A new indicator reaction for kinetic determination of traces of cobalt.
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.
Duca
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Analytical Chemistry Department and Physical Chemistry Department, Polytechnic Institute, Jassy 6600, Splai Bahlui 71, Romania.
Matei
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Ionescu
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