Document Detail

Formation of haloacetamides during chlorination of dissolved organic nitrogen aspartic acid.
MedLine Citation:
PMID:  19748738     Owner:  NLM     Status:  MEDLINE    
The stability of haloacetamides (HAcAms) such as dichloroacetamide (DCAcAm) and trichloroacetamide (TCAcAm) was studied under different experimental conditions. The yield of HAcAms during aspartic acid (Asp) chlorination was measured at different molar ratio of chlorine atom to nitrogen atom (Cl/N), pH and dissolved organic carbon (DOC) mainly consisted of humic acid (HA) mixture. Ascorbic acid showed a better capacity to prevent the decay of DCAcAm and TCAcAm than the other two dechlorinating agents, thiosulfate and sodium sulfite. Lower Cl/N favored the DCAcAm formation, implying that breakpoint chlorination might minimize its generation. The pH decrease could lower the concentration of DCAcAm but favored dichloroacetonitrile (DCAN) formation. DCAcAm yield was sensitive to the DOC due to higher chlorine consumption caused by HA mixture. Two possible pathways of DCAcAm formation during Asp chlorination were proposed. Asp was an important precursor of DCAN, DCAcAm and dichloroacetic acid (DCAA), and thus removal of Asp before disinfection may be a method to prevent the formation of DCAcAm, DCAN and DCAA.
Wen-hai Chu; Nai-yun Gao; Yang Deng
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-08-19
Journal Detail:
Title:  Journal of hazardous materials     Volume:  173     ISSN:  1873-3336     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2009-11-27     Completed Date:  2010-02-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  82-6     Citation Subset:  IM    
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, PR China.
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MeSH Terms
Acetamides / chemistry*
Aspartic Acid / chemistry*
Carbon / analysis
Humic Substances / analysis
Hydrogen-Ion Concentration
Indicators and Reagents
Nitrogen Compounds / chemistry*
Water Pollutants, Chemical / analysis*
Water Purification
Reg. No./Substance:
0/Acetamides; 0/Humic Substances; 0/Indicators and Reagents; 0/Nitrogen Compounds; 0/Water Pollutants, Chemical; 56-84-8/Aspartic Acid; 7440-44-0/Carbon

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