Abstract
A simple carbon paste electrode modified with nano cellulosic fibers was developed for stripping voltammetric determination of mercury in aqueous solution. Prepared electrode was characterized using cyclic voltammetry and electrochemical impedance spectroscopy. Differential pulse stripping voltammetry in anodic direction was used for quantification of mercury. Experimental and instrumental parameters affecting the voltammetric measurements are optimized i.e. 0.1 M NaOH as supporting electrolyte, 1 mM acetate buffer of pH 3 as accumulating solvent with 10 min accumulation time. The peak current is proportional to the mercury concentration in a range 300–700 ng/ml, with a detection limit of 97 ng/ml. The relative standard deviation is 1.1 % for 400 ng/ml (five replicates). The proposed method was also applied to the determination of mercury in the presence of CTAB, SDS, Triton X-100 as a representative of cationic, anionic and neutral surfactants. The interference study shows that no effect up to 50-fold excess of cadmium, 25-fold of nickel, 100-fold of zinc and fivefold of copper is observed. The results obtained from the modified electrode are more accurate with lower standard deviation than the unmodified electrode.
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Acknowledgments
The authors gratefully acknowledge Prof. V.G. Das, Director, Prof. L.D. Khemani, Head, Department of Chemistry, Dayalbagh Educational Institute, Dayalbagh, Agra, for providing necessary research facilities. The authors also gratefully acknowledge Ministry of Human Resource and Development, New Delhi for rendering financial assistance.
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Rajawat, D.S., Kardam, A., Srivastava, S. et al. Adsorptive Stripping Voltammetric Technique for Monitoring of Mercury Ions in Aqueous Solution Using Nano Cellulosic Fibers Modified Carbon Paste Electrode. Natl. Acad. Sci. Lett. 36, 181–189 (2013). https://doi.org/10.1007/s40009-013-0116-4
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DOI: https://doi.org/10.1007/s40009-013-0116-4