title: Nitrate-selective membrane electrode based on bis(2-hydroxyanil)acetylacetone lead(II) neutral carrier.
abstract: A nitrate-selective electrode based on a recently synthesized bis(2-hydroxyanil)acetylacetone lead(II) complex [(haacac)Pb] has been developed. Among different compositions studied, a membrane containing 30.7% poly(vinyl chloride) (PVC), 61.3% dibutyl phthalate (DBP) as a plasticizer, 3% methyltrioctylammonium chloride (MTOAC) as a cationic additive and 5% ionophore (all w/w) exhibited the best potentiometric response toward nitrate ion in aqueous solutions. The potentiometric response of the electrode was linear with a Nernstian slope of -58.8 mV decade(-1) within the NO3- concentration range of 2 x 10(-5)-1 x 10(-1) mol dm(-3). The response time of the electrode was < or =10 s over the entire linear concentration range of the calibration plot. The electrode is suitable for use within the pH range of 5.3-11. The selectivity coefficients for the proposed electrode were improved for some interferences, when compared with those of commercially available nitrate-selective electrodes.
authors.affiliation: College of Chemistry, Isfahan University of Technology, Isfahan, Iran.
authors.forename: Alireza
authors.initials: A
authors.lastname: Asghari
authors.forename: Mohammad K
authors.initials: MK
authors.lastname: Amini
authors.forename: Hassan R
authors.initials: HR
authors.lastname: Mansour
authors.forename: Masood
authors.initials: M
authors.lastname: Salavati-Niasari
authors.forename: Maryam
authors.initials: M
authors.lastname: Rajabi