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Separation of 133Ba and 137Cs from Mixtures of 133Ba and 137Cs by Environmentally Benign PEG-Based Aqueous Biphasic System

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Abstract

An aqueous biphasic technique has been developed for enrichment of long-lived 133Ba from mixture of 133Ba–137Cs. The differential behavior of PEG-4000 and PEG-6000 towards 133Ba and 137Cs have been demonstrated wherein the radionuclides were kept in 2 mol·L−1 solutions of various salts like Na-citrate, Na-malonate, Na-tartrate, Na2SO4, Na2S2O3, Na2SO3, (NH4)2SO4, Na2CO3, NaHSO3, K2HPO4, K3PO4 and 6 mol·L−1 KOH. A separation factor ~ 11,250 was achieved at the separating condition of 4 mL 2 mol·L−1 NaHSO3: 3 mL PEG 6000, wherein 133Ba was completely extracted in the PEG rich phase. The influence of pH of salt-rich phases like (NH4)2SO4, Na-tartrate, K3PO4 and Na2CO3 on the extraction behavior of 133Ba and 137Cs was investigated.

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Acknowledgements

Authors are thankful to Professor Susanta Lahiri, Homi Bhabha National Institute, Mumbai and ex-Saha Institute of Nuclear Physics, Kolkata for his valuable suggestions and continuous encouragement.

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  1. Department of Environmental Science, University of Calcutta, Kolkata, 700019, India

    Sayantani Mitra

  2. Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata, 700064, India

    Nabanita Naskar

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Mitra, S., Naskar, N. Separation of 133Ba and 137Cs from Mixtures of 133Ba and 137Cs by Environmentally Benign PEG-Based Aqueous Biphasic System. J Solution Chem 51, 1209–1218 (2022). https://doi.org/10.1007/s10953-022-01197-5

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