title: Spectrophotometric determination of oxalate ion with N,N'-diethyl-N,N'-[[4,4'-dihydroxy-1,1'-binaphthalene]-3,3'-diyl]bisbenzamide and copper(II).
abstract: A simple and rapid spectrophotometric method for the determination of oxalate ion was established by the fading of a colored complex between N,N'-diethyl-N,N'-[[4,4'-dihydroxy-1,1'-binaphthalene]-3,3'-diyl]bisbenzamide and copper(II). Beer's law was obeyed in the concentration range of 0.1 - 2.0 microg cm(-3) for oxalate ion, with an effective molar absorptivity at 533 nm and the relative standard deviation being 8.0 x 10(3) dm(3) mol(-1) cm(-1) and 1.0% (n = 5), respectively. This proposed method has excellent reproducibility, and was applied to recovery tests of oxalate ion in tap water and human urine; the results were satisfactory. This is suggested that the method is based on the reaction of copper(II) to copper(I) with oxalate ion.
authors.affiliation: Osaka University of Pharmaceutical Sciences, Osaka, Japan.
authors.forename: Misa
authors.initials: M
authors.lastname: Tabe
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Fujimoto
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Nakahara
authors.forename: Takako
authors.initials: T
authors.lastname: Yamaguchi
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Fujita
mesh_terms: D001549:Benzamides; D003300:Copper / Q000737:chemistry*; D006801:Humans; D009281:Naphthalenes; D010070:Oxalates / Q000737:chemistry* / Q000652:urine; D013053:Spectrophotometry / Q000379:methods*; D014867:Water / Q000737:chemistry
chemical_list: D001549:Benzamides; C521084:N,N'-diethyl-N,N'-((4,4'-dihydroxy-1,1'-binaphthalene)-3,3'-diyl)bisbenzamide; D009281:Naphthalenes; D010070:Oxalates; D014867:Water; D003300:Copper