title: Potentiometric determination of trace amounts of aluminium utilizing polyvinyl chloride membrane and coated platinum sensors based on E-N'-(2-hydroxy-3-methoxybenzylidene) benzohydrazide.
abstract: This paper describes the construction and performance characteristics of novel polyvinyl chloride membrane (PME) and coated platinum (CPtE) aluminium (Al) ion selective electrodes based on E-N'-(2-hydroxy-3-methoxybenzylidene) benzohydrazide. The electrodes exhibited linear responses with near Nernstian slopes of 19.9 +/- 0.3 (PME) and 20.1 +/- 0.4 (CPtE) mV/decade of activity within the Al3+ ion concentration range of 3.0 x 10(-7) to 1.0 x 10(-2) M for the PME and 1.0 x 10(-7)-1.0 x 10(-2) M for the CPtE. These sensors were applicable in a pH range of 3.0 to 7.0. The LODs of the PME and CPtE were 1.7 x 10(-7) and 5.6 x 10(-8) M, respectively. They had a response time of less than 10 s and could be used practically for a period of at least 2 months without measurable divergence in results. The isothermal temperature coefficient of the PME was 1.12 x 10(-3) V/degrees C, and it can tolerate partially nonaqueous media up to 25%. The electrodes showed excellent selectivity towards Al3+ ions in the presence of a wide range of alkali, alkaline earth, and transition metals ions. They were successfully applied for the direct determination of Al3+ ions in tap water, aqueduct water, mineral water, and Al-Mg syrup and as indicator electrodes in potentiometric titration of Al ions with EDTA.
authors.affiliation: Shahid Bahonar University of Kerman, Department of Chemistry, Kerman 76169, Iran. tajik_s1365@yahoo.com
authors.forename: Somayeh
authors.initials: S
authors.lastname: Tajik
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Taher
authors.forename: Iran
authors.initials: I
authors.lastname: Sheikhshoaie
mesh_terms: D000535:Aluminum / Q000032:analysis*; D001597:Benzylidene Compounds / Q000737:chemistry*; D002138:Calibration; D006834:Hydrazines / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D008567:Membranes, Artificial; D010984:Platinum / Q000737:chemistry*; D011143:Polyvinyl Chloride / Q000737:chemistry*; D011199:Potentiometry / Q000379:methods*; D013696:Temperature
chemical_list: D001597:Benzylidene Compounds; C580694:E-N'-(2-hydroxy-3-methoxybenzylidene)benzohydrazide; D006834:Hydrazines; D008567:Membranes, Artificial; D010984:Platinum; D011143:Polyvinyl Chloride; D000535:Aluminum