• Mohan Katyal

      Articles written in Proceedings – Section A

    • Spectrophotometric determination of thorium using chrysin

      Mohan Katyal R P Singh

      More Details Abstract Fulltext PDF

      Chrysin forms a yellow coloured complex with thorium. This colour reaction has been investigated and utilised for spectrophotometric determination of thorium. The colour has maximum intensity at pH 2·8. It obeys Beer-Lambert’s law at 380 mµ between the concentration limits of 2 and 36 p.p.m. of thorium. The molar composition of the complex has been found to be 1:1.

    • Spectrophotometric determination of zirconium and other colour reactions by galangin

      Mohan Katyal R P Singh

      More Details Abstract Fulltext PDF

      The spectrophotometric determination of zirconium is described, based on the formation of a yellow coloured complex between zirconium and galangin. Maximum absorption by the reaction product only at one specific wavelength (410 mµ) in the acidity range of 0·5 N-HCl to pH 4·5, suggests the formation of only one complex. The complex, not extractable by usual organic solvents, has been studied in 40% alcoholic medium. It obeys Beer’s law from 1 to 6 p.p.m. of metal ion concentration and contains the two components in the molar ratio of 1:1. The effect of the reagent on other ions has been qualitatively studied. Also, the effect of foreign ions on the complex has been investigated.

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