title: Quantification of ultra-trace amounts of copper by using  off-line solid phase extraction-flame atomic absorption  spectrometric determination through the octadecyl  silica-bonded phase membrane (OSPM) C18 disks  impregnated with 2,2'-[ethane-1,2-diylbis(thio)]dianiline.
abstract: This study reports a very selective, easy, and precise method for rapid separation of trace amounts of copper in aqueous samples using octadecyl silica-bonded phase membrane disks modified by 2,2'-[ethane-1,2-diylbis(thio)]dianiline (EDTD) combined with flame atomic absorption spectrometric determination. In addition, the synthesis and spectral characterization of EDTD have been described in detail. All the affecting experimental variables such as pH, amount of modifier, eluent type, sample and eluent flow rate, interfering ions, and disk capacity were also investigated. The target analyte (trace copper) was quantitatively retained at pH = 4 and eluted with 6.0 mL of 0.5 M HNO3 at flow rates of 40 and 10 mL min−1 for analyte passage and elution steps, respectively, through the disks modified with 17.0 mg of EDTD. The proposed method also allows an enrichment factor of about 500 and has a detection limit of 0.005 ng mL−1. The method has been successfully applied for isolation and determination of copper in different water samples, peppers, and standard alloys.
authors.forename: Majid
authors.initials: M
authors.lastname: Mohammadhosseini
authors.forename: Esmaeil
authors.initials: E
authors.lastname: Soliemani
mesh_terms: D003300:Copper / Q000032:analysis* / Q000737:chemistry; D004784:Environmental Monitoring / Q000379:methods*; D012822:Silicon Dioxide; D052616:Solid Phase Extraction / Q000379:methods; D013054:Spectrophotometry, Atomic / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D014874:Water Pollutants, Chemical; C026679:octadecylsilica; D012822:Silicon Dioxide; D003300:Copper