title: Rapid and precise coulometric determination and separation of redox inert ions based on electrolysis for ion transfer at the aqueous|organic solution interface.
abstract: Flow systems for precise and accurate coulometric determinations of ions that were developed on the basis of electrolytic ion transfer at the aqueous|organic solution (W|O) interface are reviewed. The electrolysis cell in the system is composed of a porous poly(tetrafluoroethylene) tube (1.0 mm inner diameter), a metal wire (0.8 mm diameter) inserted into the tube, O into which the tube is immersed, a reference electrode in O and a platinum wire counter electrode in O. The electrolysis is carried out by forcing W containing a species of interest to flow through the narrow gap between the tube and the metal wire. The coulometric determination can be performed with an efficiency of more than 99% and a precision of better than 0.2% based on the ion transfer under an optimum condition, even if the ion is redox inert such as Na(+), K(+), Mg(2+), Ca(2+), ClO(4)(-), picrate or alkylsulfonates. The system can be applied to selective electrolytic solvent extraction of ions.
authors.affiliation: Kyoto Institute for Interesting Chemistry, 40-5 Sakuradani Kamikazan, Yamashina, Kyoto 607-8466, Japan. kiharas-chem@zeus.eonet.ne.jp
authors.forename: Sorin
authors.initials: S
authors.lastname: Kihara
authors.forename: Megumi
authors.initials: M
authors.lastname: Kasuno
mesh_terms: D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004572:Electrolysis / Q000295:instrumentation / Q000379:methods*; D007477:Ions / Q000032:analysis / Q000302:isolation & purification; D009930:Organic Chemicals / Q000737:chemistry*; D010084:Oxidation-Reduction; D012996:Solutions; D014867:Water / Q000737:chemistry
chemical_list: D007477:Ions; D009930:Organic Chemicals; D012996:Solutions; D014867:Water