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A highly sensitive and selective third order derivative spectrophotometric method is proposed for the simultaneous determination of Vanadium and palladium. V(V) and Pd(II) react with the Chromogenic reagent 2-hydroxy-1-naphthaldehyde-p-hydroxybenzoichydrazone (HNHBH) at pH 4 to form deep yellow and greenish yellow coloured solutions with max at 430 nm. Both the metal ions were simultaneously determined by measuring the third derivative amplitudes at 465.5 nm and 482.5 nm (zero cross method) against the reagent blank and plotting against the amount of the corresponding metal ion. Beer's law was obeyed in the range 0.050 - 1.935 µg mL -1 and 0.022-2.021 µg mL -1 for V(V) and Pd(II) respectively. No interference from associated anions and cations was observed. The method was applied for the determination of V (V) and Pd (II) in plant, pharmaceutical, water and alloy samples.

iosr journal of applied physics

Simultaneous Third order derivative Spectrophotometric Determination of Vanadium and Palladium Using 2-Hydroxy-1-Naphthaldehyde-P-hydroxy Benzoichydrazone (HNHBH)