title: DDB liver drug as a novel ionophore for potentiometric barium (II) membrane sensor.
abstract: Dimethyl-4,4-dimethoxy-5,6,5',6'-dimethylene dioxy biphenyl-2,2-dicarboxylate (DDB) liver drug is used as a novel ionophore in plasticized poly (vinyl chloride) (PVC) matrix membrane sensors for barium ions. Optimum performance characteristics are displayed by membrane sensor incorporating DDB ionophore, potassium tetrakis(4-chlorophenyl)borate as lipophilic salt, and o-nitrophenyloctyl ether as plasticizer. The sensor exhibits a linear response over the concentration range 10(-1)-10(-5) mol l(-1) BaCl(2) with a Nernstian slope of 30 mV per decade and high selectivity towards Ba(2+) with respect to Li(+), Na(+), K(+), Rb(+), NH(4)(+), Mg(2+), Ca(2+), Sr(2+), Mn(2+), Co(2+), Ni(2+), Cd(2+), Al(3+), La(3+), and Ce(3+) ions. The sensor response is stable over a wide pH range (4-9) and the lifetime is about 2 months. The proposed sensor is successfully applied to the determination of Ba(2+)contents of some rocks.
authors.affiliation: Department of Chemistry, Faculty of Science, Ain Shams University, Cairo, Egypt.
authors.forename: Saad S M
authors.initials: SS
authors.lastname: Hassan
authors.forename: Mohamed B
authors.initials: MB
authors.lastname: Saleh
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Abdel Gaber
authors.forename: Nahed A
authors.initials: NA
authors.lastname: Abdel Kream