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Selective determination of cobalt using polyurethane foam and 2-(2-benzothiazolylazo)-2-p-cresol as a spectrophotometric reagent

Authors
Journal
Talanta
0039-9140
Publisher
Elsevier
Publication Date
Volume
43
Issue
10
Identifiers
DOI: 10.1016/0039-9140(96)01931-5
Keywords
  • Cobalt Determination
  • Spectrophotometric Reagent
Disciplines
  • Economics

Abstract

Abstract The present work describes a selective, rapid and economical method for the determination of cobalt using the 2-(2-benzothiazolylazo)- p-cresol (BTAC) as a spectrophotometric reagent associated with a solid extraction on polyurethane foam. The BTAC reacts with Co(II) in the presence of Triton-X100 surfactant forming a green complex with maximum absorption at 615 nm. The reaction is used for cobalt determination within a pH range of 6.50–7.50, with an apparent molar absorptivity of 1.62 × 10 4 L mol −1 cm −1. Beer's Law is obeyed for a concentration of at least 1.60 μg ml −1. A selective procedure is proposed for cobalt determination in the presence of Fe(II), Hg(II), Zn(II) and Cu(II) up to milligram levels using masking agents. Polyurethane foam is used for the preconcentration and separation of cobalt from thiocyanate media and this procedure is applied to its determination in nickel salts and steel alloys.

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