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

Reference:

Andrzejewski, P., Kasprzyk-Hordern, B. and Nawrocki, J., 2008. N-nitrosodimethylamine (NDMA) formation during ozonation of dimethylamine-containing waters. Water Research, 42 (4-5), pp. 863-870.

Related documents:

Official URL:

http://dx.doi.org/10.1016/j.watres.2007.08.032

Abstract

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.

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