12. Determination of Thorium (IV) in Presence of Micellar Medium by Derivative Spectrophotometric Technique 

M. Rameswara Rao*, K. B. Chandrasekhar and N. Devanna

Department of chemistry, Jawaharlal Nehru Technological University, College of Engineering, Anantapur-515002, Andhrapradesh, India.

^*raamesh_1120@yahoo.co.in

ABSTRACT

A simple and sensitive spectrophotometric method has been developed for determination of thorium (IV) using newly synthesized 3-methoxysalcilaldehyde-4-hydroxybenzoylhydrazone (MSHBH) reagent in a micellar medium of Triton X -100 (neutral surfactant). Thorium (IV) forms a yellow coloured water soluble complex with the reagent in acidic buffer medium pH 4.25. Beer’s law obeyed in the range 0.232 to 4.641 μg/ml of          Th (IV) λmax at 394 nm. The molar absorptivity and Sandell’s sensitivity of coloured species are 2.0 x 104 l.mol-1.cm-1 and 0.012 μg/cm2 respectively. Thorium (IV) forms (M: L) 1:1 complex and stability constant of the complex is 1.95 x 105. The developed derivative spectrophotometric method was employed for the determination of thorium (IV) in monazite sand.  

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