Chromium(III) Potentiometric Sensor Based on Para-Tertiary-Butyl Calix[4]arene

✍ Scribed by Hayedeh Bagheri Sadeghi; Atefeh Tamaddon; Hadi Afifinia; Nasim Almasian; Fatemeh Bozorgvar; Somayeh Mollaei

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 263 KB
• Volume: 23
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.201100220

✦ Synopsis

Abstract

A new chromium(III) PVC membrane sensor incorporating p‐tertiary‐butyl calix[4]arene as ionophore, potassium tetrakis as additive and dibutyl phthalate (DBP) as plasticizer was constructed. The electrode exhibited an excellent potentiometric response over a wide concentration range of 1.0×10^−7^–1.0×10^−1^ M with a Nernstian slope of 20±0.5 mV per decade. The detection limit was 5.0×10^−8^ M. The electrode showed a better performance over a pH range of 3.0–8.0, and had a short response time of about <15 s.The electrode was successfully applied to potentiometric titration of Cr (III) with EDTA and for direct determination of chromium(III) in waste water.