Discharge of weathering products from acid sulfate soils after a rainfall event, Tweed River, eastern Australia

B. C.T. Macdonald; I. White; M. E. Åström; A. F. Keene; M. D. Melville; J. K. Reynolds

doi:10.1016/j.apgeochem.2007.07.004

Discharge of weathering products from acid sulfate soils after a rainfall event, Tweed River, eastern Australia

B. C.T. Macdonald^*, I. White, M. E. Åström, A. F. Keene, M. D. Melville, J. K. Reynolds

^*Corresponding author for this work

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Abstract

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. Crown

Original language	English
Pages (from-to)	2695-2705
Number of pages	11
Journal	Applied Geochemistry
Volume	22
Issue number	12
DOIs	https://doi.org/10.1016/j.apgeochem.2007.07.004
Publication status	Published - Dec 2007

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10.1016/j.apgeochem.2007.07.004

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title = "Discharge of weathering products from acid sulfate soils after a rainfall event, Tweed River, eastern Australia",

abstract = "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. Crown",

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AU - Macdonald, B. C.T.

AU - White, I.

AU - Åström, M. E.

AU - Keene, A. F.

AU - Melville, M. D.

AU - Reynolds, J. K.

PY - 2007/12

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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. Crown

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JO - Applied Geochemistry

JF - Applied Geochemistry

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Discharge of weathering products from acid sulfate soils after a rainfall event, Tweed River, eastern Australia

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