期刊
ELECTROANALYSIS
卷 17, 期 9, 页码 776-782出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200403152
关键词
Cr3+ ion-selective electrodes; PVC-membrane; Schiff's base; potentiometry
Three recently synthesized Schiff's bases were studied to characterize their ability as Cr3+ ion carrier in PVC-membrane electrodes. The polymeric membrane (PME) and coated glassy carbon (CGCE) electrodes based on 2-jydroxybenzaldehyde-O,O'-(1,2-dioxetane-1,2-diyl) oxime (L1) exhibited Nernstian responses for Cr3+ ion over wide concentration ranges (1.5 x 10(-6) M for PME and 2.0 x 10(-7) M for CGCE). The proposed potentiometric sensors manifest advantages of relatively fast response and, most importantly, good selectivities relative to a wide variety of other cations. The selectivity behaviour of the proposed Cr3+ ion-selective electrodes revealed a considerable improvement compared to the best previously PVC-membrane electrodes for chromium(III) ion. The potentiometric responses of the electrodes are independent of pH of the test solution in the pH range 3.0-6.0. The electrodes were successfully applied to determine chromium(III) in water samples.
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