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Carbon Contents and Sources in Ground Waters of the Central Platte Region in Nebraska¹

ABSTRACT

Fifty-one ground water samples collected in a losing reach of the Platte River were analyzed for alkalinity, dissolved oxygen (DO), dissolved organic carbon (DOC), and for the ¹³C values of DOC. Ranges in concentrations were 24.8 to 109 mg/liter, 0.0 to 5.5 mg/liter, 0.5 to 4.8 mg/liter, and –15.6 to –25.4 0/00 for inorganic carbon, DO, DOC, and ¹³C, respectively. The concentrations of these constituents are primarily associated with land use and well depth. Carbon isotope fractionation can be useful in determining sources of organic carbon to the ground water.

Key Words: dissolved oxygen • dissolved organic carbon • ¹³C • ground water

¹ Contribution from the Conservation and Survey Div., Inst. of Agric. and Nat. Resour., Univ. of Nebraska, Lincoln. This research was funded through grants from the Central Platte Nat. Resour. District and the Nebraska Water Resour. Center (project A-047-NEB).

² Associate Professor, Assistant Professor, and Graduate Student, respectively.

Received for publication December 15, 1977.

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