Vanadium and nickel in petroleums of bituminous Tatar rocks

The vanadium and nickel contents of petroleum obtained from bituminous rock of Ashal'chinsk, Akhmat, Gorskii, Katerchinsk, Klinsk (Studeno-Klyuchev), West-Chumachkin, Mordovian-Karmal' and Pokrov deposits, was determined polarographically. The vanadium concentration range in these petroleums is 0.01-0.09 and nickel 0.009-0.05 wt.%. According to results previously obtained, vanadium and nickel contents in ordinary petroleum of this country are no higher than 0.010 and 0.0014 wt.%, respectively. 3 references, 1 table.