Square-Wave Adsorptive Cathodic Stripping Voltammeteric Determination of Manganese (II) Using a Carbon Paste Electrode Modified with Montmorillonite Clay

Amr M. Beltagi, Iqbal M. Ismail, Mohamed M. Ghoneim

Department of Chemistry, Faculty of Science, Kafr El-Sheikh University, Kafr El-Sheikh, Egypt.
Department of Chemistry, Faculty of Science, King Abdul Aziz University, Jeddah, Saudi Arabia.
Department of Chemistry, Faculty of Science, Tanta University, Tanta, Egypt.

DOI: 10.4236/ajac.2013.44025                

Abstract

Manganese is an essential micronutrient for all organisms; however at high concentrations it has a toxic effect. Manganese toxicity is a serious constraint to crop cultivation since it is taken-up by plants and can easily be passed into the food chain again causing symptoms of Parkinson’s disease. A fully validated square-wave adsorptive cathodic stripping voltammetry method has been developed for determination of Mn (II) as a complex with 2-(5’-bromo-2’-pyridylazo) 5-diethylaminophenol in aqueous solutions using a carbon paste electrode (CPE) modified with montmorillonite-Na clay. The results showed that the modified CPE (90% (w/w) graphite powder and 10% (w/w) montmorillonite-Na clay) exhibited excellent electrochemical activity towards the investigated Mn (II) complex in acetate buffer of pH = 5.0. Factors affecting the performance of the modified carbon paste electrode and the sensitivity of the described square- wave stripping voltammetry method, including the electrode composition, concentration of ligand, pulse parameters and preconcentration conditions were examined. A detection limit (S/N = 3) of 0.015μg·L^-1 (2.73 × 10^-10 mol·L^-1) Mn (II) was achieved when a preconcentration time of 240 s was applied. Insignificant interferences from various inorganic and organic species were estimated. The described square-wave adsorptive cathodic stripping voltammetry method coupled with the modified carbon paste electrode has been successfully applied to Mn (II) analysis in different water samples.

Keywords

Manganese; Stripping Voltammetry; Carbon Paste Electrode; Montmorillonite Clay

Conflicts of Interest

The authors declare no conflicts of interest.

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