probably because <¡»2 was the controlling variable. If inactively adsorbed hydrogen affects the hydrogen overvoltage, however, these arguments do not hold, for both the AG°a nd the hydrogen coverage could be altered.The deviations from linearity, such as those at both lower and higher concentrations, may have been caused by any of the four mentioned variables, as well as by the particular form of the adsorption isotherm for the sulfur compound on the electrode.ACKNOWLEDGMENT We thank J. E. Campbell of the National Center for Urban and Industrial Health and Walter Juda of the Prototech Co. in Cambridge, Mass., for continued interest and helpful discussions.
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