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

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 ngmL(-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.