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Nanoscale ZrO2 was synthesized on a multiwall carbon  nanotube (MWCNT) and designed as a new solid phase extractor for metal  ion preconcentration.  The characterization of the synthesized  material was achieved by transmission electron microscope (TEM) and  X-ray diffraction (XRD).  Then the new nanoscale material was applied  to preconcentration of lead(II) from various matrices.  Different  experimental factors including pH of the sample solution, sample  volume, flow rate of the sample solution, and volume and concentration  of the eluent for the preconcentration step were examined.  The effect  of interfering ions on the recovery of the lead(II) was also  investigated.  The recovery of lead(II) under the optimum conditions  was found to be 104 \pm 2% at 95% confidence level.  The  preconcentration factor was 30 when 150 mL of sample solution and 5 mL  of eluent were used.  The analytical detection limit for Pb(II) was  0.80 m g L-1 after preconcentration.  The adsorption capacity of  the new nanosorbent was 115 mg g-1.  The accuracy of the method was  confirmed by analyzing standard reference materials (Silty Clay 7003).  The results demonstrated good agreement with the certified values.  The method was applied for the determination of lead in tap water and  clay samples.

Growth traits and survival rates of Akkaraman lambs in breeder flocks in Konya Province