PMID: 15224750Jul 1, 2004Paper

Free radical destruction of N-nitrosodimethylamine in water

Environmental Science & Technology
Stephen P MezykDavid M Bartels

Abstract

Absolute rate constants for the reactions of the hydroxyl radical, hydrated electron, and hydrogen atom with N-nitrosodimethylamine (NDMA) in water at room temperature have been determined using electron pulse radiolysis and transient absorption spectroscopy (*OH and e- aq) and EPR free induction decay attenuation (*H) measurements. Specific values of (4.30 +/- 0.12) x 10(8), (1.41 +/- 0.02) x 10(10), and (2.01 +/- 0.03) x 10(8) M(-1) s(-1) were measured, respectively. DMPO spin-trapping experiments demonstrated that the hydroxyl radical reaction with NDMA occurs by hydrogen atom abstraction from a methyl group, and the rate constant for the subsequent reaction of this radical transient with dissolved oxygen was measured as (5.3 +/- 0.6) x 10(6) M(-1) s(-1). This relatively slow rate constant implies that regeneration of the parent nitrosoamine from the oxidized transient could occur in natural waters containing dissolved organic compounds. The reaction of the hydrated electron with NDMA was to form a transient adduct anion, which could subsequently transfer this excess electron to regenerate the parent chemical. Such regeneration reactions would significantly reduce the effectiveness of any applied advanced oxidation technolog...Continue Reading

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Citations

May 10, 2007·The Journal of Physical Chemistry. B·Sergei V Lymar, Vladimir Shafirovich
Mar 1, 2011·Journal of Hazardous Materials·Jacek Nawrocki, Przemysław Andrzejewski
Sep 23, 2014·Water Research·Erica J MartiEric R V Dickenson
Mar 3, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Daisuke Minakata, Erica Coscarelli
Jun 26, 2012·Chemical Society Reviews·Claus J NielsenChristian Weller
Mar 28, 2020·Environmental Technology·Masoomeh MehrniaDilek Şolpan
Sep 15, 2009·Environmental Science & Technology·Daisuke MinakataJohn Crittenden
Nov 21, 2009·Environmental Science & Technology·Brian P ChaplinJames Farrell
Mar 2, 2018·Environmental Science & Technology·Xiangchen HuoTimothy J Strathmann
Mar 11, 2006·The Journal of Physical Chemistry. a·M I GuzmanM R Hoffmann

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