P. KENNEDY, M. PETRONIO, AND H. GISSER
102 efficients of 0 and R are of the same order of magnitude, an increase in the concentration of the reactant 0 causes a decrease in the slope of the wave until the minimum slope corresponding to total irreversibility is reached. Simultaneously the wave shifts along the potential axis toward more negative values. (2) If the adsorption coefficients of 0 and R are of different orders of magnitude, besides the above mentioned shift of El,2lan ap-
preciable difference is observed between the slopes of the curves given, respectively, by solutions of 0 and R of equal concentrations. In this connection the species preferentially adsorbed gives waves with higher slopes. Further experimental investigations are in progress in this institute in order to point out the influence of adsorption of reactant and electrode products upon polarographic and voltametric curves.
The Adsorption of Dinonylnaphthalenesulfonates on Metal Oxide Powders1
by Paul Kennedy, Marco Petronio, and Henry Gisser Pitman-Dunn Research Laboratories, Frankford Arsenal, Philadelphia, Penns$vania
19137
(Received June 9, 196'9)
The adsorption of oleophilic rust inhibitors, sodium and barium dinonylnaphthalenesulfonate, from cyclohexane solution on nickel(II1) oxide and iron(II1) oxide was investigated. Rate data for adsorpt
