FIA Potentiometric and Solvent Extraction Studies of Alkali Metal and Alkaline Earth Cation Complexation bybis(Tert-butylbenzo)-21-crown-7
作者:
AbdulrahmanS. Attiyat,
GaryD. Christian,
JosephA. McDonough,
Bozena Strzelbicka,
Mi-Ja Goo,
Zong-Yuan Yu,
RichardA. Bartsch,
期刊:
Analytical Letters
(Taylor Available online 1993)
卷期:
Volume 26,
issue 7
页码: 1413-1424
ISSN:0003-2719
年代: 1993
DOI:10.1080/00032719308017422
出版商: Taylor & Francis Group
关键词: ionophore;crown ether;metal ion complexation;PVC matrix membrane;ion-selective electrode;picrate extraction
数据来源: Taylor
摘要:
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.
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