Spectrofluorimetric determination of zinc with pyrocatechol-1-aldehyde 2-pyridylhydrazone

Abstract

Pyrocatechol-1-aldehyde 2-pyridylhydrazone was synthesised and its ionisation constants spectrophotometrically determined. A procedure was developed for the spectrofluorimetric determination of 12–250 ng ml^–1 of zinc in 50%V/V ethanol-water medium, acetate-buffered to apparent pH 5.5 (λ_ex.= 398 nm, λ_em.= 521 nm), using the above reagent. Interferences were evaluated and the procedure was applied satisfactorily to the determination of zinc in potable tap water.