title: Derivative spectrophotometric determination of copper(II) in non-ionic micellar medium.
abstract: A photometric method for trace analysis of Cu(II) with 1-(2-pyridylazo)-2-naphthol (PAN) in presence of a neutral surfactant, Triton X-100, has been reported in normal and derivative modes. The molar absorption coefficient () and Sandell's sensitivity (S) of PAN-Cu(II) complex at 555 nm is 5.21 x 10(4) l mol(-1) cm(-1) and 1.22 ng cm(-2) respectively. The detection limit of Cu(II) is 4.0 ng ml(-1) and Beer's law is obeyed in the range 0.08-4.00 mug ml(-1) of the analyte. Copper content of a number of commercially available alcoholic beverages, biological and standard alloy samples is reported. The results obtained are in excellent agreement with those obtained using AAS.
authors.affiliation: Department of Chemistry, University of Delhi, Delhi 110007, India.
authors.forename: N K
authors.initials: NK
authors.lastname: Agnihotri
authors.forename: V K
authors.initials: VK
authors.lastname: Singh
authors.forename: H B
authors.initials: HB
authors.lastname: Singh