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Rapid spectrophotometric determination of vanadium(V) with 1-(2′-thiazolylazo)-2-naphthol

Authors
Journal
Microchemical Journal
0026-265X
Publisher
Elsevier
Publication Date
Volume
35
Issue
1
Identifiers
DOI: 10.1016/0026-265x(87)90196-2

Abstract

Abstract The sparingly soluble complex formed between vanadium(V) and 4-(2-thiazolylazo)resorcinol ( 5) requires extraction with chloroform, whereas maximum color development for the complex with 4-(2-pyridylazo)resorcinol ( 4) takes place after 60 min. Heating of reactants is required in the methods with 2-(3,5-dibromo-4-methyl-2-pyridylazo)-5-diethylaminophenol ( 3) and 4-(2,3-dihydroxy-4-pyridylazo)benzene sulfonic acid ( 6), whereas absorbance of the complex with 2-methyl-4-(4-methyl-2-thiazolylazo)resorcinol ( 1) is measured after 30 min. Since 1-(2′-thiazolylazo)-2-naphthol (TAN) has been found to be a sensitive chromogenic reagent ( 2), its reaction with vanadium(V) has been studied.

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