title: Determination of arsenate in water by anion selective membrane electrode using polyurethane-silica gel fibrous anion exchanger composite.
abstract: Polyurethane (PU)-silica (Si gel) based fibrous anion exchanger composites were prepared by solid-gel polymerization of polyurethane in the presence of different amounts of silica gel. The formation of PU-Si gel fibrous anion exchanger composite was characterized by Fourier transform infra-red spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA-DTA), scanning electron microscopy (SEM) and elemental analysis. The membrane having a composition of 5:3 (PU:Si gel) shows best results for water content, porosity, thickness and swelling. Our studies show that the present ion selective membrane electrode is selective for arsenic, having detection limit (1×10(-8)M to 1×10(-1)M), response time (45s) and working pH range (5-8). The selectivity coefficient values for interfering ions indicate good selectivity for arsenate (AsO4(3-)) over interfering anions. The accuracy of the detection limit results was compared by PCA-Arsenomat.
authors.affiliation: Analytical and Polymer Research Laboratory, Department of Applied Chemistry, F/O Engineering and Technology, Aligarh Muslim University, Aligarh 202002, India. Electronic address: asifkhan42003@yahoo.com.
authors.forename: Asif Ali
authors.initials: AA
authors.lastname: Khan
authors.affiliation: Analytical and Polymer Research Laboratory, Department of Applied Chemistry, F/O Engineering and Technology, Aligarh Muslim University, Aligarh 202002, India. Electronic address: shakeebashaheen@ymail.com.
authors.forename: Shakeeba
authors.initials: S
authors.lastname: Shaheen
mesh_terms: D000837:Anion Exchange Resins / Q000737:chemistry*; D001149:Arsenates / Q000032:analysis*; D011140:Polyurethanes / Q000737:chemistry; D058428:Silica Gel / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000837:Anion Exchange Resins; D001149:Arsenates; D011140:Polyurethanes; D014874:Water Pollutants, Chemical; D058428:Silica Gel
keywords: Arsenic analyzer; AsO(4)(3−) selective; Characterization; Electrode potential; Ion-selective electrode; PU based anion exchanger