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

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

Research output: Contribution to journalArticle

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Abstract

The oxidation of the iron sulfide, pyrite, in acid sulfate soil flood plains 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.
Original languageEnglish
Pages (from-to)2695-2705
Number of pages11
JournalApplied Geochemistry
Volume22
Issue number12
DOIs
Publication statusPublished - 2007

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acid sulfate soil
Weathering
Sulfates
Rain
acidity
weathering
Rivers
Soils
oxidation
rainfall
Acids
iron sulfide
acid
drainage water
Fluxes
river
Acidity
wet season
soil profile
hydraulic conductivity

Cite this

Macdonald, B. C. T., White, I., Åströmb, M. E., Keene, A. F., Melville, M. D., & Reynolds, J. K. (2007). Discharge of weathering products from acid sulfate soils after a rainfall event, Tweed River, eastern Australia. Applied Geochemistry, 22(12), 2695-2705. https://doi.org/10.1016/j.apgeochem.2007.07.004
Macdonald, B.C.T. ; White, I. ; Åströmb, M.E. ; Keene, A.F. ; Melville, M.D. ; Reynolds, J.K. / Discharge of weathering products from acid sulfate soils after a rainfall event, Tweed River, eastern Australia. In: Applied Geochemistry. 2007 ; Vol. 22, No. 12. pp. 2695-2705.
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Macdonald, BCT, White, I, Åströmb, ME, Keene, AF, Melville, MD & Reynolds, JK 2007, 'Discharge of weathering products from acid sulfate soils after a rainfall event, Tweed River, eastern Australia', Applied Geochemistry, vol. 22, no. 12, pp. 2695-2705. https://doi.org/10.1016/j.apgeochem.2007.07.004

Discharge of weathering products from acid sulfate soils after a rainfall event, Tweed River, eastern Australia. / Macdonald, B.C.T.; White, I.; Åströmb, M.E.; Keene, A.F.; Melville, M.D.; Reynolds, J.K.

In: Applied Geochemistry, Vol. 22, No. 12, 2007, p. 2695-2705.

Research output: Contribution to journalArticle

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AU - Macdonald, B.C.T.

AU - White, I.

AU - Åströmb, M.E.

AU - Keene, A.F.

AU - Melville, M.D.

AU - Reynolds, J.K.

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AB - The oxidation of the iron sulfide, pyrite, in acid sulfate soil flood plains 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.

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KW - Measurements

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