Abstract
Liquid ion-exchange membrane electrodes, sensitive to potassium, caesium, tetramethyl-, tetraethyl- and tetrabutylammonium cations, were prepared and their response characteristics studied. The membranes of the electrodes were nitrobenzene solutions of tetrakis(4-fluorophenyl)borates of the respective cations. Selectivity coefficients were determined by the modified separate solution method and the reliability of such measurements is discussed. Values of the selectivity coefficients are given for 41 univalent cations in the range of almost 13 orders of magnitude. The values represent constants which are independent of the membrane composition and the activities of both primary and interfering ions in a sample solution. They give comprehensive information not only on the cation interference with the electrode response, but also on the extractability of the cations into nitrobenzene.
Published Version
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