Square-Wave Voltammetric Determination of Nanomolar Levels of Linuron in Environmental Water Samples Using a Glassy Carbon Electrode Modified with Platinum Nanoparticles within a Dihexadecyl Phosphate Film

Autor(es)

Marreto, Paola D. ^[1] ; Trench, Aline B. ^[1] ; Vicentini, Fernando C. ^[1] ; Figueiredo-Filho, Luiz C. S. ^[1] ; Medeiros, Roberta A. ^[2] ; Pereira, Ernesto. C. ^[1] ; Fatibello-Filho, Orlando ^{[1, 3]}

Afiliação do(s) autor(es)

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

^[2] Univ Oeste Parana, Ctr Engn & Ciencias Exatas, BR-85903000 Toledo, PR - Brazil

^[3] INCT Bioanalit, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: AUSTRALIAN JOURNAL OF CHEMISTRY; v. 68, n. 5, p. 800-805, 2015.
• Citações Web of Science: 2

Resumo

A new sensitive method for linuron determination using a glassy carbon electrode modified with platinum nanoparticles within a dihexadecyl phosphate film (PtNPs-DHP/GCE) and square-wave voltammetry was proposed. The PtNPs-DHP/GCE was characterised by scanning electron microscopy and the diameter of the Pt nanoparticles was between 13 and 34nm. The electrochemical behaviour of linuron was studied using cyclic voltammetry and an irreversible anodic peak was obtained at a potential of 1.2V in 0.1molL(-1) phosphate buffer (pH 3.0) solution. The analytical curve, obtained by square-wave voltammetry after accumulation, was linear in the linuron concentration range from 1.0 to 74.0nmolL(-1), with a detection limit of 0.61nmolL(-1). This sensitive analytical method was successfully applied for linuron determination in environmental water samples with results that showed good agreement with those obtained using a comparative HPLC method. (AU)

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