Comparative study of neutral carriers in polymeric lithium ion selective electrodes

Abstract

surement conditions using the same plasticizer in all membranes. In addition, comparison is made with a 14-crown-4 ether neutral carrier as reported by Kitazawa et al. (5).Cation complexing properties of a large number of macrocyclic polyether-diester compounds have also been reported (6-19). These compounds generally form weaker complexes than the cyclic polyethers. They have been reported to show significant affinities for alkali, alkaline-earth, and primary alkylammonium cations (12,13,15,16,19). Gadzekpo et al. have reviewed the literature of lithium sensors (20). EXPERIMENTAL SECTION Reagents and Chemicals. High molecular weight poly(vinyl chloride) (PVC) was obtained from Fluka AG. Tris(2-ethylhexyl) phosphate was obtained by U. C. C. Flexoh. All solutions were

3,7‐Dioxaazelaamides as Ionophores for Lithium Ion Selective Liquid Membrane Electrodes

“…-Among the different neutral carrier-based membranes recommended for Li+-selective electrodes [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], only few show acceptable Li+/Na+ selectivities for the potentiometric assay of Li' in blood serum during therapy of manic depressive psychosis …”

Lithium Ion Sensors

“…The group led by Christian investigated the use of ionophores as modifiers in PVC membrane electrodes, and found that 4 and 17 ( Scheme 7 , reported previously by Kitazawa et al [ 26 ]) gave Li + :Na + selectivities of 140:1 and 125:1, respectively [ 27 ]. It was found that the type of plasticizer, trioctylphosphine oxide, tris(2-ethylhexyl)phosphate or o -nitrophenyl octyl ether, and whether or not KT p ClPB was added, gave significant differences in performance with Li + :Na + selectivities ranging from 70:1 and 280:1 in electrodes made to different specifications [ 28 , 29 ].…”

Lithium-selective permeation through lipid bilayer membranes mediated by a di-imide ionophore with nonsymmetrical imide substituents (ETH1810)

“…In the course of the last 15 years, a variety of noncyclic synthetic lithium-selective ionophores have become available [6,9,11,12,23,24,33,35,41]. Among them, in the molecules developed by Simon et al [9,23,24,41] and by Shanzer et al [33], imide oxygens, capable of acting as ligands for Li + , are found to be a conserved structural feature.…”