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Stripping Voltammetry of Pb(II), Cu(II), and Hg(II) at a Nafion‐Coated Glassy Carbon Electrode Modified by Neutral Ionophores
Author(s) -
Chen Zuliang,
Pourabedi Zahra,
Hibbert D. B.
Publication year - 1999
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/(sici)1521-4109(199909)11:13<964::aid-elan964>3.0.co;2-3
Subject(s) - anodic stripping voltammetry , nafion , stripping (fiber) , electrode , voltammetry , supporting electrolyte , chemistry , analytical chemistry (journal) , saturated calomel electrode , detection limit , glassy carbon , reference electrode , cyclic voltammetry , inorganic chemistry , electrolyte , materials science , electrochemistry , chromatography , composite material
The analysis of Pb 2+ , Cu 2+ and Hg 2+ by stripping voltammetry using a Nafion‐coated glassy carbon electrode modified with diethyldithiocarbamic acid (DDTC) or 1,4,7,10,13,16‐hexaoxacyclooctadecane(18‐crown‐6) is described. Metal ions were accumulated at the electrode by complexing with the ionophore, reduction and detected by differential pulse anodic stripping voltammetry. A five‐fold increase in the voltammetric response was achieved at the modified electrode compared to a bare glassy electrode. Parameters and conditions such as the modifier composition, the pH of supporting electrolyte, deposition potential, deposition time, and stripping mode were optimized. For five minutes preconcentration at DDTC in 100 mM KNO 3 , pH 2.5, linear calibration plots in the range 0.5 μM to 50 μM were obtained with a detection limit of 10 nM. For 18‐crown‐6, after accumulation at open circuit for 1 minute, a linear plot between 2 and 40 μM was achieved. The lifetimes of each electrode were more than three weeks.