title: On-site fuel electroanalysis: determination of lead, copper and mercury in fuel bioethanol by anodic stripping voltammetry using screen-printed gold electrodes.
abstract: The potential application of commercial screen-printed gold electrodes (SPGEs) for the trace determination of lead, copper, and mercury in fuel bioethanol is demonstrated. Samples were simply diluted in 0.067 mol L(-1) HCl solution prior to square-wave anodic stripping voltammetry (SWASV) measurements recorded with a portable potentiostat. The proposed method presented a low detection limit (<2 μg L(-1)) for a 240 s deposition time, linear range between 5 and 300 μg L(-1), and adequate recovery values (96-104%) for spiked samples. This analytical method shows great promise for on-site trace metal determination in fuel bioethanol once there is no requirement for sample treatment or electrode modification.
authors.affiliation: Instituto de Química, Universidade Federal de Uberlândia, Av. João Naves de Ávila, 2121, Uberlândia, MG, Brazil.
authors.forename: Eduardo S
authors.initials: ES
authors.lastname: Almeida
authors.affiliation: Instituto de Química, Universidade Federal de Uberlândia, Av. João Naves de Ávila, 2121, Uberlândia, MG, Brazil.
authors.forename: Eduardo M
authors.initials: EM
authors.lastname: Richter
authors.affiliation: Instituto de Química, Universidade Federal de Uberlândia, Av. João Naves de Ávila, 2121, Uberlândia, MG, Brazil. Electronic address: raamunoz@iqufu.ufu.br.
authors.forename: Rodrigo A A
authors.initials: RA
authors.lastname: Munoz
mesh_terms: D056804:Biofuels / Q000032:analysis*; D003300:Copper / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D000431:Ethanol / Q000737:chemistry; D005579:Fossil Fuels / Q000032:analysis*; D006046:Gold; D007854:Lead / Q000737:chemistry*; D008628:Mercury / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D056804:Biofuels; D005579:Fossil Fuels; D007854:Lead; D000431:Ethanol; D006046:Gold; D003300:Copper; D008628:Mercury
keywords: Disposable electrodes; Field determination; Fuel ethanol; Metals; Stripping analysis