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This work focuses upon the easy and efficient synthesis of multi-walled carbon nanotubes (MWCNT) decorated with magnetite used in the vortex-assisted magnetic solid-phase microextraction (VA-m-µ-SPE) of atrazine in water and food samples. The nanocomposite was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and infrared spectroscopy. Parameters that influenced VA-m-µ-SPE (pH, mMWCNT mass, extraction time, eluent type and volume, and sample volume) were optimized. The presented technique provided a preconcentration factor of 10-fold with limits of detection and quantification of 2.1 μg L −1  and 6.4 μg L −1 , respectively, and a linear range from 12.5 to 250 μg L −1 . VA-m-µ-SPE has been applied in the preconcentration and determination of atrazine in the natural waters. In addition, atrazine was determined in ginger and fennel.

analytical letters

Separation and Preconcentration of Atrazine on Magnetic Multiwalled Carbon Nanotubes before Determination in Food and Water Samples by High-Performance Liquid Chromatography with Diode Array Detection (HPLC-DAD)