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Title: Assessing chemical constituents in reservoir tailwaters
Authors: Nix, J. (Joe)
Ouachita Baptist University
Louisiana State University (Baton Rouge, La.)
Water Quality Research Program (U.S.)
Ashby, Steven L.
Hall, Amy S.
Faulkner, Stephen P.
Gambrell, Robert P.
Smith, Brenda A.
Hintze, Paul E.
Keywords: Analytical methods
Water quality
Water chemistry
Reservoir releases
Tail waters
Nimrod Lake
Nimrod Dam
Publisher: Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Technical Report
Abstract: Techniques for assessing the fate of selected chemical constituents in reservoir tailwaters were evaluated using a review of analytical methods and laboratory studies to determine applicable field methods and field studies to evaluate selected methods. An annotated bibliography of analytical methods is included. Analytical methods for the measurements of reduced and oxidized iron and manganese were the primary methods evaluated. Colorimetric methods using ferrozine were determined the most suitable for measurements of reduced iron. Colorimetric measurements of manganese using formaldoxime were considered the most suitable for measurements of reduced manganese. Filtration, a commonly used method to differentiate reduced and oxidized forms of iron and manganese in field applications, was considered inadequate, especially for reduced iron determinations. Field sampling recommendations included the use of colorimetric methods for real-time measurements of reduced iron and manganese and sample collection and preservation for laboratory analyses for measurements of total iron and manganese. Concentrations of oxidized iron and manganese can then be calculated by difference. A case study conducted at Nimrod Lake, a flood control reservoir in central Arkansas, using recommended colorimetic techniques supported laboratory investigations. Recommended analytical methods for measuring reduced iron and manganese will improve application and interpretation of the Tailwater Quality Model for describing water quality processes in reservoir releases.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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