N-nitrosodimethylamine (NDMA) formation during ozonation of dimethylamine-containing waters.
Ozonation of aqueous solutions of dimethylamine (DMA) leads to the formation of nitrosodimethylamine (NDMA). The yield of reaction is low (below 0.4% in relation to DMA) and increases with increasing pH. Contact time, ozone/DMA ratio and radical scavengers are other variables controlling the yield of reaction. Data from the literature and observed ozonation by-products suggest that nitrosation of DMA might be responsible for nitrosamine generation. NDMA can be recognized as a by-product of ozonation of DMA in water, which is formed in a specific, but reasonable, range of ozone/DMA ratios. The reaction may have potential importance for water treatment technology assuming reasonable micrograms per liter of DMA concentrations in raw waters.
Andrzejewski
Przemysław
P
Department of Water Treatment Technology, Faculty of Chemistry, Adam Mickiewicz University, ul. Drzymały 24, 60-613 Poznań, Poland. pandrz@amu.edu.pl <pandrz@amu.edu.pl>
Kasprzyk-Hordern
Barbara
B
Nawrocki
Jacek
J
D004048:Diethylamines / Q000737:chemistry; D004052:Diethylnitrosamine / Q000737:chemistry; D004123:Dimethylamines / Q000737:chemistry*; D004128:Dimethylnitrosamine / Q000031:analogs & derivatives / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D016877:Oxidants / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
D004048:Diethylamines; D004123:Dimethylamines; D016877:Oxidants; D014874:Water Pollutants, Chemical; C017510:methylethylnitrosamine; D004052:Diethylnitrosamine; D010126:Ozone; C034516:dimethylamine; C034281:diethylamine; D004128:Dimethylnitrosamine