different ion-pair association constants. The data for KBr are given in Table I.Once a value of E°is well established for a particular metal/metal-ion electrode, it is possible to determine potentiometrically the ion-pair formation constants of all the soluble 1:1 salts of that metal by application of the equation:where (M+) = antilog (E -E°MiM+)/0.05916 and the experimental values of E are corrected for liquid junction potentials. ACKNOWLEDGMENT I am grateful to Ward B.
The opinions or assertions contained herein are the private views of the authors and are not to be construed as reflecting the views of the Department of the Army of the Department of Defense.
An electrode sensitive for diethyldithlocarbamate Ions (DDC) down to 10'5 M Is prepared by precipitation of copper dlethyldlthiocarbamate and silver sulfide within a graphite rod. The electrode Is used as a monitor for simultaneous titration of binary, tertiary, and quaternary metallic mixtures of Cu, Cd, NI, Pb, V, Th, and Zn In 50-75 % ethanol at pH 4-6 using NaDDC as a titrant. Stepwise titration curves with sharp end
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