title: Polyelectrolyte multilayers on magnetic silica as a new sorbent for the separation of trace copper in food samples and determination by flame atomic absorption spectrometry.
abstract: A novel magnetic silica sorbent with polyelectrolyte multilayers (PEMs) on its surface was prepared, and the sorbent was used for the magnetic solid phase extraction (MSPE) of trace Cu(2+) in drinking water with flame atomic absorption spectrometry (FAAS) as the detector. The experimental parameters for the MSPE procedure, such as the pH, desorption conditions, ultrasonic time and co-existing ions effects, were investigated. The adsorption capacity of the new sorbent was 14.7 mg g(-1) for Cu(2+). The detection limit of the developed method was 0.23 ng mL(-1) for Cu(2+) with an enrichment factor of 95.7. The analytical data obtained from the certified reference water and rice samples were in good agreement with the certified values. This method was also successfully applied to the determination of trace Cu(2+) in different food samples with satisfactory results.
authors.affiliation: School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China. Electronic address: xianggq@haut.edu.cn.
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Xiang
authors.affiliation: School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China.
authors.forename: Yulong
authors.initials: Y
authors.lastname: Ma
authors.affiliation: School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China.
authors.forename: Xiuming
authors.initials: X
authors.lastname: Jiang
authors.affiliation: School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China.
authors.forename: Pu
authors.initials: P
authors.lastname: Mao
mesh_terms: D000327:Adsorption; D003300:Copper / Q000032:analysis*; D004573:Electrolytes / Q000737:chemistry*; D005504:Food Analysis / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D008280:Magnetics; D012822:Silicon Dioxide / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000379:methods; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D004573:Electrolytes; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide; D003300:Copper
keywords: Copper; Drinking water; FAAS; Magnetic solid phase extraction; Polyelectrolyte multilayers