title: Lead-selective membrane potentiometric sensor based on an 18-membered thiacrown derivative.
abstract: A PVC-based membrane electrode for lead ions based on hexathia-18-crown-6-tetraone as membrane carrier was prepared. The influence of membrane composition, pH of test solution and foreign ions on the electrode performance were investigated. The electrode showed a Nernstian response over a lead concentration range from 1.0 x 10(-6) to 8.0 x 10(-3) M at 25 degrees C, and was found to be very selective, precise and usable within the pH range 3.0-6.0. The electrode was successfully used as an indicator electrode in potentiometric titration of lead ions and in direct determination of lead in water samples.
authors.affiliation: Department of Chemistry, Razi University, Kermanshah, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Shamsipur
authors.forename: M R
authors.initials: MR
authors.lastname: Ganjali
authors.forename: A
authors.initials: A
authors.lastname: Rouhollahi
mesh_terms: D000465:Algorithms; D043844:Crown Ethers; D004566:Electrodes; D006573:Heterocyclic Compounds, 1-Ring / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007854:Lead / Q000032:analysis*; D008567:Membranes, Artificial; D011143:Polyvinyl Chloride; D011199:Potentiometry; D013457:Sulfur Compounds; D014874:Water Pollutants, Chemical / Q000032:analysis*; D047248:Crown Compounds
chemical_list: D043844:Crown Ethers; D006573:Heterocyclic Compounds, 1-Ring; D007202:Indicators and Reagents; D007854:Lead; D008567:Membranes, Artificial; D011143:Polyvinyl Chloride; D013457:Sulfur Compounds; D014874:Water Pollutants, Chemical; C441452:1,4,7,10,13,16-hexathia-18-crown-2,3,11,12-tetraone; D047248:Crown Compounds