Document Detail

Effect of chlorination on Microcystis aeruginosa cell integrity and subsequent microcystin release and degradation.
MedLine Citation:
PMID:  17626450     Owner:  NLM     Status:  MEDLINE    
The proliferation of cyanobacteria in drinking water sources is problematic for water authorities as they can interfere with water treatment processes. Studies have shown that oxidants such as chlorine can enhance the coagulation of cyanobacteria; however, chlorine can potentially lyse cyanobacterial cells, releasing toxic metabolites. Chlorine also has the potential to effectively degrade these toxins. This study evaluated the effect of chlorine on the cell integrity of toxic Microcystis aeruginosa in reservoir water using flow cytometry. In addition, the effect of chlorine on the subsequent release and degradation of microcystin toxins was systematically assessed. Cell lysis occurred at chlorine exposure values between 7 and 29 mg min/L, which is within the range of normal disinfection practices. Intracellular toxin was shown to be released from damaged cells at a rate three times faster than it was degraded by chlorine. The degradation of extracellular microcystin by chlorine was found to be dependent upon the pH, chlorine exposure, and the presence of cyanobacterial cells.
Robert I Daly; Lionel Ho; Justin D Brookes
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  41     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-07-13     Completed Date:  2007-08-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4447-53     Citation Subset:  IM    
CRC for Water Quality and Treatment, Australian Water Quality Centre, SA Water Corporation, PMB 3, Salisbury, SA 5108, Australia.
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MeSH Terms
Cell Membrane / drug effects
Chlorine / chemistry,  pharmacology*
Flow Cytometry
Hydrogen-Ion Concentration
Microcystins / chemistry,  secretion*
Microcystis / drug effects*,  metabolism
South Australia
Water / chemistry
Water Microbiology
Water Purification*
Reg. No./Substance:
0/Microcystins; 77238-39-2/microcystin; 7732-18-5/Water; 7782-50-5/Chlorine

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

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