SRCosmos:

Order of appearence	Full citation	SRCosmos Link
1	www.epa.gov/iris/subst/index.html (10.09.2005)
2	Wunsch, K-H. Miethchen R., Ehlers D. (1979), Organische Chemie Grundkurs, PWN, Warsaw.
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4	Mitch WA, Sedlak DL, (2003), A N-nitrosodimethylamine (NDMA) precursor analysis for chlorination of water and wastewater, Water Research, 37, 3733-3741.
5	Choi J, Valentine RL, (2002), Formation of N-nitrosodimethylamine (NDMA) from reaction of monochloroamine: a new disinfection by-product, Water Research, 36, 817-824.
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7	Andrzejewski P, Czerwiρska M, Kasprzyk-Hordern B, Nawrocki J, (2004), Analysis and formation of NDMA (N-nitrosodimetyloamine) – the new chlorination byproduct, In: Proceedings of XVIIIth National, VIth International Scientific And Technical Conference „Water Supply And Water Quality” Poznaρ, September 6-8, 2004
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9	www.chemfinder.com (10.09.2005)

Keywords	Nitrosamines, water disinfection, chlorination, NMEA, N-nitrosomethylethylamine, NDEA, N-nitrosodimethylamine, disinfection by-products, DBPs
Abstract	Nitrosamines, mainly N-nitrosodimethylamine (NDMA), N-nitrosomethylethylamine (NMEA) and N-nitrosodiethylamine (NDEA) are highly mutagenic compounds that are suspected of carcinogenic activity to the human body. The aim of the paper is the evaluation of the possibility of N-nitrosomethylethylamine and N-nitrosodiethylamine formation as a result of the reaction of methylethylamine (MEA) or diethylamine (DEA) respectively with chlorine in the presence of ammonia ions. The optimal conditions of NMEA and NDEA formation were identified as a result of an experiment carried out using different molar ratios of the substrates of reaction. As the primary aim of the research was the evaluation of the possibility of NMEA and NDEA formation as a result of the reaction of methylethylamine or diethylamine respectively with chlorine in the presence of ammonia ions, a successful result obtained after GC-LRMS analysis was fundamental to the further research. Analytes from postreaction mixtures were concentrated, according to the modified procedure proposed by Mitch et al., by means of liquid/liquid extraction with the usage of methylene chloride. The N-nitrosomethylethylamine and N-nitrosodiethylamine were found in the analyzed extracts of post-reaction mixtures. Apart from NMEA and NDEA identification, the verification of other products with the usage of mass spectra library was also undertaken. The results indicated that the changes in the relative ratio of the substrates influence the concentration of NMEA and NDEA. The obtained results revealed that NMEA and NDEA are only two of the many products of the reaction taking place in the aqueous solution, which contained ethylethylamine or diethylamine and ammonia ions, and was disinfected with chlorine. The other identified products are: ethyl(methyl)formamide and 3-ethyl(methyl)aminopropanenitrile. Therefore N-nitrosomethylethylamine and N-nitrosodiethylamine can be treated as new disinfection by-products similar to THMs, HAAs, MX or NDMA.
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Name	Affiliation	Home page	e-mail	Total pubs
Andrzejewski P	dam Mickiewicz University, Faculty of Chemistry, Department of Water Treatment Technology, ul. Drzymaly 24, 60-613 Poznan, Poland		pandrz@amu.edu.pl	5
Kasprzyk-Hordern B				4
Nawrocki J				5