Mass-spectrometric evidence for the formation of bromochloramine and N-bromo-N-chloromethylamine in aqueous solution

Abstract

22) Haario, H.; Taavitaainen, V. M. Data-Analysis Toolbox for Use with Matlab, Users Guide, Control CAD, Espoo, Finland, 1991. (23) Gergov, M.; Priha, M.; Talka, E.; Kilttila, 0.; Kangas, A.; Kukkonen, K. Tappi J. 1988, 71 (12), 175-184. (24) Saunamaki, R.; Jokinen, K.; Jarvinen, R.; Savolainen, M. (45) Joshi, B. K.; Hillaby, B. J. Environmental fate and effects of bleached pulp mill effluents; Sijdergren, A., Ed.; SwedishMembrane introduction mass spectrometry (MIMS) is used to confirm the existence of bromochloramine and N-bromo-N-chloromethylamine in aqueous solution, which have been proposed previously from UV-visible spectra. Bromochloramine is detected by mass spectrometry and UV-visible spectroscopy as a product of monochloramine reactions with bromide ion and with hypobromous acid. The reaction of HOBr with NH2Cl is at least 3 orders of magnitude faster than the reaction of Br-with NH2C1 at pH 6.5. UV-visible studies also confirm NHBrCl as a product in the following reactions: NH2Cl + NH2Br, NH2Cl + NHBr,, and NH2Br + HOC1. N-Bromo-Nchloromethylamine is detected by mass spectrometry and UV-visible spectroscopy in the reaction of N-chloromethylamine with hypobromous acid.

Membrane introduction Mass Spectrometry: Trends and applications

“…Quantitative data are provided rapidly and structural information about unknown reaction products can be deduced. Among the experiments reported are studies of aqueous phase reactions used to convert chlorine to chloramines , for example, N-bromo-N-chloromethylamine (Gazda et al, 1993). Note that this chemistry occurs in water, the ideal medium for sampling by MIMS.…”

DBP formation during chloramination

“…Although these results apply to only one condition, they are suggestive of the possible importance of bromochloramine in DBP formation in water sources containing Br − . Several reactions between chlorinated and brominated species produce bromochloramine; by far, the most rapid reaction is that between NH 2 Cl and HOBr 24 …”

Proton affinity of peroxyacetyl nitrate sampled by membrane introduction mass spectrometry

“…Membranes were first used in mass spectrometry for monitoring photosynthetic processes 26 and later the method was adapted to solution analysis, by examination of compounds that permeate through hollow fiber capillary membranes. 27 Since then, this area has grown [28][29][30] and MIMS has also been applied to such important areas such as biological waste water treatment, 31 chemical reaction monitoring, 32,33 bioreactor monitoring [34][35][36][37][38] and especially to the analysis of volatile and semi-volatile organic compounds. 29,[39][40][41] Key to recent developments in MIMS has been the use of flow injection methods of sample handling 42,43 in which the solution is transported over the surface of the membrane, often located in a direct insertion membrane probe in the ion source.…”