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Updated: Jun 8, 2026
Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level
Published on: June 6, 2018
Separation of 90Y from 90Sr by a solvent extraction method using N,N,N',N'-tetraoctyl diglycolamide (TODGA) as the
S Dutta1, P K Mohapatra, V K Manchanda
1Planning & Corrdination Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India.
Abstract:
The relative extraction efficiency of N,N,N',N'-tetraoctyl diglycolamide (TODGA) towards Y(3+) and Sr(2+) was investigated from HNO(3) as well as HCl medium. The separation factor (S.F.) values were found to be much higher in HCl medium as compared to those obtained from HNO(3) medium. Based on the high separation factor values obtained in the HCl media, a separation method for (90)Y from (90)Sr (containing (90)Y in secular equilibrium) has been developed in the present work. The purity of the separated (90)Y was ascertained from its decay profile and half-life measurements. The extracted species was determined to be Y(X)(3) · 3TODGA where X(-) is the nitrate or the chloride anion. The thermodynamic parameters were also determined and the two phase extraction constants (log K(ex)) were calculated. The extraction of Y(III) was highly exothermic and entropy destabilized and was equally favourable from both HNO(3) medium as well as HCl medium.
