FIA potentiometric and solvent extraction studies of alkali metal and alkaline earth cation complexation by bis(tert-butylbenzo)-21-crown-7

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Analytical Letters; (United States)

DOI:https://doi.org/10.1080/00032719308017422· OSTI ID:5782817

Attiyat, A S ^[1]; Christian, G D ^[2]; McDonough, J A; Strzelbicka, B; Goo, M J; Yu, Z Y; Bartsch, R A ^[3]

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1. Yarmouk Univ., Irbid (Jordan)
2. Univ. of Washington, Seattle, WA (United States)
3. Texas Tech Univ., Lubbock, TX (United States)

A flow injection analysis study of the potentiometric selectivity of bis[4(5)-tert-butylbenzo]-21-crown-7 (D(tBB)21C7) for cesium over the other alkali metal cations and three alkaline earth cations has been conducted. A PVC matrix membrane containing D(tBB)21C7 as an ionophore was coated on the tip of a silver wire incorporated in a flow cell. No selectivity for cesium over rubidium and only low selectivity over potassium were noted. However, very high selectivities for cesium over sodium, lithium, strontium, calcium, and magnesium were observed. Selectivity of D(tBB)21C7 in the solvent extraction of alkali metal cations was determined by the picrate extraction method. The percent extraction into deuteriochloroform decreased in the order cesium, rubidium > potassium >> sodium >> lithium. Thus good agreement was observed between the responses of D(tBB)21C7 towards alkali metal cations in polymeric membrane electrodes and in solvent extraction. 19 refs., 1 fig., 3 tabs.

• OSTI ID: 5782817
• Journal Information: Analytical Letters; (United States), Vol. 26:7; ISSN 0003-2719
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CESIUM
SOLVENT EXTRACTION
CALCIUM
CESIUM COMPLEXES
CROWN ETHERS
LITHIUM
MAGNESIUM
MEMBRANES
POTASSIUM
POTENTIOMETRY
RUBIDIUM
SODIUM
STRONTIUM
ALKALI METAL COMPLEXES
ALKALI METALS
ALKALINE EARTH METALS
COMPLEXES
ELEMENTS
ETHERS
EXTRACTION
METALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
SEPARATION PROCESSES
TITRATION
400105* - Separation Procedures