N-nitrosodimethylamine (NDMA) formation during ozonation of dimethylamine-containing waters

P Andrzejewski, Barbara Kasprzyk-Hordern, J Nawrocki

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175 Citations (SciVal)


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.
Original languageEnglish
Pages (from-to)863-870
Number of pages8
JournalWater Research
Issue number4-5
Publication statusPublished - 2008


  • chlorine
  • precursors
  • DBPs
  • NDMA
  • drinking-water
  • N-nitrosodimethylamine
  • by-product
  • ozone
  • water treatment
  • waste-water
  • disinfection
  • ozone disinfection
  • aliphatic-amines


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