Vol. 11 No. 1 (2012): Mapana Journal of Sciences
Research Articles

First Order Derivative Spectrophotometric Determination of Thorium in Geological Samples Using Diacetylmonoxine ρ-hydroxybenzoylhydrazone

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  • Anitha Varghese,
  • A M A Khadar
Anitha Varghese
CHRIST (Deemed to be University), Bengaluru.
Bio
A M A Khadar
Department of Chemistry, Mangalore University, Karnataka.
Bio

Published 2012-01-01

Keywords

  • Thorium(IV),
  • micellar medium,
  • diacetylmonoximeρ-hydroxybenzoylhydrazone,
  • derivative spectrophotometry

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Abstract

A simple, selective and sensitive spectrophotometric method has been developed for the determination of trace amounts of thorium using a newly synthesised reagent diacetylmonoximep-hydroxybenzoylhydrazone (DMPHBH) in the presence of Triton X-100. The molar absorptivity and Sandell’s sensitivity of the coloured species at pH 4.4 were found to be 4.20 x 104 L mol-1 cm-1 and 5.5 ng cm-2, respectively. Beer’s law is obeyed in the range 0.35 -3.8 g mL-1 of thorium(IV) at 410 nm. The stoichiometry of the complex was found to be 1:2 (Th(IV): DMPHBH). A highly selective first order derivative spectrophotometric method for the determination of thorium in the presence of uranium is also reported. The detection limit and quantitation limit of first order derivative spectrophotometry were found to be 0.03 and 0.11 g mL-1, respectively. The developed procedure has been successfully applied for the trace level determination of thorium in rock samples and synthetic mixtures.

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