title: Determination of terbium in phosphate rock by Tb3+-selective fluorimetric optode based on dansyl derivative as a neutral fluorogenic ionophore.
abstract: For the first time a highly sensitive and selective fluorimetric optode membrane was prepared for determination of trace amounts of Tb(III) ions in phosphate rock samples. The Tb(III) sensing system was constructed by incorporating 5-(dimethylamino)-N'-(2-hydroxy-1-naphthoyl) naphthalene-1-sulfonohydrazine (L) as a neutral Tb(III)-selective fluoroionophore, in the plasticized PVC membrane containing sodium tetraphenyl borate as a liphophilic anionic additive. The response of the optode is based on the strong fluorescence quenching of L by Tb(3+) ions. At a pH value of 5.0, the optode displays a wide concentration range of 1.0 x 10(-7) to 1.0 x 10(-2)M, with a relatively fast response time of less than 45 s. In addition, to high stability and reproducibility, the sensor shows a unique selectivity towards Tb(3+) ion with respect to common cations. The optode was applied successfully to the trace determination of terbium ion in binary mixture and water samples and the determination of Tb(3+) in phosphate rock samples.
authors.affiliation: Department of Chemistry, Islamic Azad University, Savadkooh Branch, Savadkooh, Iran. smhosseini@khayam.ut.ac.ir
authors.forename: Morteza
authors.initials: M
authors.lastname: Hosseini
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Ganjali
authors.forename: Bahareh
authors.initials: B
authors.lastname: Veismohammadi
authors.forename: Farnoush
authors.initials: F
authors.lastname: Faridbod
authors.forename: Shiva Dehghan
authors.initials: SD
authors.lastname: Abkenar
authors.forename: Parviz
authors.initials: P
authors.lastname: Norouzi
mesh_terms: D003619:Dansyl Compounds / Q000737:chemistry; D004566:Electrodes; D005456:Fluorescent Dyes / Q000737:chemistry; D005470:Fluorometry / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007476:Ionophores / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D013725:Terbium / Q000032:analysis*; D013997:Time Factors
chemical_list: D003619:Dansyl Compounds; D005456:Fluorescent Dyes; D007476:Ionophores; D010710:Phosphates; D013725:Terbium; C029038:dansyl chloride