title: Solid-phase extraction and preconcentration of copper in mineral waters with 4-(2-pyridyl-azo) resorcinol-loaded amberlite XAD-7 and flame atomic absorption spectrometry.
abstract: A simple, sensitive, accurate, and selective method for determination of ultratrace levels of copper is modified. The method is based on preconcentration of copper on the 4-(2-pyridyl-azo) resorcinol-loaded amberlite XAD-7 (non-ionic copoly[styrene-acrylic compound]) at pH 5.0 to 6.5 for contact time as low as 45 minutes. The adsorbed copper was eluted with concentrated nitric acid and measured by flame atomic absorption spectrometry. Recoveries of up to 90% were achieved. The optimized preconcentration method was applied to copper determination in various water samples. The detection limit was found to be 0.09 ng mL(-1). The relative standard deviation was found to be 9% using 300 mL of 5.0 ng mL(-1) for 10 replicate preconcentration procedures. Copper concentrations in the studied water samples were found to be in the ranges of 0.4 to 18.0 ng mL(-1).
authors.affiliation: Science and Art Faculty, Department of Chemistry, Firat University, Elazig, Turkey.
authors.forename: Muharrem
authors.initials: M
authors.lastname: Ince
authors.forename: Olcay
authors.initials: O
authors.lastname: Kaplan
authors.forename: Mehmet
authors.initials: M
authors.lastname: Yaman
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000327:Adsorption; D003300:Copper / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D008900:Mineral Waters / Q000032:analysis*; D011137:Polystyrenes / Q000737:chemistry*; D012118:Resorcinols / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000379:methods*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D000180:Acrylic Resins; D008900:Mineral Waters; D011137:Polystyrenes; D012118:Resorcinols; D014874:Water Pollutants, Chemical; C015661:amberlite XAD 7; D003300:Copper; C028398:4-(2-pyridylazo)resorcinol