Y. Bambardekar, Pravin U. Singare, R.S. Lokhande, Selective Separation of Cerium from Lanthanides by Extractive Photometry Using HDBE as Novel Reagent, Volume 12, International Letters of Chemistry, Physics and Astronomy (Volume 12)
https://www.scipress.com/ILCPA.12.144
Abstract:
    Striking similarities in properties of lanthanides make their separation a difficult task. Development of highly selective analytical reagent hexane-2,5-dione-bis(ethylenediamine) HDBE that forms brown coloured complex with Ce(IV) which is quantitatively extracted into xylene at pH 6.4. Transfer of extracted complex to organic phase is very fast (&lt;1min.). Optimum concentration of reagent required for complexation and full colour development is very low (0.8 cm3 of 0.1 % HDBE). Absorption maximum exhibited at 518 nm. Beer’s law is obeyed in the detectable range 0.3-4.0 ppm. The molar absorptivity and Sandell’s sensitivity values are 0.421·10<sup>4</sup> dm<sup>3</sup>· mol<sup>-1</sup>·cm<sup>-1</sup> and 0.017 µg·cm<sup>-2</sup> respectively. The present method is time honoured, permits selective separation of cerium from associated lanthanones using HDBE as a novel complexing agent.
Keywords:
    Beer’s Law, Extracted Complex, HDBE, Lanthanides, Molar Absorptivity, Sandell Sensitivity, Xylene