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APPLICATION OF BARE AND SILICA- COATED MnFe 2 O 4 MAGNETIC NANOPARTICLES AS A SORBENT FOR SOLID PHASE EXTRACTION AND ICP-OES TRACE ELEMENTS DETERMINATION

Magnetic nanosized sorbent material based on MnFe 2 O 4 (MnNPs) was synthesized by co-precipitation. Silica coated nanoparticles (SMnNPs) were obtained and both types coated and non-coated nanoparticles were tested for solid phase exstraction of V, Co, Cr, Ni, Cu, Zn, Pb and Cd complexes with ammonium pyrrolidine dithiocarbamate (APDC). The analytes restoration into the fi nal solution was achieved by treatment with 7 mol L-1 nitric acid at 25 o C. The elution of elements for 10 min from