Document Detail


Characterization of dissolved organic matter fractions and its relationship with the disinfection by-product formation.
MedLine Citation:
PMID:  19402400     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Dissolved organic matter (DOM) has been identified as precursor for disinfection by-products (DBPs) formation during chlorination. Recently, it has been demonstrated that the characteristics of DOM influence the DBPs formation mechanism. A study was, therefore, initiated to investigate the effects of DOM fractions on DBPs formation mechanism. In the chlorination process, organic acids are dominant precursors of total thihalomethanes (TTHM) because of the v(c-o) and unsaturated structures. Furthermore, the TTHM formation of organic acids was affected by pH more greatly. Based on the fluorescence spectroscopy analysis, DOM fractions contained several fluorescence substances. During chlorination, humic acid-like substances were found to exhibit high chlorine reactivity and hydrophobic organics decomposed to smaller molecules faster than hydrophilic organics even at lower chlorine dosages. Unlike hydrophobic fractions, hydrophilic organics showed no toxicity following chlorination, suggesting that the toxic structures in hydrophilic organics showed high chlorine reactivity during chlorination.
Authors:
Hua Zhang; Jiuhui Qu; Huijuan Liu; Dongbin Wei
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of environmental sciences (China)     Volume:  21     ISSN:  1001-0742     ISO Abbreviation:  J Environ Sci (China)     Publication Date:  2009  
Date Detail:
Created Date:  2009-04-30     Completed Date:  2009-06-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100967627     Medline TA:  J Environ Sci (China)     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  54-61     Citation Subset:  IM    
Affiliation:
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. zhanghua7977@163.com
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MeSH Terms
Descriptor/Qualifier:
Acetonitriles / chemistry
Biological Assay
Chlorine / chemistry
Disinfectants / chemistry*,  toxicity
Halogenation
Hydrogen-Ion Concentration
Kinetics
Organic Chemicals / chemistry*
Photobacterium / drug effects
Solubility
Spectrometry, Fluorescence
Spectroscopy, Fourier Transform Infrared
Trihalomethanes / chemistry
Water Purification
Chemical
Reg. No./Substance:
0/Acetonitriles; 0/Disinfectants; 0/Organic Chemicals; 0/Trihalomethanes; 545-06-2/trichloroacetonitrile; 7782-50-5/Chlorine

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


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