Anodic stripping voltammetric determination of copper(II) using a functionalized carbon nanotubes paste electrode modified with crosslinked chitosan

Autor(es)

Janegitz, Bruno C. ^[1] ; Marcolino-Junior, Luiz H. ^[2] ; Campana-Filho, Sergio P. ^[3] ; Faria, Ronaldo C. ^[1] ; Fatibello-Filho, Orlando ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, Ctr Ciencias Exatas & Tecnol, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Fed Parana, Dept Quim, BR-80060000 Curitiba, PR - Brazil

^[3] Univ Sao Paulo, Inst Quim Sao Carlos, BR-05508 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SENSORS AND ACTUATORS B-CHEMICAL; v. 142, n. 1, p. 260-266, OCT 12 2009.
• Citações Web of Science: 119

Resumo

The development and application of a functionalized carbon nanotubes paste electrode (CNPE) modified with crosslinked chitosan for determination of Cu(II) in industrial wastewater, natural water and human urine samples by linear scan anodic stripping voltammetry (LSASV) are described. Different electrodes were constructed using chitosan and chitosan crosslinked with glutaraldehyde (CTS-GA) and epichlorohydrin (CTS-ECH). The best voltammetric response for Cu(II) was obtained with a paste composition of 65% (m/m) of functionalized carbon nanotubes, 15% (m/m) of CTS-ECH, and 20% (m/m) of mineral oil using a solution of 0.05 mol L(-1) KNO(3) with pH adjusted to 2.25 with HNO(3), an accumulation potential of 0.3V vs. Ag/AgCl (3.0 mol L(-1) KCl) for 300 s and a scan rate of 100 mV s(-1). Under these optimal experimental conditions, the voltammetric response was linearly dependent on the Cu(II) concentration in the range from 7.90 x 10(-8) to 1.60 x 10(-5) mol L(-1) with a detection limit of 1.00 x 10(-8) mol L(-1). The samples analyses were evaluated using the proposed sensor and a good recovery of Cu(II) was obtained with results in the range from 98.0% to 104%. The analysis of industrial wastewater, natural water and human urine samples obtained using the proposed CNPE modified with CTS-ECH electrode and those obtained using a comparative method are in agreement at the 95% confidence level. (C) 2009 Elsevier B. V. All rights reserved. (AU)

• Processo FAPESP: 06/05146-0 - Desenvolvimento de sensores utilizando nanotubos de carbono ou pó de grafite modificados com quitosana reticulada para a determinação de íons metálicos de alta toxicidade em águas residuárias
• Beneficiário: Bruno Campos Janegitz
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 07/08365-7 - Desenvolvimento, caracterização e aplicação analítica de eletrodos modificados com nanotubos de carbono e quitosana reticulada
• Beneficiário: Ronaldo Censi Faria
• Modalidade de apoio: Auxílio à Pesquisa - Regular