A differential capacity measurement showed that the zero charge potential of a lead electrode in a sodium methanesulfonate solution was −0.69 V. Like sulfate anions, methanesulfonate anions had low specific adsorbability on lead. The adsorption of n-butanol from a methanesulfonate electrolyte on a lead electrode was approximated by the Frumkin isotherm equation. The parameters of n-butanol adsorption in a methanesulfonate solution were close to those reported for fluoride and sulfate solutions in the literature.