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Determination of gold by anodic stripping voltammetry with carbon fiber ultramicroelectrodes
Author(s) -
AlarnesVarela Gabriel,
CostaGarcía Agustín
Publication year - 1997
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140091609
Subject(s) - stripping (fiber) , detection limit , anodic stripping voltammetry , analytical chemistry (journal) , chemistry , supporting electrolyte , calibration curve , electrochemistry , voltammetry , ultramicroelectrode , electrolyte , anode , selectivity , cyclic voltammetry , materials science , electrode , chromatography , biochemistry , composite material , catalysis
Carbon fiber ultramicroelectrodes have been used in anodic stripping voltammetry (ASV) of trace gold. The advantageous characteristics of ultramicroelectrodes combined with ASV resulted in a fast, selective, sensitive and reproducible method. An electrochemical pretreatment was necessary for analytical determinations. The combination of supporting electrolyte (HCl 0.1 M) and electrodeposition potential (0.0 V) gave a high selectivity. A calibration plot from 1.00 × 10 −8 M to 1.60 × 10 −6 M ( r = 0.9994) was achieved with a detection limit of 5.94 × 10 −9 M and a relative standard deviation (RSD) of 2.87% at 3.0 × 10 −7 M. Ag I , Cu II , Pb II and Hg II metals in the concentration of 1.00 × 10 −6 M were not found to interfere with the ASV of gold (3.00 × 10 −7 M) when carried out under optimum conditions. The procedure was applied to the determination of gold in two tap water synthetic samples.