title: Double preconcentration of trace amounts of cadmium in nail samples and measurement by differential pulse voltammetry.
abstract: Cadion was coated on carbon powder and used as a solid phase for selective extraction and preconcentration of cadmium ions. Complexed cadmium ions were eluted from solid phase by 5 mL, nitric acid (2.0 M) with the flow rate of 2 mL min(-1).The resulted solution was used for accumulation of the cadmium metal at the surface of the carbon paste electrode at -1.3 V reduction potential. Finally, cadmium was reoxidized and the differential pulse voltammogram recorded at the potential range of -0.55 to -0.2 V. Calibration graph was plotted in the concentration range of 0.5-50 μg L(-1) of cadmium. Detection limit 0.06 μg L(-1) was calculated based on the 3 Sb/m. The RSD was 9.13 % (n = 4) for cadmium concentration of 10 μg L(-1) with preconcentration factor of 100. Method was successfully used for the determination of cadmium in finger nail samples and after spiking the samples, the recoveries were evaluated >96 %.
authors: Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran.
authors: Somayeh
authors: S
authors: Shahi
authors: Mohammad Reza
authors: MR
authors: Nateghi
mesh_terms: D002104:Cadmium / Q000032:analysis* / Q000302:isolation & purification; D002138:Calibration; D002244:Carbon / Q000737:chemistry; D004566:Electrodes; D006801:Humans; D057230:Limit of Detection; D009262:Nails / Q000737:chemistry*; D052616:Solid Phase Extraction
chemical_list: D002104:Cadmium; D002244:Carbon