Anodic Stripping Voltammetric Determination of Nitrite Using Carbon Paste Electrode Modified with Chitosan
Ibrahim H. I. Habib
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DOI: 10.4236/ajac.2011.22035   PDF    HTML     6,977 Downloads   12,458 Views   Citations

Abstract

A simple method for anodic stripping voltammetric determination of nitrite using carbon paste electrode modified with biomolecular chitosan, is described. In this method, the electrode is activated electrochemically by scanning 5 replicates over the potential range from +500 to +1400 mV immersing in 0.5 M HCl solution. Following this step, the nitrite sample containing 0.1 M KCl is preconcentrated on the activated electrode at +500 mV for 30 s. The deposited anions are then oxidized by different modes of sweep in the oxidation direction. Chemical and electrical parameters affecting the voltammetric measurements are optimized. The peak current is linear proportional to the NO2- concentration within the range 0.41 - 4.1 µg/ml, with detection limit 0.187 µg/m using differential pulse mode. The relative standard deviation is 0.285% for 2.46 µg/ml (five replicates). No interference is observed due to oxygen dissolved in the sample so that nitrogen purging is not needed in this case. The result obtained by the modified electrode is more accurate and selective than the unmodified electrode.

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I. Habib, "Anodic Stripping Voltammetric Determination of Nitrite Using Carbon Paste Electrode Modified with Chitosan," American Journal of Analytical Chemistry, Vol. 2 No. 2, 2011, pp. 284-288. doi: 10.4236/ajac.2011.22035.

Conflicts of Interest

The authors declare no conflicts of interest.

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