Studies on Uncommon Response for Cu2+by Potentiometry of Carbon Paste Electrode

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (8): 1207.

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Studies on Uncommon Response for Cu²⁺by Potentiometry of Carbon Paste Electrode

HU Xiao-Ya, LENG Zong-Zhou

Department of Chemistry and Chemical Engineering, Teachers College, Yangzhou University, 225002

Received:1994-11-05 Revised:1995-03-10 Online:1995-08-24 Published:1995-08-24

Abstract

Abstract: This paper describes a potentiometric method for the determination of Cu²⁺in 0.1 mol/L HAc-NaAc-0.05 mol/L NaCl buffer(pH5.00)using a carbon paste electrode(without ionophore,mixing paraffin liquid and spectroscopic graphite powder at a ratio of 1.5:1W/ W).The linear range is 2.5 ×10^-6～1.0×10^-3mol/Lwith 49 mV/decade of calibration slope. It exhibits a high selectivity and a desired reproducibility. The potential response behavior is caused by carbon paste extraction(or adsorption) of the matter being measured and the redox potential mechanism.

Key words: Potentiometry, Carbon paste electrode, Copper ion, Copper-selectivity

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HU Xiao-Ya, LENG Zong-Zhou. Studies on Uncommon Response for Cu²⁺by Potentiometry of Carbon Paste Electrode[J]. Chem. J. Chinese Universities, 1995, 16(8): 1207.

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Studies on Uncommon Response for Cu²⁺by Potentiometry of Carbon Paste Electrode

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