Acidification and Buffering Mechanisms in Acid Sulfate Soil Wetlands of the Murray-Darling Basin, Australia

Fiona Glover; Kerry L. Whitworth; Peter Kappen; Darren S. Baldwin; Gavin N. Rees; John A. Webb; Ewen Silvester

doi:10.1021/es103535k

Acidification and Buffering Mechanisms in Acid Sulfate Soil Wetlands of the Murray-Darling Basin, Australia

Fiona Glover, Kerry L. Whitworth, Peter Kappen, Darren S. Baldwin, Gavin N. Rees, John A. Webb, Ewen Silvester

Agricultural, Environmental and Veterinary Sciences

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

The acid generation mechanisms and neutralizing capacities of sulfidic sediments from two inland wetlands have been studied in order to understand the response of these types of systems to drying events. The two systems show vastly different responses to oxidation, with one (Bottle Bend (BB) lagoon) having virtually no acid neutralizing capacity (ANC) and the other (Psyche Bend (PB) lagoon) an ANC that is an order of magnitude greater than the acid generation potential. While BB strongly acidifies during oxidation the free acid generation is less than that expected from the measured proton production and consumption processes, with additional proton consumption attributed to the formation of an acid-anion (chloride) FeIII (oxyhydr)oxide product, similar to akaganéite (Fe(OH)2.7Cl0.3). While such products can partially attenuate the acidification of these systems, resilience to acidification is primarily imparted by sediment ANC.

Original language	English
Pages (from-to)	2591-2597
Number of pages	7
Journal	Environmental Science & Technology
Volume	45
Issue number	7
DOIs	https://doi.org/10.1021/es103535k
Publication status	Published - 01 Apr 2011

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title = "Acidification and Buffering Mechanisms in Acid Sulfate Soil Wetlands of the Murray-Darling Basin, Australia",

abstract = "The acid generation mechanisms and neutralizing capacities of sulfidic sediments from two inland wetlands have been studied in order to understand the response of these types of systems to drying events. The two systems show vastly different responses to oxidation, with one (Bottle Bend (BB) lagoon) having virtually no acid neutralizing capacity (ANC) and the other (Psyche Bend (PB) lagoon) an ANC that is an order of magnitude greater than the acid generation potential. While BB strongly acidifies during oxidation the free acid generation is less than that expected from the measured proton production and consumption processes, with additional proton consumption attributed to the formation of an acid-anion (chloride) FeIII (oxyhydr)oxide product, similar to akagan{\'e}ite (Fe(OH)2.7Cl0.3). While such products can partially attenuate the acidification of these systems, resilience to acidification is primarily imparted by sediment ANC.",

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AU - Glover, Fiona

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AU - Kappen, Peter

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AU - Rees, Gavin N.

AU - Webb, John A.

AU - Silvester, Ewen

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N2 - The acid generation mechanisms and neutralizing capacities of sulfidic sediments from two inland wetlands have been studied in order to understand the response of these types of systems to drying events. The two systems show vastly different responses to oxidation, with one (Bottle Bend (BB) lagoon) having virtually no acid neutralizing capacity (ANC) and the other (Psyche Bend (PB) lagoon) an ANC that is an order of magnitude greater than the acid generation potential. While BB strongly acidifies during oxidation the free acid generation is less than that expected from the measured proton production and consumption processes, with additional proton consumption attributed to the formation of an acid-anion (chloride) FeIII (oxyhydr)oxide product, similar to akaganéite (Fe(OH)2.7Cl0.3). While such products can partially attenuate the acidification of these systems, resilience to acidification is primarily imparted by sediment ANC.

AB - The acid generation mechanisms and neutralizing capacities of sulfidic sediments from two inland wetlands have been studied in order to understand the response of these types of systems to drying events. The two systems show vastly different responses to oxidation, with one (Bottle Bend (BB) lagoon) having virtually no acid neutralizing capacity (ANC) and the other (Psyche Bend (PB) lagoon) an ANC that is an order of magnitude greater than the acid generation potential. While BB strongly acidifies during oxidation the free acid generation is less than that expected from the measured proton production and consumption processes, with additional proton consumption attributed to the formation of an acid-anion (chloride) FeIII (oxyhydr)oxide product, similar to akaganéite (Fe(OH)2.7Cl0.3). While such products can partially attenuate the acidification of these systems, resilience to acidification is primarily imparted by sediment ANC.

U2 - 10.1021/es103535k

DO - 10.1021/es103535k

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JF - Environmental Science & Technology

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Acidification and Buffering Mechanisms in Acid Sulfate Soil Wetlands of the Murray-Darling Basin, Australia

Abstract

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