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Electrochemical liquid-phase microextraction and determination of iodide in kelp based on a carbon paste electrode by cyclic voltammetry

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Abstract

We describe the coupling of liquid-phase microextraction (LPME) with cyclic voltammetry for the determination of iodine in kelp based on a carbon paste electrode with a mixture of castor oil and ethyl benzoate as the organic binder and extracting agent. The iodide was quickly adsorbed on the micro-liquid membrane covering a graphite powder surface without the influence of an applied potential. The extraction follows a Freundlich adsorption isotherm. The oxidation peak current was proportional to the exponential function of iodide concentration in the range from 10 to 400 μM. The method is sensitive, selective, simple, convenient, not interfered by chloride or bromide, and was applied to the determination of iodide in kelp with a recovery of 99.0–119.7%.

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Acknowledgements

The author would like to acknowledge the financial support of the Chinese National Science Foundation (20875063), Liaoning Minister of Education (2004-c022) and the national key laboratory of electroanalytical chemistry (2006–06), Shenyang Sciences and the technology bureau foundation (2007-GX-32).

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Authors and Affiliations

  1. Key University Laboratory on Separation and Analysis in Complex Systems of Liaoning Province, Chemistry Department, College of Chemistry and Life Science, Shenyang Normal University, 110034, Shenyang, Liaoning, People’s Republic of China

    Yongchun Zhu, Lu Cao, Jie Hao, Qian Qu, Shigang Xin & Hongbo Zhang

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  1. Yongchun Zhu
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  2. Lu Cao
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  3. Jie Hao
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  4. Qian Qu
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  5. Shigang Xin
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  6. Hongbo Zhang
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Correspondence to Yongchun Zhu.

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Zhu, Y., Cao, L., Hao, J. et al. Electrochemical liquid-phase microextraction and determination of iodide in kelp based on a carbon paste electrode by cyclic voltammetry. Microchim Acta 170, 121–126 (2010). https://doi.org/10.1007/s00604-010-0397-y

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