Osmium-chemistry » Proof

The element osmium is detected via its compound osmium tetroxide. Although the detection reaction is specific, it is not recommended due to toxicity.

The test solution containing osmium is dropped onto a filter paper that has previously been moistened with a benzidine or potassium ferricyanide solution. If the benzidine solution was used, the filter paper turns purple. In the case of the potassium ferricyanide solution, a light green coloration occurs.

Nowadays, however, more and more instrumental process techniques are being used. Examples are atomic spectrometry, neutron activation analysis and voltametry. With the aid of these methods, more precise determinations are possible.