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Interrelations between iron extractability and phosphate sorption in reflooded air-dried sediments

Qiu, S. and McComb, A.J. (2002) Interrelations between iron extractability and phosphate sorption in reflooded air-dried sediments. Hydrobiologia, 472 (1/3). pp. 39-44.

Link to Published Version: http://dx.doi.org/10.1023/A:1016317100164
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Abstract

To understand the effects of drying on phosphorus sorption properties of wetland sediment, the acid ammonium oxalate and citrate-dithionite-bicarbonate (CDB) extractions were applied to sediments from seven shallow lakes near Perth, Western Australia. Air-drying generally led to a marked increase in oxalate- and CDB-extractable Fe, but not in extractable-Al which varied less than 2%. Air-drying also induced changes in equilibrium concentration, labile potential and sorption capacity of phosphorus in reflooded sediments. These were accompanied by changes in pH, turbidity, E440 and soluble Fe3+ in the water. The FeOx/FeCDB ratios of wet and air-dried sediments suggested an increase in iron crystallinity upon drying, correlated with the decrease in P-sorption capacity (R2= 0.72, p < 0.05).

Item Type: Journal Article
Murdoch Affiliation: School of Environmental Science
Publisher: Kluwer Academic Publishers
URI: http://researchrepository.murdoch.edu.au/id/eprint/7589
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