Oxidation and incorporation of hydrogen sulfide by dissolved organic matter

Heitmann, Tobias; Blodau, Christian

doi:10.1016/j.chemgeo.2006.05.011

Cited by 165 publications

(142 citation statements)

References 30 publications

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“…7) are likely the consequence of the following groundwater-related processes: (i) direct inputs of dissolved nitrate and sulfate; (ii) oxidation of porewater and/or particulate sulfides by oxygenated groundwater; and (iii) dissolved phosphate dilution by phosphate-poor groundwater. Additionally, fast chemical oxidation of porewater dissolved sulfides by dissolved OM, as experimentally observed for organic-rich anoxic sediments by Heitmann and Blodau (2006), could also enhance the production of dissolved sulfate at depth in the sediment. Higher porewater sulfate enrichment in Lake Shirokoe compared to the two other lakes (Fig.…”

Section: Transient Redox Conditionsmentioning

confidence: 97%

Organic matter mineralization and trace element post-depositional redistribution in Western Siberia thermokarst lake sediments

et al. 2011

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Abstract. This study reports the very first results on highresolution sampling of sediments and their porewaters from three thermokarst (thaw) lakes representing different stages of ecosystem development located within the Nadym-Pur interfluve of the Western Siberia plain. Up to present time, the lake sediments of this and other permafrost-affected regions remain unexplored regarding their biogeochemical behavior. The aim of this study was to (i) document the early diagenesic processes in order to assess their impact on the organic carbon stored in the underlying permafrost, and (ii) characterize the post-depositional redistribution of trace elements and their impact on the water column. The estimated organic carbon (OC) stock in thermokarst lake sediments of 14 ± 2 kg m −2 is low compared to that reported for peat soils from the same region and denotes intense organic matter (OM) mineralization. Mineralization of OM in the thermokarst lake sediments proceeds under anoxic conditions in all the three lakes. In the course of the lake development, a shift in mineralization pathways from nitrate and sulfate to Fe-and Mn-oxyhydroxides as the main terminal electron acceptors in the early diagenetic reactions was suggested. This shift was likely promoted by the diagenetic consumption of nitrate and sulfate and their gradual depletion in the water column due to progressively decreasing frozen peat lixiviation occurring at the lake's borders. Trace elements were mobilized from host phases (OM and Fe-and Mn-oxyhydroxides) and partly sequestered in the sediment in the form of authigenic Fe-sulfides. Arsenic and Sb cycling was also closely linked to that of OM and Fe-and Mnoxyhydroxides. Shallow diagenetic enrichment of particulate Sb was observed in the less mature stages. As a result of auCorrespondence to: S. Audry (stephane.audry@get.obs-mip.fr) thigenic sulfide precipitation, the sediments of the early stage of ecosystem development were a sink for water column Cu, Zn, Cd, Pb and Sb. In contrast, at all stages of ecosystem development, the sediments were a source of dissolved Co, Ni and As to the water column. However, the concentrations of these trace elements remained low in the bottom waters, indicating that sorption processes on Fe-bounding particles and/or large-size organo-mineral colloids could mitigate the impact of post-depositional redistribution of toxic elements on the water column.

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Section: Transient Redox Conditionsmentioning

confidence: 97%

Organic matter mineralization and trace element post-depositional redistribution in Western Siberia thermokarst lake sediments

et al. 2011

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“…From a thermodynamic perspective, reduction of AQDS is more favorable than methanogenesis, which should lead to an increase in the CO 2 :CH 4 ratio in soils where AQDS-like humics are being used for microbial respiration; however, direct inhibition of methanogenesis by AQDS-like humics is also possible (Cervantes et al, 2000). Recent research in a Canadian peatland demonstrated that dissolved organic matter is an important electron acceptor, contributing directly (through humic reduction) or indirectly (by regenerating oxidized sulfur species for sulfate reduction) to high CO 2 :CH 4 ratios (Heitmann and Blodau, 2006;Heitmann et al, 2007). Although the total electron accepting capacity of dissolved humic substances was relatively small, it was hypothesized that the much larger pool of humic-like organic matter in the solid phase of wetland soils could be used in a similar manner (Heitmann and Blodau, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Recent research in a Canadian peatland demonstrated that dissolved organic matter is an important electron acceptor, contributing directly (through humic reduction) or indirectly (by regenerating oxidized sulfur species for sulfate reduction) to high CO 2 :CH 4 ratios (Heitmann and Blodau, 2006;Heitmann et al, 2007). Although the total electron accepting capacity of dissolved humic substances was relatively small, it was hypothesized that the much larger pool of humic-like organic matter in the solid phase of wetland soils could be used in a similar manner (Heitmann and Blodau, 2006). Scott et al (1998) also demonstrated that the electron accepting capacity of humic substances extracted from soils was much greater than dissolved humic substances across a number of aquatic systems.…”

Section: Introductionmentioning

confidence: 99%

Humic acids as electron acceptors in wetland decomposition

Keller

Weisenhorn

Megonigal

2009

Soil Biology and Biochemistry

159

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“…Both pathways are plausible. Sulfurizaiton of organic matter is well documented (Brown, 1986;Heitmann and Blodau, 2006;Kohnen et al, 1991;Urban et al, 1999), and methanogenesis involves multiple different organosulfur compounds, including some with high S-to-C ratios (e.g., coenzyme M has an S-to-C ratio of 1). Biochemical investigations 10 have revealed that organosulfur compounds are concomitantly oxidized as other carbon substrates are reduced into methane (Thauer, 1998).…”

Section: Carbon Transformations Between Day 18 and Day 85 Of Incubationmentioning

confidence: 99%

“…Organosulfur compounds form in organic, sulfate-reducing environments where reduced sulfide species can react with various types of organic matter (Heitmann and Blodau, 2006;Perlinger et al, 2002;Schouten et al, 1993). As such, organosulfur compounds have been 15 detected in various anaerobic environments (Brown, 1986;Urban et al, 1999).…”

Section: Composition Of Mobilized Sedimentary Organic Carbonmentioning

confidence: 99%

Molecular characterization of organic matter mobilized from Bangladeshi aquifer sediment: tracking carbon compositional change during microbial utilization

Pracht¹,

Tfaily²,

Ardissono³

et al. 2017

Preprint

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Abstract. Bioavailable organic carbon in aquifer-recharge waters and sediments can fuel microbial reactions with 10 implications for groundwater quality. A previous incubation experiment showed that sedimentary organic carbon (SOC) mobilized off sandy sediment collected from an arsenic-contaminated and methanogenic aquifer in Bangladesh was bioavailable; it was fermented into methane. We used high-resolution mass spectrometry to molecularly characterize this mobilized SOC, reference its composition against dissolved organic carbon (DOC) in aquifer recharge water, track compositional changes during incubation, and advance understanding of how composition relates to bioavailability in 15 anaerobic conditions. Mobilized SOC was more diverse and proportionately larger, more aromatic and more oxidized than DOC in surface recharge. In all samples, ~50% of identified compounds contained sulfur. After SOC was fermented into methane, new organosulfur compounds with high S-to-C ratios and high nominal oxidation state of carbon (NOSC) were detected. We conjecture these detected compounds were microbially synthesized to biochemically support methane production or they formed abiotically following microbial sulfate reduction, which could have occurred during incubation 20 but was not directly measured. Microbes transformed all carbon types during incubation, including those considered molecularly recalcitrant (e.g., condensed aromatics) and thermodynamically unfavourable to oxidize (e.g., low NOSC).While all compound types were eventually degraded, NOSC and compound size controlled the rates of carbon transformation. Large energy-rich compounds (e.g., aromatics with high NOSC) were targeted first while small energy-poor compounds (e.g., alkanes and olefinics with low NOSC) persisted. Preferential use of aromatic compounds, which are 25 typically considered molecularly recalcitrant, demonstrates that in the anaerobic conditions of the incubation, thermodynamic favourability of carbon oxidation rather than molecular structure controlled the rate of carbon degradation by microbes.Biogeosciences Discuss., https://doi

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Oxidation and incorporation of hydrogen sulfide by dissolved organic matter

Cited by 165 publications

References 30 publications

Organic matter mineralization and trace element post-depositional redistribution in Western Siberia thermokarst lake sediments

Organic matter mineralization and trace element post-depositional redistribution in Western Siberia thermokarst lake sediments

Humic acids as electron acceptors in wetland decomposition

Molecular characterization of organic matter mobilized from Bangladeshi aquifer sediment: tracking carbon compositional change during microbial utilization

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