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Chemical durability studies on multi rare earths immobilized simulated oxysilicate apatite wasteforms CaLa3.4Ce0.1Pr0.1Nd0.1Sm0.1Gd0.1Y0.1(SiO4)3O and Ca0.8Sr0.1Pb0.1La3.4Ce0.1Pr0.1Nd0.1Sm0.1Gd0.1Y0.1(SiO4)3O

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Abstract

Chemical durability behavior of simulated crystalline oxyapatite wasteforms CaLa3.4Ce0.1Pr0.1Nd0.1Sm0.1Gd0.1Y0.1(SiO4)3O [WF-1] and Ca0.8Sr0.1Pb0.1La3.4Ce0.1Pr0.1Nd0.1Sm0.1Gd0.1Y0.1(SiO4)3O [WF-2] was studied. Soxhlet leach tests (MCC-5) were conducted and the leachates were analyzed by ICP-MS/OES techniques. The results indicate that the release of ions from the wasteform was found to be strongly dependent on chemical compositions, as WF-1 shows relatively more resistance towards leaching than parent and WF-2. The leachability of immobilized rare-earth ions in WF-1 and WF-2 was found to be negligible. The observed trend of leaching behaviour in all three systems is Si4+ > A2+ > RE3+. Further, the investigation on the mechanism of leaching suggested that the leaching process is predominantly governed by diffusion.

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Acknowledgements

The authors gratefully acknowledge the funding from UGC-DAE-CSR (CSR-KN/CRS-54/2013- 4/653) India and thank VIT, Vellore for providing all required facilities to carry out the experiments.

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This study was funded by UGC-DAE-CSR (CSR-KN/CRS-54/2013- 4/653).

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Authors and Affiliations

  1. Department of Chemistry, School of Advanced Sciences, VIT, Vellore, Tamil Nadu, 632 014, India

    Ramya Ravikumar & Buvaneswari Gopal

  2. Materials Processing Chemistry Section, Materials Chemistry Division, MC and MFCG, Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam, 603102, India

    J. K. Sekar, S. Sriram & S. Vijayalakshmi

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  1. Ramya Ravikumar
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Ravikumar, R., Gopal, B., Sekar, J.K. et al. Chemical durability studies on multi rare earths immobilized simulated oxysilicate apatite wasteforms CaLa3.4Ce0.1Pr0.1Nd0.1Sm0.1Gd0.1Y0.1(SiO4)3O and Ca0.8Sr0.1Pb0.1La3.4Ce0.1Pr0.1Nd0.1Sm0.1Gd0.1Y0.1(SiO4)3O. J Radioanal Nucl Chem 326, 1569–1578 (2020). https://doi.org/10.1007/s10967-020-07436-7

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