Polydopamine‐Functionalized Carbon Nanotubes for Pipette‐Tip Micro‐Solid Phase Extraction of Malathion and Parathion from Environmental Samples

Abstract

Abstract In this study, a polydopamine‐functionalized multi‐walled carbon nanotube was utilized in an efficient pipette‐tip micro‐solid phase extraction followed by gas chromatography‐mass spectrometry for determination of two organophosphorus pesticides called malathion and parathion. All the effective parameters were optimized using a one variable at‐a‐time protocol. Under the optimal conditions, broad calibration curves were obtained with the linearity in the range between 0.30–200 ng mL −1 . Preconcentration factors as high as 42.7 and 47.3 for malathion and parathion, respectively, were obtained along with the relative standard deviations (RSD%) lower than 6.37 %. Real samples analysis was carried out using the optimized technique for quantitative analysis of the target analytes in environmental water samples. Relative recoveries in the range between 89.37–101.22 % show the capability of the method in real sample analysis.