Journal article
Acid-volatile sulfide oxidation in coastal floodplain drains: iron-sulfur cycling and effects on water quality
Environmental Science & Technology, Vol.40(4), pp.1217-1222
2006
Metrics
22 Record Views
Abstract
<p>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 (S<sub>8</sub><sup>0</sup><sub>(s)</sub>) and iron oxyhydroxide (FeOOH<sub>(s)</sub>). The initial rapid AVS oxidation process occurred without significant acidification or changes to the aqueous-phase composition. Severe acidification (pH < 4) occurred only once S<sub>8</sub><sup>0</sup><sub>(s)</sub> began to oxidize to SO<sub>4</sub> (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 S<sub>8</sub><sup>0</sup><sub>(s)</sub>. Acidification resulted in the pH-dependent release of large amounts of Al, Mn, Ni, and Zn even though the sediment metal content was low.</p>
Details
- Title
- Acid-volatile sulfide oxidation in coastal floodplain drains: iron-sulfur cycling and effects on water quality
- Creators
- Edward D Burton - Southern Cross UniversityRichard T Bush - Southern Cross UniversityLeigh A Sullivan - Southern Cross University
- Publication Details
- Environmental Science & Technology, Vol.40(4), pp.1217-1222
- Identifiers
- 1337; 991012821348902368
- Academic Unit
- School of Environment, Science and Engineering; Southern Cross GeoScience; Faculty of Science and Engineering; Science
- Resource Type
- Journal article