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Spatially resolved capture of hydrogen sulfide from the water column and sedimentary pore waters for abundance and stable isotopic analysis

Fike, D. A. and Houghton, J. L. and Moore, S. E. and Gilhooly, W. P. and Dawson, K. S. and Druschel, G. K. and Amend, J. P. and Orphan, V. J. (2017) Spatially resolved capture of hydrogen sulfide from the water column and sedimentary pore waters for abundance and stable isotopic analysis. Marine Chemistry, 197 . pp. 26-37. ISSN 0304-4203. https://resolver.caltech.edu/CaltechAUTHORS:20171023-152816244

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Abstract

Sulfur cycling is ubiquitous in sedimentary environments, where it plays a major role in mediating carbon remineralization and impacts both local and global redox budgets. Microbial sulfur cycling is dominated by metabolic activity that either produces (e.g., sulfate reduction, disproportionation) or consumes (sulfide oxidation) hydrogen sulfide (H_2S). As such, improved constraints on the production, distribution, and consumption of H_2S in the natural environment will increase our understanding of microbial sulfur cycling. These different microbial sulfur metabolisms are additionally associated with particular stable isotopic fractionations. Coupling measurements of the isotopic composition of the sulfide with its distribution can provide additional information about environmental conditions and microbial ecology. Here we investigate the kinetics of sulfide capture on photographic films as a way to document the spatial distribution of sulfide in complex natural environments as well as for in situ capture of H_2S for subsequent stable isotopic analysis. Laboratory experiments and timed field deployments demonstrate the ability to infer ambient sulfide abundances from the yield of sulfide on the films. This captured sulfide preserves the isotopic composition of the ambient sulfide, offset to slightly lower δ^(34)S values by ~ 1.2 ± 0.5‰ associated with the diffusion of sulfide into the film and subsequent reaction with silver to form Ag_2S precipitates. The resulting data enable the exploration of cm-scale lateral heterogeneity that complement most geochemical profiles using traditional techniques in natural environments. Because these films can easily be deployed over a large spatial area, they are also ideal for real-time assessment of the spatial and temporal dynamics of a site during initial reconnaissance and for integration over long timescales to capture ephemeral processes.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.marchem.2017.10.004DOIArticle
http://www.sciencedirect.com/science/article/pii/S0304420317302359PublisherArticle
ORCID:
AuthorORCID
Fike, D. A.0000-0003-2848-0328
Dawson, K. S.0000-0001-8856-4609
Amend, J. P.0000-0003-4953-7776
Orphan, V. J.0000-0002-5374-6178
Additional Information:© 2017 Elsevier B.V. Received 24 July 2017, Revised 15 October 2017, Accepted 17 October 2017, Available online 21 October 2017.
Subject Keywords:Hydrogen sulfide; Sulfur cycling; Stable isotopes; Sulfur isotopes; Photographic film
Record Number:CaltechAUTHORS:20171023-152816244
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20171023-152816244
Official Citation:D.A. Fike, J.L. Houghton, S.E. Moore, W.P. Gilhooly, K.S. Dawson, G.K. Druschel, J.P. Amend, V.J. Orphan, Spatially resolved capture of hydrogen sulfide from the water column and sedimentary pore waters for abundance and stable isotopic analysis, In Marine Chemistry, Volume 197, 2017, Pages 26-37, ISSN 0304-4203, https://doi.org/10.1016/j.marchem.2017.10.004. (http://www.sciencedirect.com/science/article/pii/S0304420317302359)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82597
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Oct 2017 18:03
Last Modified:03 Oct 2019 19:53

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