Development of cupric ion selective electrode using 5-octyloxymethyl-8-quinolinol.
Open Access
- 1 January 1992
- journal article
- Published by Japan Society for Analytical Chemistry in BUNSEKI KAGAKU
- Vol. 41 (3) , 153-155
- https://doi.org/10.2116/bunsekikagaku.41.3_153
Abstract
Cupric ion selective membrane was prepared by using Cu(5-octyl oxymethyl-8-quinolinol), as the ion-sensing material, dioctyl phenyl phosphonate (DOPP) as the solvent mediator and PVC as the membrane matrix. A linear log ace-potential curve was obtained within the cupric ion activity range from 8× 10-6 to 10-1 mol dm-3: the slope was 35 mV decade-1 when the ISE membrane was composed of 5 mg of cupric ion-sensing matrial, 250 mg of DOPP and 50 mg of PVC. The ISE exhibited a constant potential within the pH range from 2.8 to 5.2. The selectivity coefficients of the ISE for Zn2+, Mg2+ and Ni2+ were one several thousandths compared with those of the ISE which was made of Cu(8-quinolinol)2 as the cupric sensitive matrial. These effects should be ascribed to the steric effect of 5-octyl oxymethyl of the ion-sensing matrial.Keywords
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