Specific adsorption of acetate ions at the mercury—lithium acetate (AQ) interface

✍ Scribed by M.V. Ramanamurti; B.V. Apparao

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 482 KB
• Volume: 23
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(78)80105-4

✦ Synopsis

Specific adsorption of acetate ions at the mercury-lithium acetate (aq) interface has been investigated using both differential capacity and electrocapillary measurements. Variation of charge due to snrface excess of lithium ions (q+) and of charge due to specifically adsorbed acetate ions (q-l) with electrode charge (qH) have been discussed. Such discussion inferred superequivalent adsorption of acetate ions at all positive charges for concentrations of lithium acetate 20.20 M whereas Bin-Markov plots predicted the absence of specific adsorptidn; the prediction of Esin-Markov plots has been shown to be faulty under certain conditions. The plots of #I"-'us 4-l at constant qM for acetate ion resembled the corresponding plots for F-and BF; ions: the slope of these plots is negative up to coverages corresponding to 0.20 M lithium acetate. The identification of the isotherm parameter, (a+"-2/&-')p~ with the reciprocal of inner layer capacity at constant charge d-,C') has been questioned