Lithium Ion-Selective Electrode

Abstract

Abstract: Making use of the extraction chemistry of lithium, a PVCmembrane lithium ion-selective electrode based on 1-phenylazonaphthol-2 (sutan Ⅰ) and tri-n-octylphosphine oxide (TOPO) was prepared.The membrane composition was optimized by orthogonal polynomial regression.Amembrane containing 4.5 mg sutan Ⅰ and 9.0 mg TOPOand 180 mg solvent mediator was obtained.The slope of the electrode was 51.7 mV/decade, with the linear range of 2.0 × 10^-5-0.1 mol/Land the detection limit of 4.0× 10^-6 mol/L.The electrode showed moderate selectivities for Li⁺ over Na⁺ and K⁺, and was applied to the assary of lithium in Li₂CO₃ tablets with satisfactory results.

Key words: 1-Phenylazonaphthol-2, Tri-n-octylphosphine oxide, Lithium, Ion-selective elec-trode

TrendMD:

ZHANG Zeng-Rong, YU Ru-Qin. Lithium Ion-Selective Electrode[J]. Chem. J. Chinese Universities, 1993, 14(12): 1658.

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Lithium Ion-Selective Electrode

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