Simultaneous determination of lead and cadmium by stripping voltammetry using in-situ mercury film glassy carbon electrode coated with nafion-macrocyclic ester

Jesid Lara, Juan F. Torres, Olimpo García Beltrán, Edgar Nagles, John Hurtado

Resultado de la investigación: Contribución a una revistaArtículo

7 Citas (Scopus)

Resumen

This work report a sensitive and selective anodic stripping method for the simultaneous determination of Pb(II) and Cd(II) using (3,10,18,25-tetraoxapentacyclo [25.3.1.1 12,16 .0 4,9 .0 19,24 ] dotriaconta1(31),4(9),5,7,12(32),13,15,19,21,23,27,29-dodecaene-2,11,17,26-tetrone) macrocyclic ester (L). Anodic peak currents were increased from 1.16 to 31.48 μA for Pb(II) and 0.22 to 6.68 μA for Cd(II) when the in-situ mercury film electrode was modified with nafion and (L). Moreover, potentials separation values for Cd-Pb shift from 150 to 190 mV. Optimal parameters such as: pH; L concentration (C L ), mercury concentration (C Hg ), accumulation potential (E ACC ) and accumulation time (t ACC ) were pH 4.0 for Pb(II) and 5.0 for Cd(II) using phosphate buffer solution (PBS), CL 12.0 mmol L -1 , C Hg 28.0 mg L -1 , E ACC -1 .0 V and tACC 60. Detection limits (DoL) were 0.085 and 0.80 μg L -1 for Pb(II) and Cd(II) respectively. The relative standard deviation (RSD) for seven measurements of Pb(II) and Cd(II) 9.0 μg L -1 were of 2.5 and 2.0% respectively. The method was validated by ICP multi-element standard solution IX (Merck) containing As, Be, Cd, Cr(VI), Hg, Ni, Pb, Se and Tl 100 mg L -1 . Finally, useful of the modified electrode was developed in the analysis of Pb(II) and Cd(II) using tap water samples.

Idioma originalInglés
Páginas (desde-hasta)6920-6929
Número de páginas10
PublicaciónInternational Journal of Electrochemical Science
Volumen12
N.º8
DOI
EstadoPublicada - 1 ago 2017

Palabras clave

  • Cadmium
  • Lead
  • Macrocyclic ester
  • Modified electrode
  • Stripping voltammetry

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