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Humic acid–cetyltrimethylammonium bromide interaction: a fluorimetric study
Author(s) -
Subbiah Deepa,
Mishra Ashok Kumar
Publication year - 2008
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.1069
Subject(s) - humic acid , chemistry , bromide , pulmonary surfactant , fluorescence , flocculation , cationic polymerization , precipitation , matrix (chemical analysis) , analytical chemistry (journal) , nuclear chemistry , inorganic chemistry , chromatography , organic chemistry , fertilizer , biochemistry , physics , quantum mechanics , meteorology
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. Copyright © 2008 John Wiley & Sons, Ltd.