Acid-volatile sulfide oxidation in coastal flood plain drains: Iron-sulfur cycling and effects on water quality

Edward D. Burton; Richard T. Bush; Leigh A. Sullivan

doi:10.1021/es0520058

Acid-volatile sulfide oxidation in coastal flood plain drains: Iron-sulfur cycling and effects on water quality

Edward D. Burton, Richard T. Bush, Leigh A. Sullivan

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

96 Citations (Scopus)

Abstract

The effect of acid-volatile sulfide (AVS) oxidation on Fe-S cycling and water quality in coastal flood plain drains from acid-sulfate soil landscapes was examined using natural sediments and synthetic iron monosulfide. Oxidation of AVS occurred rapidly (half-time ≤ 1 h) and produced elemental sulfur (S₈⁰_(s)) and iron oxyhydroxide (FeOOH _(s)). The initial rapid AVS oxidation process occurred without significant acidification or changes to the aqueous-phase composition. Severe acidification (pH < 4) occurred only once S₈⁰ _(s) began to oxidize to SO₄ (within 2-3 days of the initial AVS oxidation). Our results demonstrate, for the first time with natural sediments, a significant pH-buffered (near-neutral) AVS oxidation step with the trigger to acidification being the oxidation of S₈⁰ _(s). Acidification resulted in the pH-dependent release of large amounts of Al, Mn, Ni, and Zn even though the sediment metal content was low.

Original language	English
Pages (from-to)	1217-1222
Number of pages	6
Journal	Environmental Science and Technology
Volume	40
Issue number	4
DOIs	https://doi.org/10.1021/es0520058
Publication status	Published - 2006
Externally published	Yes

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abstract = "The effect of acid-volatile sulfide (AVS) oxidation on Fe-S cycling and water quality in coastal flood plain drains from acid-sulfate soil landscapes was examined using natural sediments and synthetic iron monosulfide. Oxidation of AVS occurred rapidly (half-time ≤ 1 h) and produced elemental sulfur (S80(s)) and iron oxyhydroxide (FeOOH (s)). The initial rapid AVS oxidation process occurred without significant acidification or changes to the aqueous-phase composition. Severe acidification (pH < 4) occurred only once S80 (s) began to oxidize to SO4 (within 2-3 days of the initial AVS oxidation). Our results demonstrate, for the first time with natural sediments, a significant pH-buffered (near-neutral) AVS oxidation step with the trigger to acidification being the oxidation of S80 (s). Acidification resulted in the pH-dependent release of large amounts of Al, Mn, Ni, and Zn even though the sediment metal content was low.",

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AU - Bush, Richard T.

AU - Sullivan, Leigh A.

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AB - The effect of acid-volatile sulfide (AVS) oxidation on Fe-S cycling and water quality in coastal flood plain drains from acid-sulfate soil landscapes was examined using natural sediments and synthetic iron monosulfide. Oxidation of AVS occurred rapidly (half-time ≤ 1 h) and produced elemental sulfur (S80(s)) and iron oxyhydroxide (FeOOH (s)). The initial rapid AVS oxidation process occurred without significant acidification or changes to the aqueous-phase composition. Severe acidification (pH < 4) occurred only once S80 (s) began to oxidize to SO4 (within 2-3 days of the initial AVS oxidation). Our results demonstrate, for the first time with natural sediments, a significant pH-buffered (near-neutral) AVS oxidation step with the trigger to acidification being the oxidation of S80 (s). Acidification resulted in the pH-dependent release of large amounts of Al, Mn, Ni, and Zn even though the sediment metal content was low.

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Acid-volatile sulfide oxidation in coastal flood plain drains: Iron-sulfur cycling and effects on water quality

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