Klaus, Karl Karlovich
Born Jan. 11 (22), 1796, in Tartu; died there Mar. 12 (24), 1864. Russian chemist; corresponding member of the St. Petersburg Academy of Sciences (1861).
Klaus became a professor of chemistry at the University of Kazan in 1839 and a professor of pharmacy at the University of Dorpat in 1852. In 1841 he began research on platinum metals, and in 1844 he discovered a new element in platinum ore residues from the Urals, which he named ruthenium, after the Late Latin Ruthenia (”Russia”). Klaus obtained ruthenium in pure form, studied its chemical properties, determined its atomic weight, and demonstrated the similarity between rutheniumrhodium-palladium and osmium-iridium-platinum triads. Klaus is also known for his studies of the flora of the Volga region and the steppes of the Caspian Sea area.