Evaluation of a carbon paste electrode modified with Ionic liquid and MnO nanoparticles in the Cu(II)determination by Potentiometric Method

A chemically modified carbon paste electrode with ionic liquid and MnO nanoparticles was prepared and used as a sensor for Cu2+ ion. Theionic liquid and MnO nanoparticles were used in the composition of the carbon paste to improve conductivity and transduction of chemical signal to electrical signal. Moreover, incorporation of N,N',N"- Tricyclohexil phosphoric triamid as an ionophore to this composition caused to significantly enhanced selectivity toward Cu (II) ions. The electrode exhibit a super Nernstian slope of 29.9 ±0.25 mV per decade for Cu2+ ion over a wide concentration range from 1.0×10-1to 1.0×10-6M.The lower detection limits are 3.2×10 -7 M. The electrode has a fast response time (<6 s), a satisfactory reproducibility and relatively long life time. The proposed sensor shows a fairly good selectivity toward Cu2+ ion in comparison to other common cations and the working pH range was 4.0- 11. Finally, these electrode have been successfully applied for the determination of Cu2+ ions content in various real samples.

Keywords: copper, Carbon paste electrode, Ionic liquid, Potentiometric, Mnonanopartcles

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