title: Sub-micro level monitoring of beryllium ions with a novel beryllium sensor based on 2,6-diphenyl-4-benzo-9-crown-3-pyridine.
abstract: The 2,6-diphenyl-4-benzo-9-crown-3-pyridine (DPCP) was used as an excellent ionophore in construction of a coated graphite poly(vinyl chloride) (PVC)-based membrane sensor. The best performance was obtained with a membrane composition of 30% poly(vinyl chloride), 60% o-nitrophenyloctyl ether (NPOE), 5% 2,6-diphenyl-4-benzo-9-crown-3-pyridine and 5% sodium tetraphenyl borate (TBP). This sensor shows very good selectivity and sensitivity towards beryllium ion over a wide variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The sensor revealed a great enhancement in selectivity coefficients and sensitivity for beryllium, in comparison with the previously reported beryllium electrodes. The electrode exhibits a Nernstian behavior (with slope of 29.6mV per decade) over a very wide concentration range (1.0x10(-7) to 1.0x10(-1)) with a detection limit of 4.0x10(-8)M (360pgml(-1)). It shows relatively fast response time, in whole concentration range (<10s), and can be used for at least 12 weeks in the pH range of 4.5-8.0. The proposed sensor was successfully used to determination of beryllium in mineral ore.
authors.affiliation: Department of Chemistry, Tehran University, P.O. Box 14155 6455, Tehran, Iran.
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Ganjali
authors.forename: Mehdi
authors.initials: M
authors.lastname: Rahimi-Nasrabadi
authors.forename: Bozorgmehr
authors.initials: B
authors.lastname: Maddah
authors.forename: Abolghasem
authors.initials: A
authors.lastname: Moghimi
authors.forename: Madjid
authors.initials: M
authors.lastname: Faal-Rastegar
authors.forename: Shahin
authors.initials: S
authors.lastname: Borhany
authors.forename: Mansour
authors.initials: M
authors.lastname: Namazian