COULOSTATIC STUDY OF RESIDUAL OXYGEN IN ELECTROCHEMICAL INVESTIGATIONS.
LOUISIANA STATE UNIV BATON ROUGE COATES CHEMICAL LABS
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Residual oxygen concentrations of about 5 x 10 to the -7th power M. were measured in nitrogenand hydrogen-saturated bufer solutions by the coulostatic method using a hanging mercury drop electrode. Light pre-elctrolysis of the buffer solutions was found to cause very little alteration of the measured values but under some conditions the apparent oxygen concentration became muc smaller and other phenomena occurred. These phenomena were accentuated when the hydrogenused was strongly deoxygenated. In the region of the first oxygen wave a mass transfer-controlled oxidation was predominant, no oxygen rduction currents being observable, but at much more negative potentials a pseudocapacity was observed, a more or less stable rest potential having a range ofvalues being attained in a few seconds almost regardless of the coulostatic carge applied. AUTHOR