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Title: A new system for spectrophotometric determination of trace amounts of selenium
Authors: Cherian, Tom
Narayana, B
Keywords: Spectrophotometry
Selenium determination
Phenylhydrazine-p-sulphonic acid
Acetylacetone
Ethylacetoacetate
Issue Date: May-2006
Publisher: CSIR
IPC CodeC01B19/00,G01J3/00
Abstract: A simple and selective spectrophotometric method for the determination of trace amounts of selenium(IV) is described based on the oxidation of phenylhydrazine-p-sulphonic acid and coupling reactions. Selenium(IV) oxidizes phenylhydrazine-p-sulphonic acid into its diazonium salt in an acid medium. The diazonium salt is then coupled with acetylacetone or ethylacetoacetate in an alkaline medium, which gives azo dyes with absorption maximum at 490 or 470 nm, respectively. The method obeys Beer’s law in the concentration range of 0.5-20 μg mL-1 of selenium with phenylhydrazine-p-sulphonic acid-acetylacetone and 1-24 μg mL-1 of selenium with phenylhydrazine-p-sulphonic acid-ethylacetoacetate couples. The molar absorptivity, Sandell’s sensitivity of the systems with phenylhydrazine-p-sulphonic acid-acetylacetone and phenylhydrazine-p-sulphonic acid-ethylacetoacetate couples were found to be 1.02104 Lmol-1cm-1, 7.6910-3 μg cm-2 and 1.18104 L mol-1cm-1, 6.6710-3 μg cm-2, respectively. The developed method has been successfully applied for the determination of selenium in plant material, water and soil samples.
Page(s): 222-225
ISSN: 0975-0991 (Online); 0971-457X (Print)
Source:IJCT Vol.13(3) [May 2006]

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