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Electrochemical behavior of methyl parathion and its sensitive determination at a glassy carbon electrode modified with ordered mesoporous carbon

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Abstract

Ordered mesoporous carbon (OMC) was synthesized and used to modify the surface of a glassy carbon (GC) electrode. Due to the unique properties of OMC, a decrease in the overvoltage of the reduction potential of methyl parathion (MP) (to ca. 219 mV) and a 76-fold increase in the peak current are observed (compared with a bare GC electrode). The absorption capacity of the surface of the electrode for MP was determined by chronocoulometry. The results show that the Г value of the modified electrode (2.34 × 10–9 mol cm–2) is 9.5 times as large as that of the GC electrode (2.47 × 10–10 mol cm–2). The new electrode exhibits synergistic electrocatalytic and accumulative effects on MP. MP can be determined by linear sweep voltammetry (LSV) which displays a linear relationship between peak current and MP concentration in the range from 0.09 to 61 μM, with a detection limit as low as 7.6 nM (at an S/N of 3) and after an accumulation at 0 V for 5 min. The electrode was successfully applied to the determination of MP in spiked lake water samples.

A glassy carbon (GC) electrode modified with ordered mesoporous carbon (OMC) performed an enhanced electrocatalytic activity and accumulative effect towards methyl parathion (MP). The electrode also exhibited wider linear range, lower detection limit, better electrochemical stability and utilization for MP determination.

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Acknowledgements

The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (No. 20875012).

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Authors and Affiliations

  1. Faculty of Chemistry, Northeast Normal University, Changchun, 130024, People’s Republic of China

    Deng Pan, Xiangjie Bo & Liping Guo

  2. Jilin Entry-Exit Inspection and Quarantine Bureau, Changchun, 130062, People’s Republic of China

    Shumin Ma

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  1. Deng Pan
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  2. Shumin Ma
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  3. Xiangjie Bo
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  4. Liping Guo
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Corresponding author

Correspondence to Liping Guo.

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Table S1

Comparison of linear range, detection limit of MP at different electrodes (DOC 33 kb)

Fig. S1

(a) The relationship between the peak currents and scan rates ranging from 10 to 130 mV·s–1. (b) The relationship between the peak currents and the square root of scan rates ranging from 140 to 600 mV·s–1 (DOC 55 kb)

Fig. S2

The plots of the peak potential E pa versus solution (0.1M phosphate buffer solution) pH. Scan rate: 100 mV·s–1. Inset figure shows the comparison of three different types of buffer solutions: phosphate buffer solution (a), acetate buffer solution (b) and B-R buffer solution (c) (DOC 43 kb)

Fig. S3

The effect of accumulation time on the peak current intensity of MP voltammograms (0.1 M phosphate buffer solution pH 6.0, other variables are same as those in Fig. 2) (DOC 37 kb)

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Pan, D., Ma, S., Bo, X. et al. Electrochemical behavior of methyl parathion and its sensitive determination at a glassy carbon electrode modified with ordered mesoporous carbon. Microchim Acta 173, 215–221 (2011). https://doi.org/10.1007/s00604-011-0551-1

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  • DOI: https://doi.org/10.1007/s00604-011-0551-1

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