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The Effect of Electrode Bottom Thickness in Spectrochemical Analysis by the Porous Cup Electrode Technique

Volume 7, Number 1 (Feb. 1953) Page 19-20

Frederickson, Leo D.


Although the direct spectrochemical analysis of solutions has been greatly facilitated by the introduction of the porous cup electrode (1), the literature contains only a limited amount of information concerning the effect of electrode bottom thickness on the behavior of elements in solution. Since capillary action, as well as gravity, has been ascribed as a means whereby liquid penetrates the graphite cup bottom, the question of whether preferential absorption and/or migration of certain ions takes place has arisen in this laboratory. It has been stated (1) that such behavior was doubted, although no specific experiment was designed to determine its existence. In a study of lubricating oils (2) the variable of bottom thickness was investigated, but it appears questionable that the information gained using an oil medium would be useful or related to the behavior of ions in aqueous solutions. The variation among different ions as regards their hydration in solution, their resulting ionic radii, etc., was believed to be sufficient justification for further investigation.