title: Cathodic stripping voltammetric determination of arsenic in sugarcane brandy at a modified carbon nanotube paste electrode.
abstract: We have developed an eletroanalytical method that employs Cu(2+) solutions to determine arsenic in sugarcane brandy using an electrode consisting of carbon paste modified with carbon nanotubes (CNTPE) and polymeric resins. We used linear sweep (LSV) and differential-pulse (DPV) voltammetry with cathodic stripping for CNTPE containing mineral oil or silicone as binder. The analytical curves were linear from 30 to 110μgL(-1) and from 10 to 110μgL(-1) for LSV and DPV, respectively. The limits of detection (L.O.D.) and quantification (L.O.Q.) of CNTPE were 10.3 and 34.5μgL(-1) for mineral oil and 3.4 and 11.2μgL(-1) for silicone. We applied this method to determine arsenic in five commercial sugarcane brandy samples. The results agreed well with those obtained by hydride generation combined with atomic absorption spectrometry (HG AAS).
authors: Universidade Federal de Lavras - UFLA, 37200-000 Minas Gerais, Brazil.
authors: Meryene C
authors: MC
authors: Teixeira
authors: Universidade Federal de Lavras - UFLA, 37200-000 Minas Gerais, Brazil.
authors: Elisângela de F L
authors: Ede F
authors: Tavares
authors: Universidade Federal de Lavras - UFLA, 37200-000 Minas Gerais, Brazil. Electronic address: adelir@dqi.ufla.br.
authors: Adelir A
authors: AA
authors: Saczk
authors: Universidade Federal de Viçosa - UFV, 36570-000 Minas Gerais, Brazil.
authors: Leonardo L
authors: LL
authors: Okumura
authors: Universidade Federal de Lavras - UFLA, 37200-000 Minas Gerais, Brazil.
authors: Maria das Graças
authors: Md
authors: Cardoso
authors: Universidade Federal de Lavras - UFLA, 37200-000 Minas Gerais, Brazil.
authors: Zuy M
authors: ZM
authors: Magriotis
authors: Departamento de Química, FFCLRP, Universidade de São Paulo, 14040-901 São Paulo, Brazil.
authors: Marcelo F
authors: MF
authors: de Oliveira
mesh_terms: D000327:Adsorption; D000434:Alcoholic Beverages / Q000032:analysis*; D001151:Arsenic / Q000737:chemistry*; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D005506:Food Contamination / Q000032:analysis* / Q000517:prevention & control; D057230:Limit of Detection; D037742:Nanotubes, Carbon / Q000737:chemistry*; D031786:Saccharum / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D001151:Arsenic
keywords: Arsenic; Carbon paste electrode; Multi-walled carbon nanotubes; Sugarcane brandy