The excessive use of methyl parathion (MP) has a serious negative impact on human health andecological environment. In order to monitor the MP residual, a highly sensitive electrochemical sensorwas fabricated with the carboxyl-group functionalized carbon nanotubes modified carbon paperelectrode (COOH-CNT/CPE) for the determination of MP. The carboxyl-group functionalized carbonnanotubes (COOH-CNT) possessed high electrical conductivity, large specific surface area, and goodelectrochemical catalytic performance. The existence of carboxyl groups contributed to the uniformdispersion of carbon nanotubes in liquid solution. Moreover, carbon paper electrode (CPE) presentedlow cost and easy operation. Research results showed good synergistic interaction of the fabricatedCOOH-CNT/CPE sensor. Under the optimal conditions, the fabricated COOH-CNT/CPE sensorexhibited good determination performance of MP with a low detection limit of 27 nM in a great linearMP concentration of 0.06-4 μM and 4-30 μM. Moreover, the COOH-CNT/CPE sensor could show goodpracticability for the determination of MP in human urine. This work is meaningful to the developmentof the simple, low-cost, and sensitive MP sensor.
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