Spectrophotometric study of the effect of cationic micelles on the reaction between gallein and TH(IV)
The acid dissociation equilibria of gallein (pyrogallolphthalein, gall), as a xanthene dye, in the presence of various surfactants--cationic, anionic, nonionic, are discussed. The coexistence of a cationic surfactant, such as hexadecyltrimethylammonium chloride (HTAC) slightly enhanced the acid dissociation, and led to a chromogenic reaction between metal ions and gall in weakly acidic media. The ternary complex between gall and Th(IV), in weakly acidic media and in the presence of N-hexadecylpyridinium chloride(HPC), was very stable with definitive spectra. However, the complex was easily decomposed in proportion to the concentration of citrate ion. Therefore, simple and rapid spectrophotometric methods for the determination of Th(IV) and citrate ion were respectively established, by using the gall-Th(IV)-HPC ternary complex in the cationic surfactant micelle. Beer's law was obeyed over the range 0 to 90..mu..g of Th(IV) and 12 to 35..mu..g of citrate ion, in a final volume of 10 ml. The Sandell sensitivities were estimated to be 0.0013 ..mu..g/cm/sup 2/ Th(IV) and 0.0005 ..mu..g/cm/sup 2/ citrate ion at 600 nm. The analytical procedures were simple and did not require any organic solvent extraction.
- Research Organization:
- Osaka Univ. of Pharmaceutical Sciences, Japan
- OSTI ID:
- 5648264
- Journal Information:
- Anal. Lett.; (United States), Journal Name: Anal. Lett.; (United States) Vol. 20:10; ISSN ANALB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
400702 -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ABSORPTION SPECTROSCOPY
ACTINIDES
ANIONS
CATIONS
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COMPLEXES
DATA
ELEMENTS
EXPERIMENTAL DATA
GALLIUM COMPLEXES
INFORMATION
IONS
METALS
MICELLAR SYSTEMS
NUMERICAL DATA
PH VALUE
QUANTITATIVE CHEMICAL ANALYSIS
SPECTROSCOPY
SURFACTANTS
THORIUM