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Desempenho do eletrodo de filme de paládio na determinação de tálio e chumbo em amostras de águas naturais por voltametria de redissolução anódica com pulso diferencial

2017; Brazilian Chemical Society; Linguagem: Inglês

10.21577/0100-4042.20170097

1678-7064

Jorge L. O. Santos, Oldair Donizeti Leite, Clayton Ricardo Janoni, Djane de Jesus, Ana Maria Pinto dos Santos,

Water Quality and Pollution Assessment

DIFFERENTIAL PULSE ANODIC STRIPPING VOLTAMMETRY.The use of a palladium film electrode (PdFE) as an alternative electrode for the determination of thallium (Tl + ) and lead (Pb 2+ ) in water samples by anodic stripping voltammetry is proposed.Preliminary studies of the influence of the substrate were performed on the electrochemical behavior of PdFE prepared ex situ.Using a silver solid amalgam electrode as substrate (AgSAE), the effect of several parameters such as potential and deposition time, composition and pH of supporting electrolyte on the analytical response of PdFE for Tl + by differential pulse anodic stripping voltammetry (DPASV) was initially investigated.Under best experimental conditions of deposition potential of -1.2 V and deposition time of 300s the analytical curve was linear in the Tl + concentration from 3.0 to 100.0 µg L -1 with a relative standard deviation (RSD) <2.0%.The limit of detection (LOD) and limit of quantification (LOQ) were 0.89 µg L -1 and 2.96 µg L -1 , respectively.The PdFE was successfully applied for the determination of Tl + in water samples.Moreover, this electrode showed promising as a sensor for the simultaneous determination of Tl + and Pb 2+ and as a suitable alternative to the mercury electrode.