Glassy carbon electrodes coated with poly(allylamine hydrochloride), PAH: Characterization studies and application to ion-exchange voltammetry of trace lead(II) at combined PAH/mercury film electrodes

2006 ◽  
Vol 52 (3) ◽  
pp. 1182-1190 ◽  
Author(s):  
Carla Patrícia Silva ◽  
Helena M. Carapuça
Keyword(s):  
Ion Exchange ◽  
Glassy Carbon ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Mercury Film ◽  
Characterization Studies ◽  
Allylamine Hydrochloride

Nafion-coated mercury-coated glassy carbon electrodes for metals analysis and speciation

1987 ◽  
Vol 65 (5) ◽  
pp. 1133-1138 ◽  
Author(s):  
Robert D. Guy ◽  
Sarath Namaratne
Keyword(s):  
Ionic Strength ◽  
Ion Exchange ◽  
Differential Pulse Voltammetry ◽  
Glassy Carbon ◽  
Metal Ion ◽  
Differential Pulse ◽  
Carbon Electrodes ◽  
Linear Calibration ◽  
Glassy Carbon Electrodes ◽  
Pulse Voltammetry

The properties of mercury-coated glassy carbon electrodes coated with a thin membrane of Nation 117 were studied to evaluate the potential analytical applications in metal ion analysis. The Nation membrane was found to contain two types of binding sites — a strong site that bound metal ions in a nonelectroactive form and cation exchange sites that were useful for preconcentrations prior to differential pulse voltammetry. The exchange constants for the weak sites ranged from 0.413 for copper to 12.5 for methyl viologen. The differential pulse currents were increased by a factor of 75 to 100 and a linear calibration curve was observed from about 25 n M to 1000 n M for copper, lead, cadmium, and zinc. The ion exchange reaction is very sensitive to ionic strength and significant enrichments occur only in solutions of ionic strength below 0.10. The Nafion-coated glassy carbon electrode in a flow cell can be used to determine the free copper ion concentration in samples by a combination of ion exchange and differential pulse voltammetry. The flow-through system required about 15 mL of sample solution and an analysis time of about 10 min. The ion exchange measurement gave a linear calibration from 40 n M to 10 μ M for free copper.

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