Date of Award

Spring 1997

Document Type

Thesis

Degree Name

Master of Science in Environmental Science - (M.S.)

Department

Chemical Engineering, Chemistry and Environmental Science

First Advisor

Barbara B. Kebbekus

Second Advisor

Victor Ososkov

Third Advisor

S. Mitra

Abstract

In this study, methods for the determination of chromium (VI) in fresh water at low ppb levels for the use under field conditions were developed. The plan was to devise a simple and inexpensive on-site field method which would be useable by people who are not professional chemists. An investigation was carried out to develop a preconcentration and determination procedure for the analysis of chromium (VI) using anion-exchange membranes and/or resins. The chromium (VI) would be sorbed to the solid support and then treated with 1 ,5-diphenylcarabzide, a specific colorimetric reagent for chromium (VI), which forms a red complex upon reaction. A simple preconcentration procedure, and a portable colorimeter were used to make the method suitable for field use. Sensitivity, selectivity and precision are evaluated to ensure that the method to provides accurate and reliable results in the field.

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