Synthesis of 2-Hydroxy-3-Methoxy Benzaldehyde Thiosemicarbazone (HMBATSC) and its Application for Direct and Second Derivative Spectrophotometric Determination of Palladium(II)

2-Hydroxy-3-methoxy benzaldehyde thiosemicarbazone (HMBATSC) has been synthesized and its analytical applications are investigated. A rapid, simple, sensitive and selective spectrophotometric method is developed for the determination of palladium (II) in aqueous dimethyl formamide (DMF). Palladium (II) forms a yellowish M₂L₃ complex with 2-hydroxy-3-methoxy-benzaldehyde green coloured thiosemicarbazone in the pH range 1.0-7.0 at room temperature. The complex shows absorption maximum at 380nm with molar absorptivity and Sandell's sensitivity of 2.198 × 10⁴ l mol^-1 cm^-1 and 0.049μg cm^-2 respectively. Beer's law is obeyed in the range of 0.426 to 4.257 μg ml^-1 of Pd (II). A second order derivative spectrophotometric ethod for the determination of palladium (II) has also been proposed. Interference of various diverse ions has been studied. The proposed method is successfully applied for the determination of palladium in alloy steels and in hydrogenation catalysts.