SciELO - Scientific Electronic Library Online

vol.21 número1The Influence of Metallic Oxides Formed by Repetitive Cyclic Voltammetry or Controlled Potential in the Reactivity of Ir/Hg SystemElectrochemical Study of Alkynyl Fe(II) Complexes índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados




Links relacionados

  • Não possue artigos similaresSimilares em SciELO


Portugaliae Electrochimica Acta

versão impressa ISSN 0872-1904

Port. Electrochim. Acta v.21 n.1 Coimbra  2003


Electroanalysis of Heavy Metals in the Cork of Quercus Suber Tree. Preliminary Study: Electroanaliticity of Pb(II)

J.C.A.C. Ponte e Sousaa)*, J.M. Ginja Teixeiraa), A.M. Neto Vaza),b)

a) Departamento de Química, Universidade de Évora. R. Romão Ramalho, 59, 7000-671 Évora.

b)CECUL Fundação da Faculdade de Ciências da Universidade de Lisboa. Edifício C8, R. Ernesto de Vasconcelos, 1749-016 Lisboa

Received 15 November 2002; accepted in revised form 09 January 2003



This will enable Pb(II) determination optimisation, regarding environmental aspects of the perpetuation of Quercus suber Montado (similar to Forest). It will also allow a more profound toxicological quality control of corks (barks). These two last referred aspects are very related ones, once accepted that the more advanced could the certification of the quality patterns of corks (barks) be, more will be the sustainability of Quercus suber ecosystem. Which we believe can be done, amongst other vectors, by studying such an important environmental issue as heavy metals. It is shown that Pb(II) quantification in the cork (bark) of Quercus suber tree (Cork Oak) is possible, using Differential Pulse Anodic Stripping Voltammetry (DPASV). The samples digestion was made in a mixture of H2O2 and HNO3 1:8, in a closed recipient at approximately 90 ºC. The measures were made in NaCl 0.1 M, using a Hanging Mercury Drop Electrode, a Glassy-Carbon Rod Counter Electrode, and an Ag/AgCl/KCl 3M reference electrode, after a 180 s deposition step. The results have shown the determination of a coherent stripping potential of -0.405 V (SD=0.0005 V), and a fine linear adjustment after the standard addition method (R2 = 0.997). They have also revealed the interest of further studies. The need to test other electroanalysis requisites was understood, and imposed by the proof of the complex nature of the matrix.

Keywords: cork (bark), Quercus suber tree (cork oak), Pb(II), Differential Pulse Anodic Stripping Voltammetry (DPASV), environment


Texto completo disponível apenas em PDF.

Full text only in PDF format.



1. M.E. Soares, M.A. Borges, M.L. Bastos, M.A. Ferreira, Ciência Téc. Vitiv. 11 (1994) 87-99.        [ Links ]

2. L. Gil, Cortiça, Produção, Tecnologia e Aplicação, INETI, Lisboa. 1998. p. 254.        [ Links ]

3. M.E. Soares, M.L. Bastos, M.A. Ferreira, J. Anal. At. Spectrom. 8 (1993) 655-657.        [ Links ]

4. M.A. Ferreira, M.E. Soares, M.L. Bastos, J.M. Leal Ferreira, CTCOR Magazine 1 (1996) 48-57.        [ Links ]

5.        [ Links ]

6. D.T. Sawyer, J.L. Roberts, Electrochemistry for Chemists, John Wiley and Sons. 1974. p. 369.        [ Links ]

7. A.M. Bond, Modern Polarographic Methods in Analytical Chemistry, Marcel Dekker Inc. 1980. pp. 456-457.        [ Links ]

* Corresponding author. E-mail address:,


Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons