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ID 19966
Eprint ID
19966
FullText URL
Author
Motomizu, Shoji
Abstract
Ion association properties of four kinds of anionic divalent azo dyes were investigated in an aqueous solution containing hydrophobic quaternary ammonium ions. The dyes used in this study possessed a hydroxy and a sulfonate group, which existed as a divalent anion in an alkaline solution. In capillary electrophoresis measurements, the apparent electrophoretic mobility of the dyes decreased along with an increase in the concentration of quaternary ammonium ion (Q(+)) in a migrating solution. Ion association constants of the dyes with Q(+), K(ass), were determined by a simulation method of the mobility change using a non-linear least square method, when 1:1 ion associates formed. The increase in log K(ass) was about 0.07 log unit per one methylene group; that is, the hydrophobicity of a pairing ion played an important role in the ion association reaction in aqueous solutions, as well as ion association in solvent extraction systems. Nitro groups of the dyes slightly affected the ion association constants, whereas the position of the sulfonate group in the azo dyes showed a significant change in ion association constants.
Keywords
Ion association
aqueous solution
capillary electrophoresis
azo dye anion
quaternary ammonium ion
Published Date
1997-02-10
Publication Title
Analytical Sciences
Volume
volume13
Issue
issue1
Publisher
日本分析化学会
Publisher Alternative
Japan Society for Analytical Chemistry
Start Page
11
End Page
18
ISSN
0910-6340
NCID
AA10500785
Content Type
Journal Article
Official Url
http://www.journalarchive.jst.go.jp/english/jnlabstract_en.php?cdjournal=analsci1985&cdvol=13&noissue=1&startpage=11
language
英語
Copyright Holders
日本分析化学会
File Version
publisher
Refereed
True
DOI