Cobalt Reagents Research Articles

A test for cobalt

Dimethylglyoxime was used by Braley and Hobart 1 as an analytical reagent for cobalt following the researches of Tschugaeff 2 on metallic derivatives of dioximes. Compounds containing ammonia or pyridine were studied, and the brown colorations permitted to detect as little as 5 γ of cobalt. Using the same reagent combined with alkaline sulfides, Feigl and von Tustanowska 3 obtained a violet red coloration which allowed them to detect cobalt ion in a dilution of 1 to 830000. Bertrand and Machebeuf 4 developed a colorimetric method for the determination of cobalt in biological materials. Charottino 5 replaced ammonia by certain amines, chiefly aromatic ones (benzidine), and claimed to have thus increased the sensitivity of the test, which was confirmed by Braun 6. Finally, by the use of toluidine, Spacu and Macaronici 7 attained a still higher sensitivity.

The detection of cobalt, copper and nickel

Ammonium Mercuri thio and selenocyanates in the presence of a zinc salt, have been tried as reagents for cobalt, copper and nickel. Centrifuging the precipitate produced in a capillary enables 0,001γ cobalt or copper and 0,002γ nickel to be recognised at high dilutions. Applications of the method are suggested.

Reagent for cobalt

Reagent for cobalt