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Characterization and Origin of Dissolved Organic Carbon in Yegua Ground Water in Brazos County, Texas
Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA.
Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA.
Environmental and Energy Sciences Division, Battelle Pacific Northwest Laboratory, Richland, WA 99352, USA.
Department of Biological Sciences, University of South Carolina, Columbia, SC 29208, USA.
2005 (engelsk)Inngår i: Groundwater, E-ISSN 1745-6584, Vol. 39, nr 5, s. 760-767Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Abstract Dissolved organic carbon (DOC) concentrations in five shallow (< 20 m) and three deeper wells (27 to 30 m) in the Eocene Yegua Formation (Brazos County in east-central Texas) ranged from 92 to 500 ᅵm. Characterization of high, intermediate, and low molecular weight DOC fractions (HMW > 3000 amu, IMW 1000 to 3000 amu, and LMW 500 to 1000 amu) and combined neutral sugar analyses provide information on organic matter sources in the Yegua aquifers. Combined neutral sugars ranged in concentration from 0.6 to 2.7 ᅵmol/L and comprised 0.8% to 6.7% of DOC in ground water. Glucose was the most abundant neutral sugar, followed by xylose and galactose, arabinose, mannose, rhamnose, and fucose. These combined neutral sugars were more diagenetically altered in shallow, oxic ground water as indicated by high mole % fucose + rhamnose and low neutral sugar yield. The precursors for neutral sugars are most probably angiosperm leaves, which show a similar distribution pattern of neutral sugars. Ground water DOC was depleted in 13C relative to soil-zone organic matter (OM) (-16ᅵ to -19ᅵ). The d13C values of bulk DOC and HMW DOC ranged from -24ᅵ to ᅵ32ᅵ, whereas LMW and IMW DOC ranged from -32ᅵ to -34ᅵ and ᅵ16ᅵ to ᅵ28ᅵ, respectively. This variability in d13C values is probably related to microbial processes and selective preservation of OM. Carbon isotope analyses in bulk and different molecular weight DOC fractions imply a predominantly C3 OM source and a low contribution of soil-zone OM to DOC.

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John Wiley & Sons, 2005. Vol. 39, nr 5, s. 760-767
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URN: urn:nbn:se:liu:diva-151922DOI: 10.1111/j.1745-6584.2001.tb02367.xOAI: oai:DiVA.org:liu-151922DiVA, id: diva2:1254782
Tilgjengelig fra: 2018-10-10 Laget: 2018-10-10 Sist oppdatert: 2018-10-10bibliografisk kontrollert

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