Quantification of sulphide oxidation rates in marine sediment

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Quantification of sulphide oxidation rates in marine sediment. / Findlay, Alyssa J.; Pellerin, André; Laufer, Katja; Jørgensen, Bo Barker.

I: Geochimica et Cosmochimica Acta, Bind 280, 07.2020, s. 441-452.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Harvard

Findlay, AJ, Pellerin, A, Laufer, K & Jørgensen, BB 2020, 'Quantification of sulphide oxidation rates in marine sediment', Geochimica et Cosmochimica Acta, bind 280, s. 441-452. https://doi.org/10.1016/j.gca.2020.04.007

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MLA

Findlay, Alyssa J. o.a.. "Quantification of sulphide oxidation rates in marine sediment". Geochimica et Cosmochimica Acta. 2020, 280. 441-452. https://doi.org/10.1016/j.gca.2020.04.007

Vancouver

Author

Findlay, Alyssa J. ; Pellerin, André ; Laufer, Katja ; Jørgensen, Bo Barker. / Quantification of sulphide oxidation rates in marine sediment. I: Geochimica et Cosmochimica Acta. 2020 ; Bind 280. s. 441-452.

Bibtex

@article{979801dfc9854f54a6b55a9298d3282a,
title = "Quantification of sulphide oxidation rates in marine sediment",
abstract = "The marine sulphur cycle is driven by the reduction of sulphate to sulphide coupled to microbial decomposition of organic matter. The sulphide produced by sulphate reduction may either react with Fe or organic matter to be buried as pyrite or organic sulphur, respectively; or may be oxidised through different pathways and intermediates. The amount of sulphide that is oxidised in marine sediments is not well constrained, yet oxidative sulphur cycling has critical implications for hypoxic coastal waters and oxygen minimum zones, carbon mineralisation, microbial metabolism and the interpretation of ancient and modern stable isotope signatures. Here, we present an experimental method to directly determine sulphide oxidation rates in undiluted marine sediment incubations. We find that sulphide oxidation rates in the top two centimetres of organic-rich coastal sediments were greater than rates of sulphide production through sulphate reduction and calculate that in the top 6 centimetres, up to 92 % of sulphide produced during sulphate reduction was reoxidised. The rates decreased steeply with depth, however, and sulphide oxidation to sulphate could no longer be quantified 10 cm below the seafloor. Fe oxides were the primary oxidant for sulphide and the sulphide oxidation rate was related to the amount and reactivity of the Fe minerals. These results provide important insights into the magnitude and processes of the sulphur cycle in marine sediments.",
keywords = "isotope experiments, sulphide oxidation, Sulphur cycle",
author = "Findlay, {Alyssa J.} and Andr{\'e} Pellerin and Katja Laufer and J{\o}rgensen, {Bo Barker}",
year = "2020",
month = jul,
doi = "10.1016/j.gca.2020.04.007",
language = "English",
volume = "280",
pages = "441--452",
journal = "Geochimica et Cosmochimica Acta. Supplement",
issn = "0046-564X",
publisher = "Pergamon Press",

}

RIS

TY - JOUR

T1 - Quantification of sulphide oxidation rates in marine sediment

AU - Findlay, Alyssa J.

AU - Pellerin, André

AU - Laufer, Katja

AU - Jørgensen, Bo Barker

PY - 2020/7

Y1 - 2020/7

N2 - The marine sulphur cycle is driven by the reduction of sulphate to sulphide coupled to microbial decomposition of organic matter. The sulphide produced by sulphate reduction may either react with Fe or organic matter to be buried as pyrite or organic sulphur, respectively; or may be oxidised through different pathways and intermediates. The amount of sulphide that is oxidised in marine sediments is not well constrained, yet oxidative sulphur cycling has critical implications for hypoxic coastal waters and oxygen minimum zones, carbon mineralisation, microbial metabolism and the interpretation of ancient and modern stable isotope signatures. Here, we present an experimental method to directly determine sulphide oxidation rates in undiluted marine sediment incubations. We find that sulphide oxidation rates in the top two centimetres of organic-rich coastal sediments were greater than rates of sulphide production through sulphate reduction and calculate that in the top 6 centimetres, up to 92 % of sulphide produced during sulphate reduction was reoxidised. The rates decreased steeply with depth, however, and sulphide oxidation to sulphate could no longer be quantified 10 cm below the seafloor. Fe oxides were the primary oxidant for sulphide and the sulphide oxidation rate was related to the amount and reactivity of the Fe minerals. These results provide important insights into the magnitude and processes of the sulphur cycle in marine sediments.

AB - The marine sulphur cycle is driven by the reduction of sulphate to sulphide coupled to microbial decomposition of organic matter. The sulphide produced by sulphate reduction may either react with Fe or organic matter to be buried as pyrite or organic sulphur, respectively; or may be oxidised through different pathways and intermediates. The amount of sulphide that is oxidised in marine sediments is not well constrained, yet oxidative sulphur cycling has critical implications for hypoxic coastal waters and oxygen minimum zones, carbon mineralisation, microbial metabolism and the interpretation of ancient and modern stable isotope signatures. Here, we present an experimental method to directly determine sulphide oxidation rates in undiluted marine sediment incubations. We find that sulphide oxidation rates in the top two centimetres of organic-rich coastal sediments were greater than rates of sulphide production through sulphate reduction and calculate that in the top 6 centimetres, up to 92 % of sulphide produced during sulphate reduction was reoxidised. The rates decreased steeply with depth, however, and sulphide oxidation to sulphate could no longer be quantified 10 cm below the seafloor. Fe oxides were the primary oxidant for sulphide and the sulphide oxidation rate was related to the amount and reactivity of the Fe minerals. These results provide important insights into the magnitude and processes of the sulphur cycle in marine sediments.

KW - isotope experiments

KW - sulphide oxidation

KW - Sulphur cycle

UR - http://www.scopus.com/inward/record.url?scp=85084128152&partnerID=8YFLogxK

U2 - 10.1016/j.gca.2020.04.007

DO - 10.1016/j.gca.2020.04.007

M3 - Journal article

AN - SCOPUS:85084128152

VL - 280

SP - 441

EP - 452

JO - Geochimica et Cosmochimica Acta. Supplement

JF - Geochimica et Cosmochimica Acta. Supplement

SN - 0046-564X

ER -