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Eco-friendly method for the estimation of cobalt (II) in real samples using 1-(2-Thiazolylazo)-2-naphthol

Muhammad Bachal Korai, Ghulam Abbas Shar, Gul Afshan Soomro, Nisar Abbas Shar, Rafique Abbas Shar

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J. Bio. Env. Sci.15(1), 12-21, July 2019


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An easy and quick spectrophotometric method is developed for the investigation of cobalt at trace level using 1-(2-Thiazolylazo)-2-naphthol (TAN) in presence of surfactant cetyltrimethylammonium bromide (CTAB) aqueous micellar solution. The cobalt forms bis [1-(2-Thiazolylazo)-2-naphthol] cobalt complex reacting with 1-(2-Thiazolylazo)-2-naphthol. Proposed method is of great importance because use of micellar system instead of solvent extraction steps that were toxic, expensive and time consuming. The method shows improved sensitivity, selectivity and molar absorption. The coefficient of molar absorption and Sandell’s sensitivity was found to be ε 1.89 × 104L mol-1 cm-1 and 3.1ngcm-2 at λmax 572.7nm. Graph of Linear concentration calibration was obtained in the range 0.02-9.0μgmL-1; stoichiometric metal ligand ratio was found 1:2 for the complex Co-[TAN]2 formation. The proposed method was applied for the investigation of cobalt from different alloys, biological, environmental and pharmaceutical samples.


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Eco-friendly method for the estimation of cobalt (II) in real samples using 1-(2-Thiazolylazo)-2-naphthol

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