Date of Award

Spring 1997

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Chemistry & Biochemistry

Program/Concentration

Chemistry

Committee Director

Frank E. Scully, Jr.

Committee Member

John R. Donat

Committee Member

Edward J. Poziomek

Call Number for Print

Special Collections LD4331.C45 Z58

Abstract

Current methods used to determine combined residual chlorine cannot distinguish between inorganic monochloramine (NH2Cl) and organic chloramines. Studies described in this thesis were carried out to develop a novel method of determining the concentration of inorganic monochloramine in aqueous solutions. Based on the observation that the reaction of 3-formyl-1-methylpyridinium chloride (3FMPCl) with NH2Cl produces a solution which is fluorescent, experiments were conducted to characterize the reaction and optimize the experimental conditions. Using the finalized protocol, NH2Cl measurements were made in the presence and absence of organic amines and compared with a commonly used N, N-Diethyl-p-phenylenediamine (DPD) - ferrous ammonium sulfate (FAS) method. Results suggest that the method established by this study provides a relatively quick and precise approach for determining NH2Cl concentrations in aqueous solutions. As an advantage over the DPD-FAS method, this technique is not affected by the presence of comparable concentrations of organic chloramines in sample solutions. Moreover, it is about twice as sensitive. Although the detailed underlying mechanisms of the reaction need further study, this new technique is of great potential significance for monitoring drinking water disinfection and wastewater treatment.

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DOI

10.25777/mpdw-z093

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