Solid phase selective separation and preconcentration of Cu(II) by Cu(II)-imprinted polymethacrylic microbeads.
Ion-imprinted polymer (IIP) particles are prepared by copolymerization of methacrylic acid as monomer, trimethylolpropane trimethacrylate as crosslinking agent and 2,2'-azo-bis-isobutyronitrile as initiator in the presence of Cu(II), a Cu(II)-4-(2-pyridylazo)resorcinol (Cu(II)-PAR) complex, and PAR only. A batch procedure is used for the determination of the characteristics of the Cu(II) solid phase extraction from the IIP produced. The results obtained show that the Cu(II)-PAR IIP has the greatest adsorption capacity (37.4 micromol g(-1) of dry copolymer) among the IIPs investigated. The optimal pH value for the quantitative preconcentration is 7, and full desorption is achieved by 1 M HNO(3). The selectivity coefficients (S(Cu/Me)) for Me=Ni(II), Co(II) are 45.0 and 38.5, respectively. It is established that Cu(II)-PAR IIPs can be used repeatedly without a considerable adsorption capacity loss. The determination of Cu(II) ions in seawater shows that the interfering matrix does not influence the preconcentration and selectivity values of the Cu(II)-PAR IIPs. The detection and quantification limits are 0.001 micromol L(-1) (3sigma) and 0.003 micromol L(-1) (6sigma), respectively.
Dakova
Ivanka
I
Department of Chemistry, Sofia University, Sofia, Bulgaria. i.dakova@chem.uni-sofia.bg <i.dakova@chem.uni-sofia.bg>
Karadjova
Irina
I
Ivanov
Ivo
I
Georgieva
Ventsislava
V
Evtimova
Bisera
B
Georgiev
George
G
D003300:Copper / Q000032:analysis / Q000302:isolation & purification*; D004563:Electrochemistry / Q000379:methods; D007202:Indicators and Reagents; D008689:Methacrylates; D008832:Microchemistry / Q000379:methods; D011109:Polymethacrylic Acids / Q000032:analysis / Q000302:isolation & purification*; D012623:Seawater / Q000032:analysis*; D013054:Spectrophotometry, Atomic / Q000379:methods; D013816:Thermodynamics
D007202:Indicators and Reagents; D008689:Methacrylates; D011109:Polymethacrylic Acids; C008384:methacrylic acid; C030613:polymethacrylic acid; D003300:Copper