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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 %.

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Correspondence to Mohammad Reza Nateghi.

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Shahi, S., Nateghi, M.R. Double Preconcentration of Trace Amounts of Cadmium in Nail Samples and Measurement by Differential Pulse Voltammetry. Bull Environ Contam Toxicol 94, 468–473 (2015). https://doi.org/10.1007/s00128-015-1484-x

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Keywords

  • Cadion
  • Cadmium
  • Solid phase extraction
  • Stripping voltammetry