Journal article
Reduced inorganic sulphur speciation in drain sediments from acid-sulfate soil landscapes
Environmental Science & Technology, Vol.40(3), pp.888-893
2006
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Abstract
<p>We examined processes regulating reduced inorganic sulfur (RIS) speciation in drain sediments from coastal acid sulfate soil (ASS) landscapes. Pore water sulfide was undetectable or present at low levels (0.6-18.8 M), consistent with FeS<sub>(s)</sub> precipitation in the presence of high concentra tions of Fe<sup>2+</sup> (generally >2 mM). Acid-volatile sulfide (AVS), with concentrations up to 1019 mol g<sup>-1</sup>, comprised a major proportion of RIS. The AVS to pyrite-S ratios were up to 2.6 in sediment profiles containing abundant reactive Fe (up to ~4000 mol g-1). Such high AVS:pyrite-S ratios are indicative of inefficient conversion of FeS<sub>(s)</sub> to pyrite. This may be due to low pore water sulfide levels causing slow rates of pyrite formation via the polysulfide and H<sub>2</sub>S oxidation pathways. Overall, RIS speciation in ASS-associated drain sediments is unique and is largely regulated by abundant reactive Fe.</p>
Details
- Title
- Reduced inorganic sulphur speciation in drain sediments from acid-sulfate soil landscapes
- Creators
- Edward D Burton - Southern Cross UniversityRichard T Bush - Southern Cross UniversityLeigh A Sullivan - Southern Cross University
- Publication Details
- Environmental Science & Technology, Vol.40(3), pp.888-893
- Identifiers
- 1338; 991012820527002368
- Academic Unit
- School of Environment, Science and Engineering; Southern Cross GeoScience; Science; Faculty of Science and Engineering
- Resource Type
- Journal article