Document Detail


Mechanistic studies of N-nitrosodimethylamine (NDMA) formation in chlorinated drinking water.
MedLine Citation:
PMID:  11993764     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Studies were conducted to investigate the hypothesis that N-nitrosodimethylamine (NDMA) is a potential disinfection by-product specifically produced during chlorination or chloramination. Experiments were conducted using dimethylamine (DMA) as a model precursor. NDMA was formed by the reaction of DMA with free chlorine in the presence of ammonia and also with monochloramine. We proposed a mechanism for NDMA formation in chlorinated or chloraminated water, which does not require nitrite as in N-nitrosation. The critical NDMA formation reactions consist of (i) the formation of monochloramine by combination of free chlorine with ammonia, (ii) the formation of 1,1-dimethylhydrazine (UDMH) intermediate from the reaction of DMA with monochloramine followed by, (iii) the oxidation of UDMH by monochloramine to NDMA, and (iv) the reversible chlorine transfer reaction between free chlorine/monochloramine and DMA which is parallel with (i) and (ii). A kinetic model was also developed to validate the proposed mechanism.
Authors:
Junghoon Choi; Stephen E Duirk; Richard L Valentine
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of environmental monitoring : JEM     Volume:  4     ISSN:  1464-0325     ISO Abbreviation:  J Environ Monit     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-05-07     Completed Date:  2002-10-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100968688     Medline TA:  J Environ Monit     Country:  England    
Other Details:
Languages:  eng     Pagination:  249-52     Citation Subset:  IM    
Affiliation:
Department of Civil and Environmental Engineering, University of Iowa, Iowa City.
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MeSH Terms
Descriptor/Qualifier:
Carcinogens / analysis,  chemistry*
Chlorine / chemistry*
Disinfectants / chemistry*
Environmental Monitoring
Kinetics
Nitrosamines / analysis,  chemistry*
Oxidation-Reduction
Water Purification*
Water Supply*
Chemical
Reg. No./Substance:
0/Carcinogens; 0/Disinfectants; 0/Nitrosamines; 7782-50-5/Chlorine; 86-30-6/N-nitrosodiphenylamine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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