Chlorination and formation o oganoiodinated compounds: the important role of ammonia

摘要

This study has been undertaken to determine the conditions of formation of organoiodinated compounds responsible for medicinal tastes and odors frequently observed after chlorination of waters containing iodides. It has been shown that iodoformwas formed in the presence of chloramines, in a region where the formation of the most classical chlorinated and brominated THMs is usually unfavored. Reactions would take place between monochloramine, organic matter, and iodides to yield iodoform. These interactions are favored when iodide ions are replaced by iodine. Oxidation by iodine alone in the presence of ammonia and without monochloramine does not explain the yield of the iodinated THMs observed. However, nitrogenated molecules such as amines and amino acids would take part during chlorination in the production of organoiodinated compounds to a small extent.