title: Reduction of chloroform formation potential of humic acid by sonolysis and ultraviolet irradiation.
abstract: This study is concerned with the changes of chloroform formation potential during the reaction of humic acid (HA) and sodium hypochlorite caused by different oxidative pretreatments: ultraviolet (UV) irradiation, ultrasonic (US) irradiation or combined UV-US irradiations. The UV and US decomposition of a reagent HA in water was investigated. The characterization of the oxidized HA sample by UV absorptiometry, synchronous fluorescence spectroscopy and size exclusion chromatography points a synergetic effect of the combined process. The values of the chlorine demand and chloroform formation potential were conventionally determined after a 96 h reaction at neutral pH. It was found that all applied processes decreased the concentration of chloroform but the highest decrease was observed for the UV-US treatment.
authors.affiliation: Laboratoire de Chimie Moléculaire et Environnement, Ecole Supérieure d'Ingénieurs de Chambéry, Université de Savoie-73376, Le Bourget du Lac, France. emmanuel.naffrechoux@univ-savoie.fr
authors.forename: E
authors.initials: E
authors.lastname: Naffrechoux
authors.forename: E
authors.initials: E
authors.lastname: Combet
authors.forename: B
authors.initials: B
authors.lastname: Fanget
authors.forename: C
authors.initials: C
authors.lastname: Petrier
mesh_terms: D002725:Chloroform / Q000032:analysis*; D006812:Humic Substances / Q000737:chemistry*; D010084:Oxidation-Reduction; D012997:Solvents / Q000737:chemistry*; D014465:Ultrasonics; D014466:Ultraviolet Rays; D018508:Water Purification / Q000379:methods*
chemical_list: D006812:Humic Substances; D012997:Solvents; D002725:Chloroform