Iron monosulfide enrichment and the presence of organosulfur in eutrophic estuarine sediments

Morgan, Bree; Burton, Edward D; Rate, Andrew W.

doi:10.1016/j.chemgeo.2011.12.005

Cited by 63 publications

(48 citation statements)

References 72 publications

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“…These results are similar to those reported by Morgan et al (2012) who showed that high organic carbon content in estuarine sediments can lead to the stabilization of a significant fraction of the RIS pool as AVS. Furthermore, the relationships of TOC-AVS, TOC-CRS, and TOC-ES for fluvial sediment exhibit statistically significant positive correlations (P \ 0.001), suggesting that TOC controls sulfate reduction and formation of sulfides (Fig.…”

Section: Avs Crs and Es In Sedimentsupporting

confidence: 82%

“…Interactions and limiting components of these cycles within different formation environments can dictate the geochemistry of the sulfidic material formed (Morgan et al 2012). Therefore, inorganic sulfur speciation may be important as a diagnostic tool for sediment conditions during early diagenesis.…”

Section: Introductionmentioning

confidence: 99%

“…Although sulfate and Fe(III) reduction along with the microbially mediated formation of sulfide minerals can increase alkalinity and reduce metal availability (Burton et al 2005;Mortimer et al 2011), oxidation of sedimentary sulfide during sediment resuspension may cause rapid deoxygenation and acidification of overlying water, posing an environmental hazard (Morse and Rickard 2004;Sullivan et al 2002). Therefore, in addition to potentially recording information about the environment of deposition, sulfur geochemistry may play an important role in affecting estuarine sediment and water quality (Anthony et al 2010;Morgan et al 2012).…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry of reduced inorganic sulfur, reactive iron, and organic carbon in fluvial and marine surface sediment in the Laizhou Bay region, China

et al. 2015

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Understanding the geochemical cycling of sulfur in sediments is important because it can have implications for both modern environments (e.g., deterioration of water quality) and interpretation of the ancient past (e.g., sediment C/S ratios can be used as indicators of palaeodepositional environment). This study investigates the geochemical characteristics of sulfur, iron, and organic carbon in fluvial and coastal surface sediments of the Laizhou Bay region, China. A total of 63 sediment samples were taken across the whole Laizhou Bay marine region and the 14 major tidal rivers draining into it. Acid volatile sulfur, chromium (II)-reducible sulfur and elemental sulfur, total organic carbon, and total nitrogen were present in higher concentrations in the fluvial sediment than in the marine sediment of Laizhou Bay. The composition of reduced inorganic sulfur in surface sediments was dominated by acid volatile sulfur and chromium (II)-reducible sulfur. In fluvial sediments, sulfate reduction and formation of reduced inorganic sulfur were controlled by TOC and reactive iron synchronously. High C/S ratios in the marine sediments indicate that the diagenetic processes in Laizhou Bay have been affected by rapid deposition of sediment from the Yellow River in recent decades.

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Section: Avs Crs and Es In Sedimentsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geochemistry of reduced inorganic sulfur, reactive iron, and organic carbon in fluvial and marine surface sediment in the Laizhou Bay region, China

et al. 2015

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“…As in other organic-rich freshwater and marine sediments (Huertadiaz et al, 1993;Huertadiaz and Morse, 1992), the peat deposit studied here, being of estuarine/marine origin, would provide the sulfur and nucleation sites for pyrite formation and growth. A high organic carbon concentration promotes the formation -and actually the persistence of -iron sulfides in sediments (Morgan et al, 2012;Morse and Wang, 1997). A slowing of iron monosulfides-to-pyrite transformation kinetics through passivation by DOC or As(III) may occur over decadal timescales (Wilkin and Ford, 2006), allowing more time for arsenic to coprecipitate with the pyrite -the predominant host of co-precipitated As and the most stable among iron sulfides (Kirk et al, 2010).…”

Section: Arsenic Speciation and Retentionmentioning

confidence: 99%

Peat formation concentrates arsenic within sediment deposits of the Mekong Delta

Stuckey

Schaefer

Kocar

et al. 2015

Geochimica et Cosmochimica Acta

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This is an author-produced, peer-reviewed version of this article. The final, definitive version of this document can be found online at Geochimica et Cosmochimica Acta, published by Elsevier. Copyright restrictions may apply. doi: 10.1016/j.gca.2014.10.021 Mekong River Delta sediment bears arsenic that is released to groundwater under anaerobic conditions over the past several thousand years. The oxidation state, speciation, and distribution of arsenic and the associated iron bearing phases are crucial determinants of As reactivity in sediments. Peat from buried mangrove swamps in particular may be an important host, source, or sink of arsenic in the Mekong Delta. The total concentration, speciation, and reactivity of arsenic and iron were examined in sediments in a Mekong Delta wetland by X-ray fluorescence spectrometry (XRF), X-ray absorption spectroscopy (XA S), and selective chemical extractions. Total solid-phase arsenic concentrations in a peat layer at a depth of 6 m below ground increased 10-fold relative to the overlying sediment. Extended X-ray absorption fine structure (EXAFS) spectroscopy revealed that arsenic in the peat was predominantly in the form of arsenian pyrite. Arsenic speciation in the peat was examined further at the micron-scale using XRF and X-ray absorption near-edge structure (XANES) spectroscopy coupled with principal component analysis. The multiple energy XRF mapping and XANES routine was repeated for both iron and sulfur phase analyses. Our XRF/ XANES analyses confirm arsenic association with pyrite -a less reactive host phase than iron (hydr)oxides under anaerobic conditions. The arsenian pyrite likely formed upon deposition/formation of the peat in a past estuarine environment (~ 5.5 ka BP), a process that is not expected under current geochemical conditions. Presently, arsenian pyrite is neither a source nor a sink for aqueous arsenic in our sediment profile, and under present geochemical conditions represents a stable host of As under the reducing aquifer conditions of the Mekong Delta. AbstractThis is an author-produced, peer-reviewed version of this article. The final, definitive version of this document can be found online at Geochimica et Cosmochimica Acta, published by Elsevier.

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“…[21][22][23][24] Sulde is toxic to aquatic organisms. Its accumulation in upper sediment layers in coastal areas exerts an impact upon not only local benthos but also the pelagic biota due to the potential release of free sulde into the water column.…”

Section: Introductionmentioning

confidence: 99%

Reduced inorganic sulfur in surface sediment and its impact on benthic environments in offshore areas of NE China

Sheng

Sun

Bottrell

et al. 2015

Environ. Sci.: Processes Impacts

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Iron monosulfide enrichment and the presence of organosulfur in eutrophic estuarine sediments

Cited by 63 publications

References 72 publications

Geochemistry of reduced inorganic sulfur, reactive iron, and organic carbon in fluvial and marine surface sediment in the Laizhou Bay region, China

Geochemistry of reduced inorganic sulfur, reactive iron, and organic carbon in fluvial and marine surface sediment in the Laizhou Bay region, China

Peat formation concentrates arsenic within sediment deposits of the Mekong Delta

Reduced inorganic sulfur in surface sediment and its impact on benthic environments in offshore areas of NE China

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