Spectrophotometric and Derivative Spectrophotometric Determination of Iron(III) with 3-Hydroxy-2-Picolinamide

Abstract

3-Hydroxy-2-picolinamide gives a colour reaction with iron(III) which has been developed into a method for spectrophotometric determination of iron(III) in both derivative as well as normal modes. Molar absorptivity and Sandell's sensitivity of the complex at its λ_max (475 nm) have been found to be 2.244 x 10³l mol^–1cm^–1 and 0.0248 μg cm^–2 respectively. Beer's law is followed from 0.2 mM to 0.8 mM of iron(III). Interference due to the presence of a number of cations and anions has been studied and the method successfully applied to determine iron contents of iron formulations and a cement sample.