Document Detail


Kinetics of chloroform formation from humic and fulvic acid chlorination.
MedLine Citation:
PMID:  16835106     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Chloroform formation from chlorination of aquatic humic and fulvic acid solutions was studied. Second order overall kinetic model was assumed, first order with respect to chlorine and precursor content. Rate constants have been measured, resulting in values that varied significantly with reaction conditions, in the range of 0.177-7.206 [L/ mmol h], mainly for fulvic acid. The activation energy deduced from experiments carried out at different temperatures also increased notably when decreasing pH from 8 to 7. Increases of up to 60% were computed, where highest values were measured for humic acid. It is noteworthy the dependence observed on reaction time: higher activation energy resulted for longest reaction periods. Differences in the range of 40% have been reported. This effect is attributed to the existence of simultaneous reactions, each with different activation energy, competing for trihalomethanes formation.
Authors:
Unai Iriarte-Velasco; Jon I Alvarez-Uriarte; Juan R González-Velasco
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering     Volume:  41     ISSN:  1093-4529     ISO Abbreviation:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Publication Date:  2006  
Date Detail:
Created Date:  2006-07-12     Completed Date:  2006-09-07     Revised Date:  2009-08-14    
Medline Journal Info:
Nlm Unique ID:  9812551     Medline TA:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1495-508     Citation Subset:  IM    
Affiliation:
Department of Chemical Engineering, Faculty of Science and Technology, University of the Basque Country, Bilbao, Spain.
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MeSH Terms
Descriptor/Qualifier:
Benzopyrans / chemistry*
Chlorine Compounds*
Chloroform / analysis*
Disinfection
Humic Substances / analysis*
Kinetics
Models, Chemical*
Water Pollutants, Chemical / analysis*
Water Purification / methods
Chemical
Reg. No./Substance:
0/Benzopyrans; 0/Chlorine Compounds; 0/Humic Substances; 0/Water Pollutants, Chemical; 479-66-3/fulvic acid; 67-66-3/Chloroform

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


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