title: Selective transport of copper(II) ions across a liquid membrane mediated by Piroxicam.
abstract: Piroxicam was found to be a highly selective carrier for uphill transport of Cu2+ ions through a chloroform liquid membrane. The transport occurs via a counterflow of protons from the receiving phase to the source phase. The effects of several parameters on the transport of Cu2+ ions, such as the carrier concentration, pH of the source phase, composition of the receiving phase, and duration are described. A high transport efficiency (98+/-2%) was provided by the carrier for Cu2+ ions in a receiving phase of 0.01 mol l(-1) sulfuric acid after 4 h. Different metal ion transport experiments showed that Cu2+ ions were selectively transported over other ions, such as Co2+, Ni2+, Cd2+, Pb2+, Zn2+, UO2(2+) and ZrO2(2+) . In the presence of fluoride ions (used as a suitable masking agent in the source phase), the interfering effects of UO2(2+) and ZrO2(2+) ions were eliminated. The applicability of the method was tested on a real sample, and the results obtained show that it is potentially useful for solvent extraction of copper.
authors.affiliation: Department of Chemistry, Birjand University, P.O. BOX 414, Birjand, Iran. ssadeghi@birjand.ac.ir
authors.forename: Susan
authors.initials: S
authors.lastname: Sadeghi
authors.forename: Darush
authors.initials: D
authors.lastname: Mohammadzadeh
authors.forename: Jalal Shakhs
authors.initials: JS
authors.lastname: Imampur
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology; D001692:Biological Transport; D002413:Cations, Divalent; D003300:Copper / Q000032:analysis*; D005459:Fluorides / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008567:Membranes, Artificial; D019216:Metals, Heavy / Q000032:analysis; D010894:Piroxicam / Q000494:pharmacology*; D011522:Protons; D012997:Solvents / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods; D013464:Sulfuric Acids / Q000737:chemistry; D013997:Time Factors; D017974:Uranium Compounds / Q000032:analysis; D015040:Zirconium / Q000032:analysis
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D002413:Cations, Divalent; D008567:Membranes, Artificial; D019216:Metals, Heavy; D011522:Protons; D012997:Solvents; D013464:Sulfuric Acids; D017974:Uranium Compounds; D010894:Piroxicam; D003300:Copper; D015040:Zirconium; C012597:uranium dioxide; C033158:sulfuric acid; D005459:Fluorides; C028541:zirconium oxide