POLAROGRAPHIC-DETERMINATION ON MOLYBDENUM IN ROCKS AFTER SEPARATION WITH PAPER-ELECTROPHORESIS

A granitic rock of Figueiras, Parana Brazil is an important source of uranium and molybdenum The determination of molybdenum was performed b y differential pulse polarography in acidic nitrate media The previous separation of interfering substances like iron, silicon, aluminum cal cium, barium, sodium lead and uranium was carried out in two steps. Th e first step was the precipitation of lead molybdenum, arsenic, cadmiu m, and palladium as sulfides. in the second step, paper electrophoresi s was used for molybdenum separation. The average Mo concentration fou nd was 0.48 % (w/w) and the results were in agreement with the spectro photometric method using alizarin-complexone as complexing reagent.