Coated-wire lithium ion-selective electrodes based on polyalkoxylate complexes

ANALYSTANALYST Pub Date: DOI: 10.1039/AN9851001381

Abstract

Barium and lithium adducts of polyalkoxylates have been investigated as sensors in lithium ion-selective electrodes using a microconduit flow injection analysis system. Dioctyl phenylphosphonate (DOPP) and dioctyl 3-nitrophenylphosphonate (N-DOPP) were employed as solvent mediators. Selectivity coefficients, kpotLi,M, for the Ba(PPG 1025)0.69. (TPB)2-DOPP-based lithium electrode in 0.14 M sodium chloride solution are as follows: Na+ 3.7 × 10–2, K+ 4.4 × 10–3, Ca2+ 4.1 × 10–1 and Mg2+ 8.0 × 10–2. The selectivity coefficients are compared with those for two other previously reported lithium electrodes. The barium polyalkoxylate adduct is a better sensor for lithium than its lithium analogue.

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