title: Simultaneous determination of gallium(III) and indium(III) by derivative spectrophotometry.
abstract: A simple, selective and sensitive derivative spectrophotometric method is proposed for the simultaneous determination of gallium(III) and indium(III) in mixtures using 1-(2-pyridylazo)-2-naphthol in cationic micellar medium, without any prior separation. Beer's law is obeyed between 2.80x10(-1)-3.63 and 4.60x10(-1)-9.20 mug ml(-1) concentration of Ga(III) and In(III) at 550 and 542 nm, the isodifferential points of indium and gallium complexes in the first-order derivative mode, respectively. The proposed method is successfully applied for the determination of gallium and indium in standard reference materials and synthetic binary mixtures with a relative error of +/-2.07 and +/-2.55%, respectively.
authors.affiliation: Sri Aurobindo College, Malviya Nagar, New Delhi 110017, India.
authors.forename: V K
authors.initials: VK
authors.lastname: Singh
authors.forename: N K
authors.initials: NK
authors.lastname: Agnihotri
authors.forename: H B
authors.initials: HB
authors.lastname: Singh
authors.forename: R L
authors.initials: RL
authors.lastname: Sharma