.1071/MF09066
Appears in Collections:Soil and Land Systems publications
Environment Institute publications

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