Abstract
A molecularly imprinted polymer (MIP) was synthesized via non-covalent, bulk, thermal radical polymerization using methacrylic acid (functional monomer), ethylene glycol dimethacrylate (cross-linker), 2,2′-azobisisobutironitril (initiator), acidic and basic lead salamthio complex (templates), and methanol (porogenic solvent). A control polymer (non-imprinted polymer, NIP) was prepared under well-defined conditions without the use of template for comparison. Acidic and basic MIP and NIP were subjected to extraction experiments. Various parameters, including pH, time, concentration of sample, and type of eluent for elution of lead from polymer, were optimized. In addition, the interfering effect of MIP on lead absorption was investigated. Results obtained for acidic, basic, and NIP showed that acidic lead salamthio complex has significantly better adsorption capacity and faster adsorption kinetic, and can elute lead more efficiently than basic lead salamthio MIP. The amount of lead was measured in the lipstick and tap water after preconcentration by the synthesized MIPs, and then compared with the results obtained using GFAAS. The proposed method showed high performance for preconcentration of lead.
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