Highly Selective Chromium(III) PVC-Membrane Electrodes Based on Some Recently Synthesized Schiff's Bases

✍ Scribed by Mojtaba Shamsipur; Ahmad Soleymanpour; Morteza Akhond; Hashem Sharghi; Moona Hosseini Sarvari

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 180 KB
• Volume: 17
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.200403152

✦ Synopsis

Three recently synthesized Schiffs bases were studied to characterize their ability as Cr 3þ ion carrier in PVCmembrane electrodes. The polymeric membrane (PME) and coated glassy carbon (CGCE) electrodes based on 2hydroxybenzaldehyde-O,O'-(1,2-dioxetane-1,2-diyl) oxime (L1) exhibited Nernstian responses for Cr 3þ ion over wide concentration ranges (1.5 Â 10 À6 -8.0 Â 10 À3 M for PME and 4.0 Â 10 À7 -3.0 Â 10 À3 M for CGCE) and very low limits of detection (1.0 Â 10 À6 M for PME and 2.0 Â 10 À7 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 behavior of the proposed Cr 3þ 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.