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ID 19965
Eprint ID
19965
FullText URL
Author
Ohba Yoshitaka
Haruki Hiroko
Wada Eiko
Motomizu, Shoji
Abstract
The ion-association properties of monovalent and divalent naphtholsulfonate ions were investigated with tetrabutylammonium ion (TBA(+)) as a pairing ion in an aqueous solution. The ion-association constants were obtained by analyzing the change in the electrophoretic mobility of naphtholsulfonate ions in the presence of TBA+ by capillary zone electrophoresis; also, the contribution of a hydroxyl group to the ion associability of monovalent and divalent naphtholsulfonate ions, as well as the electrophoretic mobility of the ions, was investigated. The obtained ion-association constants indicate that the positional isomers possessing anionic groups at the β-position of the naphthalene ring are more associable with TBA(+) than those at the α-position, and that the ion associability of the divalent naphtholsulfonates is larger than those of the monovalent ones, except for 1-naphthol-2-sulfonate. The abnormal associability of 1-naphthol-2-sulfonate can be explained by a synergistic increase in the hydrophilicity of the divalent ion. The difference in the ion associability between the monovalent and divalent naphtholsulfonates, 0.16 in log unit on the average, was smaller than that between the naphthalenesulfonate and naphthalenedisulfonate ions, 0.30 log unit on the average. The electrophoretic mobility of the naphtholsulfonate ions obtained in the absence of TBA(+) is compared with each other, and the contribution of the hydroxyl group is discussed on the basis of the hydration behavior of the naphtholsulfonates.
Keywords
Ion association
aqueous solution
naphtholsulfonate
capillary zone electrophoresis
tetrabutylammonium ion
Published Date
1998-04-10
Publication Title
Analytical Sciences
Volume
volume14
Issue
issue2
Publisher
日本分析化学会
Publisher Alternative
Japan Society for Analytical Chemistry
Start Page
311
End Page
315
ISSN
0910-6340
NCID
AA10500785
Content Type
Journal Article
Official Url
http://www.jstage.jst.go.jp/article/analsci/14/2/14_311/_article
language
英語
Copyright Holders
日本分析化学会
File Version
publisher
Refereed
True
DOI