A milligram procedure is presented for the analysis of the tellurium and copper groups of A. A. Noyes and W. C. Bray. The scheme provides for the isolation, estimation, and confirmation of 10 micrograms of any member of the groups in the presence of 500 micrograms of any other member. The essential features of the scheme of Noyes and Bray are retained.Rhodium is precipitated by titanous chloride as metallic rhodium, redissolved, and confirmed by the red coloration obtained with stannous chloride. Molybdenum is identified by the blue coloration of the residue of the ether extract, the red coloration produced by potassium thiocyanate, and the precipitation of the black sulfide. The presence of other elcments of the two groups is codrmed by slide tests. Examples show the applicability of the procedure.
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