JOURNAL OF CHILEAN CHEMICAL SOCIETY

Vol 62 No 4 (2017): Journal of the Chilean Chemical Society
Original Research Papers

ANODIC STRIPPING VOLTAMMETRIC DETERMINATION OF LEAD USING A CHEMICALLY MODIFIED ELECTRODE BASED ON AZA CROWN ETHER

Rodrigo Segura
Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile (USACH)
Karina Díaz
Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile (USACH)
Jaime Pizarro
Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile (USACH)
Alan Placencio
Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile (USACH)
Diego Tapia
Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile (USACH)
Ángelo Fajardo
Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile (USACH)
Published February 9, 2018
Keywords
  • Aza crown ether,
  • anodic stripping voltammetry,
  • lead
How to Cite
Segura, R., Díaz, K., Pizarro, J., Placencio, A., Tapia, D., & Fajardo, Ángelo. (2018). ANODIC STRIPPING VOLTAMMETRIC DETERMINATION OF LEAD USING A CHEMICALLY MODIFIED ELECTRODE BASED ON AZA CROWN ETHER. Journal of the Chilean Chemical Society, 62(4). Retrieved from https://www.jcchems.com/index.php/JCCHEMS/article/view/466

Abstract

A glassy carbon electrode was modified by drop-coating technique using 1,4,10,13-Tetraoxa-7,16-diazaciclooctadecano (diaza-18 -crown-6 or DA18C6) and Nafion (NF) for the determination of Pb (II) by square wave anodic stripping voltammetric (SWASV). The new electrode exhibits an increase in due to major pre-concentration of aza crown ether and ionic exchange of NF with metal cations. Optimal conditions were: 3 mmol L-1 DA18C6, 3 wt % NF, 10 mmol L-1 HCl as supporting electrolyte, a frequency of 15 Hz , an accumulation time of 300 s and an accumulation potential of -0.80 V. The detection limit was 0.09 μg L-1 and linear range was 10-50 μg L-1. Interference from metal ions such us Fe (II), Pb (II), Cd (II) and Cu (II) was also studied. The method is sensitive, selective and simple with a relative standard deviation of 11%.

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