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Open Access Green as soon as Postprint is submitted to ZB.
Controls on the transport and carbon isotopic composition of dissolved organic carbon in a shallow groundwater system, Central Ontario, Canada.
Chem. Geol. 87, 39-57 (1991)
The sources, fluxes and sinks of dissolved organic carbon (DOC) in a groundwater recharge environment and along a well defined flowpath were investigated in a shallow unconfined aquifer system in Central Ontario, Canada. The initial recharge flux of DOC in the upper vadose zone is estimated to be 49 kg ha-1 yr-1, however, biochemical recycling and retention processes deeper in the vadose zone result in a net DOC flux of about 9.8 kg ha-1 yr-1 to the groundwater. Within the aquifer sequential redox processes observed along the flowpath (OZ consumption, SO4 2- reduction, fermentation) further consume or produce DOC. Characterization of the DOC suggest a predominance of high molecular weight (HMW) aquatic fulvic acids and intermediate molecular weight compounds. Radiocarbon analyses of HMW and low molecular weight DOC fractions in the groundwater indicate: (1) DOC fractions recharging the groundwater system are derived from organic carbon sources in the upper soil zone; (2) 14C reductions in DOC observed along the groundwater flowpath are a combined result of redox processes (DOC oxidation, production) and the gradual input of bomb 14C; and (3) DOC oxidation in the groundwater does not significantly impact the inorganic geochemistry or carbon isotopic composition of the dissolved inorganic carbon pool.
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Publication type
Article: Journal article
Document type
Scientific Article
ISSN (print) / ISBN
0009-2541
e-ISSN
1872-6836
Journal
Chemical Geology
Quellenangaben
Volume: 87,
Issue: 1,
Pages: 39-57
Publisher
Elsevier
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institut für Hydrologie