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Solid phase extraction method for the study of black carbon cycling in dissolved organic carbon using radiocarbon


Coppola, Alysha I; Walker, Brett D; Druffel, Ellen R M (2015). Solid phase extraction method for the study of black carbon cycling in dissolved organic carbon using radiocarbon. Marine Chemistry, 177(Part 5):697-705.

Abstract

Radiocarbon analysis is a powerful tool for understanding the cycling of individual components within carbon pools, such as black carbon (BC) in dissolved organic carbon (DOC). Radiocarbon (Δ14C) measurements of BC in DOC provide insight into one source of aged, recalcitrant DOC. We report a modified solid phase extraction (SPE) method to concentrate 43 ± 6% of DOC (SPE-DOC) from seawater. We used the Benzene Polycarboxylic Acid (BPCA) method to isolate BC from SPE-DOC (SPE-BC) for subsequent 14C analysis. We report SPE-BC Δ14C values, SPE-BC concentrations, and the relative BPCA distributions from Milli-Q water process blanks, two riverine reference standards, as well as a coastal and an open ocean surface water sample. The composition of BC is less aromatic in the ocean samples than those in the river standards. We find higher BC Δ14C values in the river standards (+ 148 to − 462‰) than BC in the ocean samples (− 592 to − 712‰), suggesting that BC ages within oceanic DOC. We report that BC is 4.2 ± 1.0% of SPE-DOC in the open ocean surface sample, or 1.4 ± 0.1 μM C. This work provides the methodological basis by which global BC concentrations, compositions (e.g. relative abundances of BPCA marker compounds) and Δ14C values can be assessed.

Abstract

Radiocarbon analysis is a powerful tool for understanding the cycling of individual components within carbon pools, such as black carbon (BC) in dissolved organic carbon (DOC). Radiocarbon (Δ14C) measurements of BC in DOC provide insight into one source of aged, recalcitrant DOC. We report a modified solid phase extraction (SPE) method to concentrate 43 ± 6% of DOC (SPE-DOC) from seawater. We used the Benzene Polycarboxylic Acid (BPCA) method to isolate BC from SPE-DOC (SPE-BC) for subsequent 14C analysis. We report SPE-BC Δ14C values, SPE-BC concentrations, and the relative BPCA distributions from Milli-Q water process blanks, two riverine reference standards, as well as a coastal and an open ocean surface water sample. The composition of BC is less aromatic in the ocean samples than those in the river standards. We find higher BC Δ14C values in the river standards (+ 148 to − 462‰) than BC in the ocean samples (− 592 to − 712‰), suggesting that BC ages within oceanic DOC. We report that BC is 4.2 ± 1.0% of SPE-DOC in the open ocean surface sample, or 1.4 ± 0.1 μM C. This work provides the methodological basis by which global BC concentrations, compositions (e.g. relative abundances of BPCA marker compounds) and Δ14C values can be assessed.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Date:2015
Deposited On:29 Mar 2016 09:24
Last Modified:20 Dec 2017 01:00
Publisher:Elsevier
ISSN:0304-4203
Publisher DOI:https://doi.org/10.1016/j.marchem.2015.10.010
Related URLs:http://www.recherche-portal.ch/ZAD:default_scope:ebi01_prod000015960 (Library Catalogue)

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