title: An oxalate selective electrode based on modified PVC-membrane with tetra-butylammonium--Clinoptilolite nanoparticles.
abstract: A modified PVC-membrane electrode with tetra-butylammonium bromide - Clinoptilolite nano-particles (TBA-NCP) showed good Nernstian slope (29.9±0.6 mV per decade of oxalate concentration) in concentration range of 3.1×10(-7)-8.3×10(-1) mol L(-1) with a detection limit of 1.5×10(-7) mol L(-1). The best performance was obtained with a membrane composition of 31.5% PVC, 62.5% DOP and 6% TBA-NCP in the temperature range of 20-35 °C and the pH range of 4-9. The fast response time and good reproducibility over a period of 3 months are other characteristics of the sensor. The proposed electrode was successfully used as an indicator electrode in titration of oxalate ions with CaCl2 solution. The proposed electrode was also used in direct potentiometric determination of oxalate in many real samples such as: mushroom, black and green tea, spinach and beet.
authors.affiliation: Department of Chemistry, Shahreza Branch, Islamic Azad University, P.O. Box 311-86145, Shahreza, Isfahan, Iran; Young Researchers and Elite Club, Shahreza Branch, Islamic Azad University, Shahreza, Iran.
authors.forename: Zohre
authors.initials: Z
authors.lastname: Hoseini
authors.affiliation: Department of Chemistry, Shahreza Branch, Islamic Azad University, P.O. Box 311-86145, Shahreza, Isfahan, Iran; Young Researchers and Elite Club, Shahreza Branch, Islamic Azad University, Shahreza, Iran; Razi Chemistry Research Center (RCRC), Shahreza Branch, Islamic Azad University, Isfahan, Iran. Electronic address: arnezamzadeh@iaush.ac.ir.
authors.forename: Alireza
authors.initials: A
authors.lastname: Nezamzadeh-Ejhieh
mesh_terms: D004566:Electrodes; D053758:Nanoparticles / Q000737:chemistry*; D010070:Oxalates / Q000737:chemistry*; D011143:Polyvinyl Chloride / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D017641:Zeolites / Q000737:chemistry*
chemical_list: D010070:Oxalates; D000644:Quaternary Ammonium Compounds; C083175:clinoptilolite; D017641:Zeolites; D011143:Polyvinyl Chloride; C009405:tetrabutylammonium
keywords: Clinoptilolite; Oxalate; PVC ion-selective electrode; Tetra-butylammonium bromide