Article citationsMore>>

R. G. O. Araujo, F. S. Dias, S. M. Macedo, W. N. L. dos Santos and S. L. C. Ferreira, “Method Development for the Determination of Manganese in Wheat Flour by Slurry Sampling Flame Atomic Absorption Spectrometry,” Food Chemistry, Vol. 101, No. 1, 2007, pp. 397-400. doi:10.1016/j.foodchem.2005.10.024

has been cited by the following article:

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

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

  KEYWORDS: Manganese; Stripping Voltammetry; Carbon Paste Electrode; Montmorillonite Clay

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.4 No.4, April 29, 2013

  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.