Sometimes when doing research you find the oddest things. Here is a paper I found on separating Ruthenium by Raleigh Gilchrist in the Part of Bureau of Standards Journal of Research, vol. 12, March 1934
ABSTRACT:
A procedure for the separation and gravimetric determination of ruthenium is described. The method of separation differs essentially from existing methods in that the ruthenium is distilled from a solution of its sulphate in diluted sul- phuric acid containing sodium bromate. A very suitable reagent for the quantitative absorption of the distilled tetroxide was found to be diluted hydrochloric acid saturated with sulphur dioxide. The recovery of ruthenium is accomplished by precipitating the hydrated oxide from a boiling solution at pH6, after sulphite compounds have been decomposed by treatment with hydrochloric acid. The hydrated oxide is ignited in the air to an anhydrous oxide which is then reduced to metal under hydrogen.
https://nvlpubs.nist.gov/nistpubs/jres/12/jresv12n3p283_a2b.pdf
ABSTRACT:
A procedure for the separation and gravimetric determination of ruthenium is described. The method of separation differs essentially from existing methods in that the ruthenium is distilled from a solution of its sulphate in diluted sul- phuric acid containing sodium bromate. A very suitable reagent for the quantitative absorption of the distilled tetroxide was found to be diluted hydrochloric acid saturated with sulphur dioxide. The recovery of ruthenium is accomplished by precipitating the hydrated oxide from a boiling solution at pH6, after sulphite compounds have been decomposed by treatment with hydrochloric acid. The hydrated oxide is ignited in the air to an anhydrous oxide which is then reduced to metal under hydrogen.
https://nvlpubs.nist.gov/nistpubs/jres/12/jresv12n3p283_a2b.pdf
