title: Development of a new flow-through bulk optode for the determination of manganese(III).
abstract: A flow-through bulk optode based on the use of 1-(2-pyridylazo)-2-naphthol (PAN) immobilized in a plasticized poly(vinyl chloride) membrane entrapped in a cellulose support, in conjuntion with the flow injection analysis technique, is proposed for the determination of manganese(II). The calibration graph obtained at 570 nm was linear in the range 0.27-27.5 mg L(-1) (5 x 10(-6)-5 x 10(-4) M) Mn(II) with a detection limit of 0.18 mg L(-1). The coefficients of variation of the sensor response for 5.5 mg L(-1) of Mn(II) were +/-0.22% for consecutive measurements (n = 10), +/-0.48% between days (n = 5) and +/-0.38% between different membranes (n = 6). The sensor was readily regenerated with the carrier acetic acid/acetate buffer of pH 4.5. The method was applied to the determination of manganese in steels, waters and lemon tree leaves.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, Spain. spedreno@um.es
authors.forename: C
authors.initials: C
authors.lastname: Sanchez-Pedreño
authors.forename: M S
authors.initials: MS
authors.lastname: García
authors.forename: J A
authors.initials: JA
authors.lastname: Ortuño
authors.forename: M I
authors.initials: MI
authors.lastname: Albero
authors.forename: E
authors.initials: E
authors.lastname: Ballester