Document Detail

Humic acid-cetyltrimethylammonium bromide interaction: a fluorimetric study.
MedLine Citation:
PMID:  18785614     Owner:  NLM     Status:  MEDLINE    
Synchronous and excitation emission matrix fluorescence (EEMF) characteristics of humic acid-surfactant interaction have been studied. The variation of synchronous and EEMF spectral maxima and intensities with humic acid (HA)-cetyltrimethylammonium bromide (CTAB) composition sensitively reflects the extent of flocculation of HA. It was found that the concentration range for co-precipitation of HA-CTAB was similar for all concentrations (60 p.p.m., 80 p.p.m. and 100 p.p.m.) of humic acid studied. In the concentration range 60-150 p.p.m. of humic acid, the EEMF maximum is found at 460/540 nm, indicating the presence of ligneous materials. Fluorescence intensity measurement at this contour excitation/emission wavelength (460/540 nm) is suggested as a convenient and a sensitive method for studying the physical state of humic acid in the presence of cationic surfactants. No significant interaction of HA with sodium dodecylsulphate (SDS) and TX-100 was found.
Deepa Subbiah; Ashok Kumar Mishra
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Luminescence : the journal of biological and chemical luminescence     Volume:  24     ISSN:  1522-7243     ISO Abbreviation:  Luminescence     Publication Date:    2009 Mar-Apr
Date Detail:
Created Date:  2009-04-09     Completed Date:  2009-07-15     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  100889025     Medline TA:  Luminescence     Country:  England    
Other Details:
Languages:  eng     Pagination:  84-9     Citation Subset:  IM    
Department of Chemistry, Indian Institute of Technology, Madras, India.
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MeSH Terms
Cetrimonium Compounds / chemistry*
Chelating Agents / chemistry
Chemical Precipitation
Fluorometry / methods*
Humic Substances*
Sodium Dodecyl Sulfate
Surface-Active Agents / chemistry
Reg. No./Substance:
0/Cetrimonium Compounds; 0/Chelating Agents; 0/Humic Substances; 0/Surface-Active Agents; 151-21-3/Sodium Dodecyl Sulfate; 6899-10-1/cetrimonium; 9002-93-1/Octoxynol

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