Accession Number : ADA328859

Title :   Assessing Chemical Constituents in Reservoir Tailwaters

Descriptive Note : Final rept.

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s) : Ashby, Steven L. ; Hall, Amy S. ; Faulkner, Stephen P. ; Gambrell, Robert P. ; Smith, Brenda A.

PDF Url : ADA328859

Report Date : AUG 1997

Pagination or Media Count : 55

Abstract : Techniques for assessing the fate of selected chemical constituents in reservoir tailwaters were evaluated using a review or 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. Calorimetric 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.

Descriptors :   *CHEMICAL COMPOSITION, *IRON, *WATER QUALITY, *COLORIMETRY, *MANGANESE, REAL TIME, BIBLIOGRAPHIES, FIELD TESTS, REDUCTION, CASE STUDIES, OXIDATION, SAMPLING, RELEASE, CHEMICAL ANALYSIS, RESERVOIRS, FLOOD CONTROL, COLORIMETRIC ANALYSIS, CALORIMETERS.

Subject Categories : Inorganic Chemistry
      Geology, Geochemistry and Mineralogy
      Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE