Biogeochemistry of acetate in anoxic sediments of Skan Bay, Alaska

Shaw, David G.; Alperin, Marc J.; Reeburgh, William S.; McIntosh, Douglas J.

doi:10.1016/0016-7037(84)90035-8

Cited by 71 publications

(48 citation statements)

References 28 publications

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“…However, the predicted acetate concentrations in the sulfate-reducing zone were comparable to the dissolved acetate concentrations found in the sulfate-reducing zone of marine sediments (ANSBAEK and BLACKBURN, 1980;BALBA and NEDWELL, 1982;SHAW et al, 1984). Acetate concentrations in the methanogenic zone fell within the wide range of acetate concentrations that have been reported for freshwater methanogenic sediments (MOLONGOSKI and KLUG, 1980;WINFREY and ZEIKUS, 1979;HORDUK and CAPPENBERG, 1983).…”

Section: Resultssupporting

confidence: 68%

Model for the distribution of sulfate reduction and methanogenesis in freshwater sediments

Lovley

Klug

1986

Geochimica et Cosmochimica Acta

290

144

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Abstract-A model, based on the in situ physiological characteristics of methanogens and sulfate reducers, was developed to describe the distribution of methanogenesis and sulfate reduction in freshwater sediments. The model predicted the relative importance of methane production and sulfate reduction in lakes of various trophic status and generated profiles of sulfate, acetate, methanogenesis, and sulfate reduction comparable to the profiles that are expected based on field studies. The model indicated that at sulfate concentrations greater than 30 itM a sulfate-reducing zone develops because sulfate reducers maintain acetate concentrations too low for methanogens to grow. At lower sulfate concentrations a methanogenic zone develops because the dual limitations of low sulfate concentrations and acetate consumption by methanogens prevents sulfate reducers from growing. The model and a compilation of previously published field data indicate that, within the reported range of sulfate concentrations, the relative importance of methanogenesis and sulfate reduction in freshwater sediments is primarily dependent upon the rates of o~nic matter decomposition.describe chemical profiles in the sulfate-reducing and methanogenic zones, and iii) to investigate which factors may be important in controlling the relative importance of sulfate reduction and methanogenesis in the decomposition of organic matter in anaerobic freshwater sediments.

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Section: Resultssupporting

confidence: 68%

Model for the distribution of sulfate reduction and methanogenesis in freshwater sediments

Lovley

Klug

1986

Geochimica et Cosmochimica Acta

290

144

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“…In the homogenization technique, disturbance to the sediment may cause the measured acetate oxidation rate constants to be lower than true values (Shaw et al 1984;Ansbaek and Blackburn 1980). Our homogenization technique tended to give lower values for the oxidation rate constant than did the whole-core injection technique.…”

Section: Resultsmentioning

confidence: 99%

“…Acetate oxidation rate constants for other samples were determined with a core injection technique (Shaw et al 1984;Christensen and Blackburn 1982;Ansbaek and Blackburn 1980). Uniformly labeled [14C]acetate was injected (in a lo-p1 aliquot containing lo4 or lo5 dpm) through selfsealing silicone rubber-stoppered holes along one side of a 2.5-cm-diam core liner.…”

Section: Methodsmentioning

confidence: 99%

“…Many workers have concluded that the analytically measured, or total, acetate concentration is larger than the bioavailable acetate pool (Parkes et al 1984;Shaw et al 1984;Christensen and Blackburn 1982).…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…The first-order rate constant derived from these measurements is then multiplied by the ambient total dissolved acetate concentration to obtain an in situ oxidation rate (Sansone 1986;Lovley and Klug 1982;Ansbaek and Blackburn 1980;Winfrey and Zeikus 1979). In many cases such acetate oxidation rates exceed those predicted from measured rates of sulfate reduction or ammonium production (Shaw et al 1984;Christensen and ' Now at the Department of Geography, Boston University, Boston, Massachusetts.…”

mentioning

confidence: 96%

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Modeling the distribution of acetate in anoxic estuarine sediments

Michelson

Jacobson

Scranton

et al. 1989

Limnology & Oceanography

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Concentrations and rates of production and oxidation of acetate were studied in anoxic, estuarine sediments of Flax Pond, New York. Molecular weight separations by Sephadex gel indicated that in some, but not all, casts pore-water acetate consisted of multiple "pools." We developed a onedimensional kinetic model that uses measured oxidation rates (14C-labeled acetate conversion to 14C0,) and production rates (MoO,~-inhibition experiments) as model parameters. Appropriate diffusion coefficients were calculated with a free-solution value (1.3 +0.3 x 1 Op5 cm2 s-l) measured in this study. In general, oxidation rate constants estimated from modeled profiles agree well with those from [ 14C]acetate incubation experiments. Results imply that differences in acetate oxidation rates inferred from the two methods (MoO,~-inhibition, [14C]acetate oxidation) can be caused by diffusion of acetate along sharp concentration gradients in sediments.[14C]acetate uptake experiments account for such diffusion by using measured steady state acetate concentrations to infer oxidation rates, whereas MoO,~-inhibition experiments do not account for in situ acetate diffusion.

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Geochemical control processes and potential sediment toxicity in a mine‐impacted lake

Adeleke

Svensson

Yekta

et al. 2016

Enviro Toxic and Chemistry

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Geochemical parameters and major ion concentrations from sediments of a freshwater lake in the town of Åtvidaberg, southeastern, Sweden, were used to identify the geochemical processes that control the water chemistry. The lake sediments are anoxic, characterized by reduced sulfur and sulfidic minerals. The hypothesis tested is that in sulfidic-anaerobic contaminated sediments, the presence of redox potential changes creates a favorable condition for sulfide oxidation, resulting in the release of potentially toxic metals. The acid volatile sulfide (AVS) contents ranged from 5.5 μmol/g to 16 μmol/g of dry sediment. Comparison of total mine tailing metals (∑mine tailing metals) with simultaneously extracted metals (SEM) in sediments indicates that up to 20% of the ∑mine tailing metals are bound to the solid phase as AVS. Consequently, the AVS and SEM analysis classified all sediment samples as potentially toxic in terms of heavy metal concentrations (i.e., SEM to AVS ratio distribution > 1). Evaluation of hydrogeochemical data suggests that calcite dissolution, iron (III) oxyhydroxysulfate mineral jarosite (H-jarosite) precipitation, hematite precipitation, and siderite precipitation are the most prevailing geochemical processes that control the geochemical interactions between the water column and sediment in a mine-impacted lake. The geochemical processes were verified and quantified using a chemical equilibrium modeling program, Visual MINTEQ, Ver 3.1, beta. The identified geochemical processes create an environment in which the characteristics of sulfate-rich waters and acidic-iron produce the geochemical conditions for acid mine drainage and mobilization of toxic metals.

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Biogeochemistry of acetate in anoxic sediments of Skan Bay, Alaska

Cited by 71 publications

References 28 publications

Model for the distribution of sulfate reduction and methanogenesis in freshwater sediments

Model for the distribution of sulfate reduction and methanogenesis in freshwater sediments

Modeling the distribution of acetate in anoxic estuarine sediments

Geochemical control processes and potential sediment toxicity in a mine‐impacted lake

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