Fine purification of monoisotopic S and S.

We have proposed and tested a combined process for ultrapurification of monoisotopic S and S sulfur, which comprises thermochemical treatment of sulfur vapor on silica and ceria packing, melting with aluminum, and distillation. The impurity composition of the purified sulfur has been determined by atomic emission and IR spectroscopy. We have obtained monoisotopic S and S sulfur samples comparable in chemical purity to high-purity sulfur of natural isotopic composition. [ABSTRACT FROM AUTHOR]