Direct and derivative spectrophotometric determination of zirconium(IV) with 2,4-dihydroxy benzaldehyde isonicotinoyl hydrazone

Abstract

A simple and sensitive spectrophotometric method has been developed for the determination of zirconium(IV) in aqueous medium. The metal ion forms golden yellow coloured, soluble

complex with 2,4-dihydroxy benzaldehyde isonicotinoyl hydrazone (2,4-DHBINH) at <i>p</i>H<i> </i>1.5 with λ_max at 410 nm. Beer's law is obeyed in the range 0.40-4.00 μg ml^-1 of Zr(IV). The molar absorptivity and the Sandell's sensitivity of the method are 1.82×10⁴ lit mol^-l cm^-1 and 0.005 μg cm^-2, respectively. The interference of various ions has been studied. The complex has a 1:2 [Zr(IV):2,4-DHBINH] stoichiometry. A method for the determination of zirconium(IV) by first order derivative spectrophotometry has also been proposed.