title: Highly selective PVC-membrane electrodes based on Co(II)-Salen for determination of nitrite ion.
abstract: A cobalt(II) derivative was used as a suitable ionophore for the preparation of a polymeric membrane nitrite-selective electrode. The electrode reveals a Nemstian behavior over a very wide NO2- ion concentration range (1.0 x 10(-6)-1.0 x 10(-1) M) and a very low detection limit (5.0 x 10(-7) M). The potentiometric response is independent of the pH of solution in the pH range 4.0-9.5. The electrode shows advantages such as low resistance, fast response and, most importantly, good selectivity relative to a wide variety of inorganic and organic anions. In fact, the selectivity behavior of the proposed NO2- ion-selective electrode shows great improvements compared to the previously reported electrodes for nitrite ion. The proposed electrodes could be used for at least 2 months without any significant changes in potentials. The electrode was successfully applied to the determination of nitrate ion concentrations in sausage and milk samples.
authors.affiliation: Department of Chemistry, Tehran University, Tehran, Iran. Ganjali@khayam.ut.ac.ir
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Ganjali
authors.forename: Morteza
authors.initials: M
authors.lastname: Rezapour
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Pourjavid
authors.forename: Masoud
authors.initials: M
authors.lastname: Salavati-Niasari