|Title:||Enzyme-free electrochemical detection of nanomolar levels of the organophosphorus pesticide paraoxon-ethyl by using a poly(N-isopropyl acrylamide)-chitosan microgel decorated with palladium nanoparticles||Authors:||Ranganathan, Palraj
Chen, Shen Ming
|Keywords:||Nitro compounds | Pesticide detection | PNIPAM-CT microgel | Real sample analysis | Voltammetry method||Issue Date:||1-Mar-2019||Journal Volume:||186||Journal Issue:||3||Source:||Microchimica Acta||Abstract:||
© 2019, Springer-Verlag GmbH Austria, part of Springer Nature. A rapid voltammetric method is described for the determination of the organophosphorus pesticide paraoxon-ethyl (PEL). A glassy carbon electrode (GCE) was modified with a composite consisting of a poly(N-isopropylacrylamide)-chitosan microgel with incorporated palladium nanoparticles. The microgel was characterized by FE-SEM, EDX, XPS, FTIR, XRD, and EIS. The modified GCE is shown to enable direct electro-reductive determination of PEL by using differential pulse voltammetry. The method works in pH 7 solution and in the 0.01 μM to 1.3 mM PEL concentration range. At a typical working potential of −0.66 V (vs. Ag/AgCl) (at 50 mV/s), the detection limit is as low as 0.7 nM, and the electrochemical sensitivity is 1.60 μA μM −1 cm −2 . Intriguingly, the modified GCE displays good recovery when applied to bok choy and water samples.
|Appears in Collections:||政治學系|
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