A new indicator reaction for kinetic determination of traces of cobalt.

ABSTRACT

The reduction of dissolved oxygen by SO(2-)(3) in feebly alkaline media is catalysed by Co(2+) ions. By use of an electrochemical sensor for oxygen, the optimum analytical conditions for determining traces of the catalyst have been established. At 25 degrees the optimum conditions are pH = 8.25 and [SO(2-)(3)] 1.25 x 10(-3)M. Under these conditions cobalt may be determined in the range 1-7 x 10(-7)M.