Abstract
Droptime, current-voltage and current-time curves were used to study the influence of sodium alkyl sulfates, C8 to C18, on polarographic processes at the dropping mercury electrode. The adsorption at the mercury-solution interface increases with the length of the alkyl chain. However, the usefulness of the C14, C16, and C18 alkyl sulfates as maximum suppressors is limited by formation of micelles and insoluble salts. The alkyl sulfates function more efficiently as maximum suppressors the more positive the break-off potential of the maximum. For the alkyl sulfates of chain length C14 and less, the maximum suppression points were found to occur at much lower concentrations than the critical micelle concentrations. Thus, contrary to earlier findings, these two parameters are not the same.
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