Reagent Purification by Mercury Cathode Electrolysis I: A Practical Guide

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Abstract
Mercury cathode electrolysis has been recognized for decades as having the potential for being extremely effective for purifying aqueous solutions of various reagents.1 However, practical use of the method for reagent purification has been largely restricted to the preparation of purified electrolytes for electrochemical studies, for electroanalytical separations, or for polarographic analyses. Although much information on the use of the mercury cathode for analyses has been revieewd,2,3 information on its general application for preparing pure analytical reagents is relatively sparse and scattered throughout the literature. During the present investigators' quest to apply this principle on a general basis, no manuscript was found that comprehensively covered the basic aspects of the method with emphasis on purification. This manuscript was prepared as a practical guide for the general analytical chemist who critically needs ultrapure chemicals particularly amenable to purification by the mercury cathode process.

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