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  1. University of Mandalay
  2. Department of Chemistry

Thermodynamic studies of dodecylpyridinium ion binding to fulvic acid

http://hdl.handle.net/20.500.12678/0000001012
http://hdl.handle.net/20.500.12678/0000001012
014b076a-d43c-4842-9077-c60c2747690e
8a8d37a3-970e-4c5e-ba7e-077f810d3b05
Publication type
Journal article
Upload type
Publication
Title
Title Thermodynamic studies of dodecylpyridinium ion binding to fulvic acid
Language en
Publication date 2006
Authors
Min Min Yee
Miyajima, Tohru
Takisawa, Noboru
Description
The binding of dodecylpyridinium ions (C12Py+) with Aso fulvic acid (AFA) has been studied from the thermodynamic point of view by using
potentiometric titration method with surfactant-ion-selective membrane electrodes in aqueous solution of pH 9.18 and at the ionic strength of
0.03 mol dm−3. The cooperative binding of C12Py+ with AFA is the endothermic process driven by the positive entropy resulting possibly from
the dehydration of hydrophobically hydrated water molecules around the hydrocarbon chains of the bound C12Py+ ions. The binding is obviously
pH dependent and is most pronounced at pH 9.18. Different binding modes are observed at two pH regions, i.e., cooperative binding at pH > 7
and non-cooperative binding at pH < 7. The effect of ionic strength is also important in binding phenomenon. As the ionic strength decreases, the
C12Py+ binding with AFA is enhanced, probably due to the lowering of screening effect of counterions. The sensitivity of binding to ionic strength
is larger at high pH than that at low pH in AFA system.
Keywords
Aso fulvic acid
Identifier https://umoar.mu.edu.mm/handle/123456789/311
Journal articles
1–3
Colloids and Surfaces A: Physicochemical and Engineering Aspects
287
Conference papaers
Books/reports/chapters
Thesis/dissertations
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