Experimentally validated extractive spectrophotometric determination method of osmium(VIII) from environmental samples: sequential separation of osmium(VIII), rhodium(III) and ruthenium(III)

An ethanolic solution of 1, 3–bis(hydroxymethyl) benzimidazole–2-thione (BHMBT), in the presence of hydrochloric and perchloric acid (1 mol L−1), reacts with osmium(VIII) to give pink-coloured comp...