FORMATION CHARACTERISTICS OF CHLORINOUS ODOR FROM CHLORINATION OF NITROGEN CONTAINING COMPOUNDS

Abstract

 Formation characteristics of chlorinous odor of 30 nitrogenous compounds were investtegated. Target itmes were odor inteisity, trichloramine (NCl₃) and total purgeable nitrogen (TPN). Formation of chlorinous odor was observed for all target compounds, and it was found that wide varieties of amines and compounds with NH_2- were precursors of chlorinous odor. The odor intensity of eight compounds were higher than that of ammonia (NH₃). From the results of NCl₃ and TPN, it was found that comounds other than NCl₃ were responsible for the chlorinous odor resulting from the chlorination of these eight compounds. For low molecular alkyl amines, the odor intensities of primary amines were higher than those of secondary and tersiary amines. When NH₃ coexisted with bromide (Br^-) (Br^-/NH₃, 0.075-0.5mol/mol), NCl₃ concentration after NH₃ chlorination decreased with increasing Br^- concentration. In case of the odor intensity, it did not change so much at up to 0.25 mol/mol, but decreased at 0.5 mol/mol. Thus, it was suggested that the compouds other than NCl₃ contributed to chlorinous odor in the presence of Br^-.