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Ionic Equilibria of Chromophoric Reagents in Microemulsions

Content Provider	Springer Nature Link
Author	Mchedlov Petrossyan, N. O. Isaenko, Yu. V. Salamava, N. V. Alekseeva, V. I. Savvina, L. P.
Copyright Year	2003
Abstract	Protolytic equilibria of twenty chromophoric acid–base indicators from different classes, namely, sulfophthaleins, hydroxyxanthenes, azo compounds, and others, were studied in direct microemulsions of benzene–pentanol-1–surfactant–water at volume fractions of the dispersed phase of up to 13%. Cetylpyridinium chloride, sodium dodecylsulfate, and certain nonionic surfactants were used. Apparent acidity constants (pK $_{a}$) of indicators were determined under the conditions of their complete binding by microdroplets (pK $_{a}$ $^{ac}$). The strong differentiating effect of the dispersed phase of microemulsions of different types on the acid–base properties of indicators was revealed. The effect of the ionic strength of the continuous phase (0.025–1.0) on the values of pK $_{a}$ $^{ac}$ was studied. The partition constants of Bromothymol Blue anions between water and negatively charged microdroplets were estimated. Similarities and differences were revealed in the action of microemulsions and micellar solutions of the corresponding surfactants on the state of the studied chromophoric reagents.
Starting Page	1018
Ending Page	1030
Page Count	13
File Format	PDF
ISSN	10619348
Journal	Journal of Analytical Chemistry
Volume Number	58
Issue Number	11
e-ISSN	16083199
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2003-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry

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