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A New Titrimetric Procedure for Determination of Nitrate Utilizing Hypochlorite Oxidation of an Azo Dye¹

Department of Dairy Science, Clemson University, Clemson, South Carolina 29631

ABSTRACT

A titrimetric method was devised for determining concentrations on the azo dye resulting from coupling of diazotized sulfanilamide and N-l Naphthylethylene-diamine. The red color of the azo dye is smoothly converted to a clear yellow by titration with sodium hypochlorite. The experimental procedure and a plausible mechanism are discussed with special reference to a possible in-the-field assay technique. The results obtained by titration agree favorably with spectrophotometrie values, and the entire determination requires less than 2 min. The titrimetric modification affords an alternative analytical procedure which allows for nitrate determination in those situations where spectrophotometry is impractical.

¹ Technical Contribution No. 1092, South Carolina Experiment Station. Published by permission of the Director.