An Effective and Sensitive Environmental Pollutant Sensor for Pymetrozine

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Abstract Background Establishing an analytical method for detecting environmental pollutant pirimid using electrical analysis technology. Objective Establishing a fast and effective environmental pollutant detection sensor. Methods Prior to the modification, the bare GCE was pretreated with 0.1 μm alumina slurry and rinsed with water to provide a smooth and clean electrode surface. Afterwards, The fresh GCE surface was coated with 10 μL SWCNT suspension (0.5mg/mL) and dried under IR-lamp. Then the poly(L-arginine)/SWCNT modified GCE (poly(L-arginine)/SWCNT/GCE) was obtained by cyclic sweeping between −1500 mV and 2500 mV at the rate of 100 mV/s for 8 cycles in a PBS (pH 8.0) containing 2.5 × 10−3 mol/L L-arginine. This was the optimal depositional condition for fabricating the poly(L-arginine)/SWCNT/GCE from test. To evaluate the practical applicability of present method, farmland soil and river water were selected as sample. Results In this study, we fabricated an electrochemical sensor to detect pymetrozine via combining SWCNT and electro-polymerizing poly(L-arginine) film modified GCE, as well as its electrochemical behavior. The as-prepared sensor features excellent electrocatalytic activities. It was also observed that the electrochemical property of the sensor was substantially improved because SWCNT afforded an enlarged active surface and accelerated electron transport. This sensor affords LSV in the linear range of 0.05∼1.0 μM pymetrozine with a 17 nM low detection limit (S/N =3). Conclusions A new and sensitive electrochemical sensor for pymetrozine determination was developed based on a single-walled carbon nanotubes (SWCNT) and poly(L-arginine) film. Results suggests that the poly(L-arginine)/SWCNT modified electrode exhibited a very low limit of detection. Highlights The sensor enabled the measurement of pymetrozine in real samples obtained from farmland soil and river water. This work promoted the potential applications of amino acid materials and SWCNT in environmental pollution science.