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Extraction behavior of Mo and W from H2SO4 and HF/HCl solutions into toluene with Aliquat336: sulfate and fluoride complex formation of Mo and W towards chemical studies of seaborgium (Sg)

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Abstract

We have studied extraction behavior of group-6 elements Mo and W to search for suitable conditions for an on-line extraction experiment of their heavier homolog, seaborgium (Sg). Batch-wise extraction of carrier-free radiotracers 93mMo and 177,179,181W were carried out from 0.10 – 8.6 M H2SO4 and 1.0 × 10−4 − 5.0 M HF/1.0 M HCl into toluene with a quaternary ammonium compound, Aliquat336. Anionic sulfate complexes of Mo and W with charge − 2 were extracted with Aliquat336 from H2SO4 solutions with concentrations of [H2SO4] > 2 M. In HF/1.0 M HCl, oxyfluoro complexes of Mo and W with charge − 1 were interpreted to be formed and extracted with Aliquat336. From these results, favorable conditions for the extraction of Sg are discussed.

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Acknowledgements

This work was performed at the RI Beam Factory operated by RIKEN Nishina Center and CNS, University of Tokyo. The authors express their gratitude to the crew of the RIKEN AVF cyclotron for their excellent beam operation during the course of the experiments. This research was partially supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid No. 25790085.

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Correspondence to Atsushi Toyoshima.

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Toyoshima, A., Mitsukai, A., Tsukada, K. et al. Extraction behavior of Mo and W from H2SO4 and HF/HCl solutions into toluene with Aliquat336: sulfate and fluoride complex formation of Mo and W towards chemical studies of seaborgium (Sg). J Radioanal Nucl Chem 317, 421–430 (2018). https://doi.org/10.1007/s10967-018-5882-5

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