Abstract
A simple and sensitive spectrophotometric method has been developed for the determination of Thorium (IV) using newly synthesized reagent 3,5-Dimethoxy-4-hydroxybenzaldehyde isonicotinoyl hydrazone (DMHBIH). Thorium (IV) forms an Yellow coloured water soluble complex with the reagent in acidic medium pH 3.0. The molar absorptivity and Sandell’s sensitivity of coloured species are 4.84 x 104 L.mol-1 cm-1 and 0.0083 μg/cm2 respectively. Beer’s law is obeyed in the range 0.580-5.80 μg/ml of Thorium(IV) at λmax at 390 nm. Thorium (IV) forms a 1:1 complex and stability constant of the complex is 4.176 x 106. the developed derivative spectrophotometric method has been satisfactorily applied for the determination of Thorium (IV) in monazite sand.
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