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Characteristic constants of 2,2???,4???-trihydroxyazobenzene-5-sulfonic acid, a reagent for spectrophotometric analysis

Analytical Chemistry

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Abstract

The dye 2,2???,4???-trihydroxyazobenzene-5-sulfonic acid, has shown promise as a reagent for the determination of zirconium. As the literature contains very little information about this dye, basic data pertinent to its use as a reagent were determined. The sulfonic acid group and all three of the hydroxy groups show acidic characteristics. Apparent dissociation constants were determined for the three more labile protons and the approximate order of magnitude for the fourth constant was estimated. Absorption spectra for the different ionization species are given. A curve is also included which shows the fraction of dye in the different ionization forms at acidities from 10.35M hydrochloric acid to pH 11.9. A sixth dye species was found in 1.0 to 8.4M potassium hydroxide solutions, but its nature is unknown.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Characteristic constants of 2,2???,4???-trihydroxyazobenzene-5-sulfonic acid, a reagent for spectrophotometric analysis
Series title:
Analytical Chemistry
Volume
32
Issue:
13
Year Published:
1960
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Analytical Chemistry
First page:
1822
Last page:
1827