Evidence of molybdenum association with particulate organic matter under sulfidic conditions

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Evidence of molybdenum association with particulate organic matter under sulfidic conditions. / Dahl, T. W.; Chappaz, Anthony; Hoek, J.B.; McKenzie, Christine J.; Svane, S.; Canfield, D. E.

In: Geobiology, Vol. 15, No. 2, 2017, p. 311-323.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Dahl, TW, Chappaz, A, Hoek, JB, McKenzie, CJ, Svane, S & Canfield, DE 2017, 'Evidence of molybdenum association with particulate organic matter under sulfidic conditions', Geobiology, vol. 15, no. 2, pp. 311-323. https://doi.org/10.1111/gbi.12220

APA

Dahl, T. W., Chappaz, A., Hoek, J. B., McKenzie, C. J., Svane, S., & Canfield, D. E. (2017). Evidence of molybdenum association with particulate organic matter under sulfidic conditions. Geobiology, 15(2), 311-323. https://doi.org/10.1111/gbi.12220

Vancouver

Dahl TW, Chappaz A, Hoek JB, McKenzie CJ, Svane S, Canfield DE. Evidence of molybdenum association with particulate organic matter under sulfidic conditions. Geobiology. 2017;15(2):311-323. https://doi.org/10.1111/gbi.12220

Author

Dahl, T. W. ; Chappaz, Anthony ; Hoek, J.B. ; McKenzie, Christine J. ; Svane, S. ; Canfield, D. E. / Evidence of molybdenum association with particulate organic matter under sulfidic conditions. In: Geobiology. 2017 ; Vol. 15, No. 2. pp. 311-323.

Bibtex

@article{896ef6df5e56465ba7bcdda2e0858fdd,
title = "Evidence of molybdenum association with particulate organic matter under sulfidic conditions",
abstract = "The geochemical behavior of molybdenum (Mo) in the oceans is closely linked to the presence of sulfide species in anoxic environments, where Fe availability may play a key role in the Mo scavenging. Here, we show that Mo(VI) is reduced in the presence of particulate organic matter (represented by sulfate-reducing bacteria). Molybdenum was immobilized at the surface of both living cells and dead/lysed cells, but not in cell-free control experiments. Experiments were carried out at four different Mo concentrations (0.1 to 2 mm) to yield cell-associated Mo precipitates with little or no Fe, consisting of mainly Mo(IV)-sulfide compounds with molecular structures similar to Mo enzymes and to those found in natural euxinic sediments. Therefore, we propose that Mo removal in natural sulfidic waters can proceed via a non-Fe-assisted pathway that requires particulate organic matter (dead or living sulfate-reducing bacteria). This pathway has implications for global marine Mo cycling and the current use of Mo-based proxies for paleo-environmental investigations.",
author = "Dahl, {T. W.} and Anthony Chappaz and J.B. Hoek and McKenzie, {Christine J.} and S. Svane and Canfield, {D. E.}",
year = "2017",
doi = "10.1111/gbi.12220",
language = "English",
volume = "15",
pages = "311--323",
journal = "Geobiology",
issn = "1472-4677",
publisher = "Wiley-Blackwell",
number = "2",

}

RIS

TY - JOUR

T1 - Evidence of molybdenum association with particulate organic matter under sulfidic conditions

AU - Dahl, T. W.

AU - Chappaz, Anthony

AU - Hoek, J.B.

AU - McKenzie, Christine J.

AU - Svane, S.

AU - Canfield, D. E.

PY - 2017

Y1 - 2017

N2 - The geochemical behavior of molybdenum (Mo) in the oceans is closely linked to the presence of sulfide species in anoxic environments, where Fe availability may play a key role in the Mo scavenging. Here, we show that Mo(VI) is reduced in the presence of particulate organic matter (represented by sulfate-reducing bacteria). Molybdenum was immobilized at the surface of both living cells and dead/lysed cells, but not in cell-free control experiments. Experiments were carried out at four different Mo concentrations (0.1 to 2 mm) to yield cell-associated Mo precipitates with little or no Fe, consisting of mainly Mo(IV)-sulfide compounds with molecular structures similar to Mo enzymes and to those found in natural euxinic sediments. Therefore, we propose that Mo removal in natural sulfidic waters can proceed via a non-Fe-assisted pathway that requires particulate organic matter (dead or living sulfate-reducing bacteria). This pathway has implications for global marine Mo cycling and the current use of Mo-based proxies for paleo-environmental investigations.

AB - The geochemical behavior of molybdenum (Mo) in the oceans is closely linked to the presence of sulfide species in anoxic environments, where Fe availability may play a key role in the Mo scavenging. Here, we show that Mo(VI) is reduced in the presence of particulate organic matter (represented by sulfate-reducing bacteria). Molybdenum was immobilized at the surface of both living cells and dead/lysed cells, but not in cell-free control experiments. Experiments were carried out at four different Mo concentrations (0.1 to 2 mm) to yield cell-associated Mo precipitates with little or no Fe, consisting of mainly Mo(IV)-sulfide compounds with molecular structures similar to Mo enzymes and to those found in natural euxinic sediments. Therefore, we propose that Mo removal in natural sulfidic waters can proceed via a non-Fe-assisted pathway that requires particulate organic matter (dead or living sulfate-reducing bacteria). This pathway has implications for global marine Mo cycling and the current use of Mo-based proxies for paleo-environmental investigations.

U2 - 10.1111/gbi.12220

DO - 10.1111/gbi.12220

M3 - Journal article

C2 - 27997756

AN - SCOPUS:85007382095

VL - 15

SP - 311

EP - 323

JO - Geobiology

JF - Geobiology

SN - 1472-4677

IS - 2

ER -

ID: 177048698