TY - JOUR
T1 - Discharge of weathering products from acid sulfate soils after a rainfall event, Tweed River, eastern Australia
AU - MacDonald, Bennett C. T.
AU - White, Ian
AU - Astrom, Mats E.
AU - Keene, A. F.
AU - Melville, Michael D.
AU - Reynolds, Jason
PY - 2007
Y1 - 2007
N2 - The oxidation of the iron sulfide, pyrite, in acid sulfate soil floodplains generate substantial acidity and this acid has caused further weathering of the soil profile. The movement of groundwater from these soils is an important geochemical control on surface water quality. The flux of acidified and metal-rich water during a wet season rainfall event has been examined at two study catchments on the Tweed River in eastern Australia. At the sites, 81 kg/ha and 60 kg/ha of oxidisable acidity are exported, along with Al, Fe and Zn during the flood event. The main contributors to the acid flux are H + , Fe and Al at the first site and whilst Fe and Al are present in the drainage waters at the second site, the main contributor is likely to be H + . The different flux characteristics at the sites may be caused by different surface soil hydraulic conductivities and oxidation history.
AB - The oxidation of the iron sulfide, pyrite, in acid sulfate soil floodplains generate substantial acidity and this acid has caused further weathering of the soil profile. The movement of groundwater from these soils is an important geochemical control on surface water quality. The flux of acidified and metal-rich water during a wet season rainfall event has been examined at two study catchments on the Tweed River in eastern Australia. At the sites, 81 kg/ha and 60 kg/ha of oxidisable acidity are exported, along with Al, Fe and Zn during the flood event. The main contributors to the acid flux are H + , Fe and Al at the first site and whilst Fe and Al are present in the drainage waters at the second site, the main contributor is likely to be H + . The different flux characteristics at the sites may be caused by different surface soil hydraulic conductivities and oxidation history.
UR - http://dx.doi.org/10.1016/j.apgeochem.2007.07.004
U2 - 10.1016/j.apgeochem.2007.07.004
DO - 10.1016/j.apgeochem.2007.07.004
M3 - Article
SN - 0883-2927
VL - 22
SP - 2695
EP - 2705
JO - Applied Geochemistry
JF - Applied Geochemistry
IS - 12
ER -
