Journal
ANALYST
Volume 137, Issue 11, Pages 2629-2636Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2an35338e
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Funding
- National Natural Science Foundation of China [21175044]
- Programs of the Science & Technology Commission of Shanghai Municipality [10JC1404000, 10JC1411200]
- Doctoral Program of Higher Education [20100076110002]
- Sony Corporation of Japan
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A novel composite of vinyl group functionalized multiwalled carbon nanotubes (MWCNTs) molecularly imprinted polymer (MIP) was synthesized and applied as a molecular recognition element to construct an electrochemical sensor for parathion-methyl in this paper. The special molecular recognition properties of parathion-methyl mainly dominated by pi-pi, p-pi interaction and hydrogen bonding formed among functional monomer, template and matrix. A series of electrochemical experiment results proved that the prepared material had good adsorption capacity and fast mass transfer rate to parathion-methyl. The good selectivity of the sensor allowed fine discrimination between parathion and paraoxon, which had similar structures to parathion-methyl. The response of the MIPs was linearly proportional to the concentration of parathion-methyl over the range of 2.0 x 10(-7) to 1.0 x 10(-5) mol L-1 with a lower detection limit of 6.7 x 10(-8) mol L-1 (S/N = 3). This sensor was also applied in the detection of parathion-methyl in pear and cucumber with average recoveries of between 94.9% and 106.2% (RSD < 5%) being obtained. The results mentioned above show that the novel electrochemical sensor is an ideal device for the real-time determination of parathion-methyl in real samples.
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