Reduced Inorganic Sulfur Speciation in Drain Sediments from Acid Sulfate Soil Landscapes
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- 作者：Edward D. Burton ; Richard T. Bush ; and Leigh A. Sullivan
- 刊名：Environmental Science & Technology
- 出版年：2006
- 出版时间：February 1, 2006
- 年：2006
- 卷：40
- 期：3
- 页码：888 - 893
- 全文大小：178K
- 年卷期：v.40,no.3(February 1, 2006)
- ISSN：1520-5851
文摘
We examined processes regulating reduced inorganicsulfur (RIS) speciation in drain sediments from coastal acidsulfate soil (ASS) landscapes. Pore water sulfide wasundetectable or present at low levels (0.6-18.8 
M), consistentwith FeS(s) precipitation in the presence of high concentrations of Fe2+ (generally >2 mM). Acid-volatile sulfide (AVS),with concentrations up to 1019 mol g-1, comprised amajor proportion of RIS. The AVS to pyrite-S ratios wereup to 2.6 in sediment profiles containing abundant reactiveFe (up to ~4000 mol g-1). Such high AVS:pyrite-Sratios are indicative of inefficient conversion of FeS(s) topyrite. This may be due to low pore water sulfide levelscausing slow rates of pyrite formation via the polysulfideand H2S oxidation pathways. Overall, RIS speciation in ASS-associated drain sediments is unique and is largelyregulated by abundant reactive Fe.
M), consistentwith FeS(s) precipitation in the presence of high concentrations of Fe2+ (generally >2 mM). Acid-volatile sulfide (AVS),with concentrations up to 1019 mol g-1, comprised amajor proportion of RIS. The AVS to pyrite-S ratios wereup to 2.6 in sediment profiles containing abundant reactiveFe (up to ~4000 mol g-1). Such high AVS:pyrite-Sratios are indicative of inefficient conversion of FeS(s) topyrite. This may be due to low pore water sulfide levelscausing slow rates of pyrite formation via the polysulfideand H2S oxidation pathways. Overall, RIS speciation in ASS-associated drain sediments is unique and is largelyregulated by abundant reactive Fe.