Abstract
Silicone rubber membranes impregnated with mixtures of cadmium sulfide and silver sulfide were developed as selective electrodes for cadmium ions in a solution. Both co-precipitated and sintered mixtures could be used as the active materials for the electrode membrane, but here the membrane which contained a mixture in which cadmium sulfide had been added to silver sulfide after they had been precipitated individually did not show the satisfactory response characteristics. The Nernstian slope was obtained in the activity range from 10−1 to 10−5 M Cd2+, while the analytical range was from 10−1 to 10−6 M. These potentials did not change at pH values from 2.5 to 7.5. Among common ions, silver, copper(II), mercury(II), iron(III), sulfide, and iodide ions interfered seriously. About 10–100 times as many lead and bromide ions and more than 1000 times as many alkali metals, alkaline earth metals, zinc, aluminum, nickel, manganese(II), cobalt, nitrate, and perchlorate ions were tolerated in coexistence with cadmi...
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