title: Formation of trichloronitromethane and dichloroacetonitrile in natural waters: precursor characterization, kinetics and interpretation.
abstract: During the chloramination of natural waters, both chloramines and dissolved organic nitrogen (DON) can serve as nitrogen sources for the formation of trichloronitromethane (TCNM) and dichloroacetonitrile (DCAN). The present study investigated the formation kinetics and precursor characteristics of TCNM and DCAN. (15)N-Isotopic monochloramination of the organic fractions produced both (15)N- and (14)N-DCAN and TCNM. Nitrogenous disinfection byproduct (N-DBP) formation, in which the nitrogen precursor originated from DON ((14)N-DCAN and (14)N-TCNM), followed a second-order reaction kinetics (k=3.2×10(-5) to 9.4×10(-5)μM(-1)h(-1)). The formation of N-DBP where the nitrogen atoms originated from chloramines (e.g. (15)N-DCAN and (15)N-TCNM) correlated linearly with chloramine exposure. The discrepancy in formation kinetics results in that the (14)N-DCAN concentrations were two to ten times higher than (15)N-DCAN in the beginning of the reaction (<12h). Possible rate equations are proposed in this study. The results of a model compound study support the results of the chloramination of natural waters. In addition, 4-hydroxybenzaldehyde, an oxidative product commonly found during chlorination/chloramination of natural organic matters, gave a 10-fold greater yield of DCAN than that produced from tyrosine; 4-hydroxybenzaldehyde is thus an important precursor in DCAN formation by chloramine incorporation during the chloramination of natural waters.
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617 Taiwan.
authors.forename: Yi-Hsueh
authors.initials: YH
authors.lastname: Chuang
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617 Taiwan. Electronic address: htung@ntu.edu.tw.
authors.forename: Hsin-Hsin
authors.initials: HH
authors.lastname: Tung
mesh_terms: D000097:Acetonitriles / Q000032:analysis*; D004203:Disinfection; D004784:Environmental Monitoring; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D007700:Kinetics; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods
chemical_list: D000097:Acetonitriles; D006843:Hydrocarbons, Chlorinated; D014874:Water Pollutants, Chemical; C100187:chloropicrin; C051716:dichloroacetonitrile
keywords: 4-Hydroxybenzaldehyde; Chloramines; Disinfection byproducts; Haloacetonitriles; Trichloronitromethane; Tyrosine