title: Simultaneous determination of beryllium and aluminium in mixtures using derivative spectrophotometry.
abstract: The spectrophotometric determination of beryllium and aluminium with 5,8-dihydroxy-1,4-naphthoquinone in the presence of a non-ionic surfactant is reported. Absorption maxima, molar absorptivity and Sandell's Sensitivity of 1:2 (M:L) beryllium and aluminium complexes are, 585 nm and 598 nm, 1.63 x 10(4) l.mole(-1).cm(-1) and 2.04 x 10(4) l.mole(-1).cm(-1), and 0.55 ng/cm(2) and 1.32 ng/cm(2) respectively. Beer's law is obeyed between 7.20-3.96 x 10(2) ng/ml beryllium and 1.08 x 10(1)-1.08 x 10(3) ng/ml aluminium. A method for simultaneous determination of beryllium and aluminium in their mixture using derivative spectra is described. The range 3.6 x 10(1)-3.6 x 10(2) ng/ml beryllium could be determined in the presence of 1.08 x 10(2)-1.08 x 10(3) ng/ml aluminium, and vice versa.
authors.affiliation: Department of Chemistry, University of Delhi, Delhi 110007, India.
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
authors.forename: V K
authors.initials: VK
authors.lastname: Singh