Selectivity coefficient lithium electrode

A 14-crown-4 derivative has also been incorporated in a PVC membrane to construct a coated-wire lithium ion-selective electrode used for the determination of lithium in blood sera, after on-line dialysis separation in a FIA system [6]. An estimation of the overall selectivity of the method over the sodium content, including that of the dialysis membrane and the electrode, resulted in a selectivity coefficient k of 1/50. This selectivity is not sufficient to overcome interferences from relatively large fluctuations in sodium contents, and corrections based on a simultaneous evaluation of the sodium content are required under such circumstances. 

Room-temperature ionic liquids (RTILs) are intrinsic ionic conductors which have been successfully employed as nonflammable/nonreactive electrolytes in a range of electrochemical devices, including dye-sensitized solar cells [1,2], lithium batteries [3], fuel cells [4], and supercapacitors [5]. The quantification of mass transport is of interest in any solvent, particularly those employed in electrochemical devices, as it affects the ultimate rate/speed at which the device can operate. The diffusivity or diffusion coefficient (D) of a redox active species, along with other thermodynamic parameters such as the bulk concentration (c) and the stoichiometric number of electrons (n) that are of fundamental significance in any study of an electrode reaction, can be determined experimentally using a range of electroanalytical techniques [6], As with any analytical method, the ideal electroanalytical technique for parameter characterization should be accurate, reproducible, selective, and robust. In many respects voltammetric methods meet these requirements, since they can be... 

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