Abstract

SYNTHESIS OF 2-HYDROXY-1-NAPHTHALDEHYDE-P-HYDROXYBENZOICHYDRAZONE (HNHBH) AND ITS APPLICATIONS IN DIRECT AND DERIVATIVE SPECTRO PHOTOMETRIC DETERMINATION OF PALLADIUM (II)

P. Govinda Chowdary and V. Saleem Basha*

Abstract

A new chromophore, 2-hydroxy-1-naphthaldehyde-p-hydroxybenzoichydrazone (HNHBH) has been synthesized, characterized and its analytical applications for the determination of palladium (II) are investigated. Palladium (II) reacts with the organic reagent in aqueous dimethyl formamide (DMF) in wide pH range forming greenish yellow coloured 1:1 (M: L) soluble complex with max at 430 nm. The colour formation was instantaneous and was stable more than 48 hours in a neutral micellar medium (Triton X-100). Beer’s law obeys in the range 0.212-7.660 μg mL-1 of Pd(II). The molar absorptivity, Sandell’s sensitivity, detection limit, determination limit and relative standard deviation are calculated as 2.48 x 104 L mol- 1cm-1, 0.0057 μg cm-2, 0.042 μg mL-1, 0.127 μg mL-1 and 1.31 % respectively. The second and third order derivative spectrophotometric methods are also developed for the determination of palladium (II) which showed greater sensitivity and selectivity. Proposed direct and derivative methods are applied for the determination of palladium in activated charcoal, soil samples, industrial effluents, alloys and in soil, river waters.

Keywords: Palladium, Spectrophotomtry, HNHBH, activated charcoal, alloys, soil samples and industrial effluents.