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Simultaneous Second Derivative Spectrophotometric Determination of Gold and Cobalt

Author Affiliations

  • 1Department of Chemistry, Sri Krishnadevaraya University, Anantapur–515 003, A.P., INDIA

Res.J.chem.sci., Volume 5, Issue (2), Pages 4-7, February,18 (2015)

Abstract

A simple, sensitive, and selective second order derivative spectrophotometric method has been developed for the simultaneous determination of gold(III) and cobalt(II) using 2-hydroxy-3-methoxy benzaldehyde thiosemicarbazone (HMBATSC) as a chromophoric reagent. The reagent (HMBATSC) reacts with Au(III) and Co(II) at pH 6.0, forming soluble blue and brown species, respectively. The second order derivative spectrum of [Au(III)–HMBATSC] exhibits reasonably sufficient amplitude at 435 nm and zero amplitude at 455 nm, and [Co(II)–HMBATSC] shows maximum amplitude at 455 nm and zero amplitude at 435 nm. This difference in amplitudes was utilized to develop a second order derivative spectrophotometric method for the simultaneous determination of Au(III) and Co(II) in a mixture without solving the simultaneous equations by measuring the second derivative amplitudes at 435 nm and 455 nm, respectively. Further, the Beer’s law was obeyed in the range 0.1178–3.7712 ml-1 of Au(III) and 0.1225–3.7400 µg ml-1 of Co(II). A large number of foreign ions do not interfere in the present method. The method is applied to the simultaneous determination of Au(III) in Rheumartho gold and Co(II) in Vitamin B12samples.

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