Use of 1,5-bis(di-2-pyridylmethylene)thiocarbonohydrazide as an extracting reagent for the determination of some transition metal ions by atomic absorption spectrometry

Abstract

1,5-Bis(di-2-pyridylmethylene)thiocarbonohydrazide, DPTH, has been studied as an extracting reagent for Co^II, Ni^II, Cu^II, Fe^II, Zn^II and Cd^II. An atomic absorption spectrometric method for the determination of trace amounts of cobalt in solution with DPTH is described. This compound reacts with cobalt in an acidic medium to produce a complex that can be extracted into chloroform. The sensitivity of the method is 0.4 µg ml^–1. The method has been applied satisfactorily to the determination of cobalt in several steel samples.