title: Synthesis and characterization of a new cation exchanger-zirconium(IV)iodotungstate: separation and determination of metal ion contents of synthetic mixtures, pharmaceutical preparations and standard reference material.
abstract: Samples of zirconium(IV)iodotungstate have been synthesized under varying mixing order and ratios of aqueous solution of potassium iodate, sodium tungstate and zirconium oxychloride at pH 1. A tentative formula was proposed on the basis of chemical composition, FTIR and thermogravimetric studies. The material shows a capacity of 0.68 meq g(-1) (for K+) which can be retained up to 200 degrees C. pH titration data reveal its monofunctional behavior. The distribution coefficient values of metal ions have been determined in various solvent systems. A number of important and analytically difficult quantitative separations of metal ions have been achieved using columns packed with this exchanger. In order to demonstrate practical utility of this material, Hg2+ and Pb2+ have been selectively separated and determined in the synthetic mixtures. Assay of Al3+ and Mg2+ in commercial tablets and analysis of lead in the standard reference material have also been attempted.
authors: Analytical Research laboratory, Department of Chemistry, Aligarh Muslim University, Aligarh-202002, India. nabi_syed@rediffmail.com
authors: Syed A
authors: SA
authors: Nabi
authors: Alimuddin
authors: Aminul
authors: A
authors: Islam
mesh_terms: D000535:Aluminum / Q000737:chemistry; D002412:Cations; D002852:Chromatography, Ion Exchange / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry / Q000302:isolation & purification*; D007854:Lead / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D008628:Mercury / Q000737:chemistry; D008670:Metals / Q000737:chemistry / Q000302:isolation & purification; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry / Q000379:methods; D014414:Tungsten / Q000737:chemistry*; D017973:Tungsten Compounds / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D002412:Cations; D007477:Ions; D008670:Metals; D017973:Tungsten Compounds; C546206:zirconium(IV) iodotungstate; D007854:Lead; C025399:sodium tungstate(VI); D015040:Zirconium; D000535:Aluminum; D008628:Mercury; D008274:Magnesium; C026090:zirconium oxychloride; D014414:Tungsten