Document Detail

Impact of simulated solar irradiation on disinfection byproduct precursors.
MedLine Citation:
PMID:  18754480     Owner:  NLM     Status:  MEDLINE    
The Sacramento-San Joaquin Delta is the major drinking water source for 23 million California residents. Consequently, many studies have examined disinfection byproduct (DBP) formation in relation to Delta dissolved organic carbon (DOC) concentration. However, DOC characteristics within the Delta are not the same as those entering downstream water treatment facilities. As water is transferred to Southern California through the California Aqueduct, a 714.5 km-open channel, it is exposed to sunlight, potentially altering DBP precursors. We collected water from three sites within the Delta and one nearthe California Aqueduct, representing different DOC sources, and irradiated them in a solar simulator at a dose equivalent to that received during four days conveyance in the aqueduct. Photolytic changes in DOC were assessed by measuring CO2 and organic acid production, fluorescence, and ultraviolet absorbance over time. Trihalomethane (THM) and haloacetic acid (HAA) formation potentials, as well as the distribution of hydrophobic, transphilic, and hydrophilic acid fractions were determined at exposures equivalent to one and four days. Solar irradiation significantly decreased ultraviolet absorbance and fluorescence intensity, produced organic acids, and increased the hydrophilic fraction of waters. These changes in DOC caused a shift in bromine incorporation among the THM and HAA species. Our results are the first to demonstrate the importance of sunlight in altering DOC with respect to DBP formation.
Alex T Chow; Dina M Leech; Treavor H Boyer; Philip C Singer
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  42     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-08-29     Completed Date:  2008-12-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5586-93     Citation Subset:  IM    
College of Environmental Sciences and Engineering, South China University of Technology, Guangzhou 510641, PR China.
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MeSH Terms
Acetic Acid / chemistry
Carbon / chemistry
Carbon Dioxide / chemistry
Disinfectants / chemistry*,  radiation effects*
Photolysis / radiation effects*
Time Factors
Trihalomethanes / chemistry
Water Purification*
Water Supply / analysis*
Reg. No./Substance:
0/Disinfectants; 0/Sewage; 0/Trihalomethanes; 124-38-9/Carbon Dioxide; 64-19-7/Acetic Acid; 7440-44-0/Carbon

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

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