Abstract
The behavior of Li/La glass electrodes as specific ion sensors for NH +4 and Na+ cations in liquid ammonia solutions at −40°C has been assessed using concentration cells with transference. The measurement of emf's of cells with very high resistances due to glass at −40°C has been overcome partly by the use of thinly blown Li/La glass and mainly through the design and use of a ‘floating shield’ emf measuring system. For solutions of NH4NO3, NH4I, NH4BF4, and NH4Cl almost linear pNH4 vs. emf responses were observed between pNH4 0 and 5; for NH4NO3 solutions the slope (40±1 mV/pNH4) was invariant for substantial increases in Na+ concentrations. Solutions of NaNO3, NaCN, NaClO4, NaNCS, NaN3, and NaNO2 gave almost linear pNa vs. emf responses but the slopes were markedly dependent upon the NH +4 concentration. Estimates of the mean molal ion activity coefficients for nitrate solutions were obtained from earlier transference data: γ±(NaNO3)=0.14±0.02 and γ±(NH4NO3)=0.30±0.03 at 10− molal concentration in fair agreement with earlier data.
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Cheek, Y.M., Gill, J.B., Balt, S. et al. Electrochemistry of solutions in liquid ammonia. Part VII. The use of glass electrodes for ammonium and sodium cations as ion-selective sensors at −40 °C. J Solution Chem 12, 829–846 (1983). https://doi.org/10.1007/BF00643923
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DOI: https://doi.org/10.1007/BF00643923