Document Detail


Copper catalysis in chloroform formation during water chlorination.
MedLine Citation:
PMID:  14511709     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The seminal work of Rook initiated a considerable body of research regarding the formation of trihalomethanes (THMs) and other by-products of chlorine-based disinfection. Since that time, a broad spectrum of compounds has been identified as precursors to THM formation. More recently, it has been demonstrated that the presence of copper in solution enhances THM formation. Copper is known to catalyze a number of reactions that are similar to the conventional haloform reaction. A study was therefore initiated to investigate the specific role played by copper in the formation of chloroform during chlorination of water supplies. Aqueous solutions containing a number of known THM precursors were chlorinated in the presence and absence of copper, and subjected to time-course monitoring of chloroform concentration. The results of experiments with humic acid demonstrated an apparent catalytic effect on the part of copper in chloroform formation. To examine the role of copper in greater detail, a series of experiments involving aqueous solutions of pure compounds of humic substance structural units was conducted. Of the pure compounds investigated as THM precursors, only citric acid demonstrated enhanced chloroform formation in the presence of copper. A detailed matrix of experiments conducted with citric acid as a precursor demonstrated that copper, at environmentally relevant concentrations, can have a profound effect on chloroform formation. Based on previously published information regarding the mechanism of chloroform formation from citric acid and the results of these experiments, it is hypothesized that copper promotes chloroform formation from chlorination of citric acid through catalysis of oxidative decarboxylation, and the subsequent chlorination of beta-ketoglutaric acid.
Authors:
Ernest R Blatchley; Dimitris Margetas; Ravikrishna Duggirala
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Water research     Volume:  37     ISSN:  0043-1354     ISO Abbreviation:  Water Res.     Publication Date:  2003 Nov 
Date Detail:
Created Date:  2003-09-26     Completed Date:  2004-03-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0105072     Medline TA:  Water Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  4385-94     Citation Subset:  IM    
Affiliation:
School of Civil Engineering, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907-1284, USA. blatch@ecn.purdue.edu
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MeSH Terms
Descriptor/Qualifier:
Catalysis
Chloroform / chemistry*
Citric Acid / chemistry
Copper / chemistry*
Solvents / chemistry*
Trihalomethanes / analysis,  chemistry*
Water Pollutants, Chemical / analysis
Water Purification / methods*
Chemical
Reg. No./Substance:
0/Solvents; 0/Trihalomethanes; 0/Water Pollutants, Chemical; 67-66-3/Chloroform; 7440-50-8/Copper; 77-92-9/Citric Acid

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


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