magnetic dispersive micro-solid phase extraction based carbon nanotubes/ metal-organic framework as nanosorbent for trace determination of triazole fungicides in agricultural waste water and agricultural soil samples

Triazole fungicides (tfs) are systemic pesticides that are broadly used to prevent fungal sickness in agriculture. hexaconazole, triticonazole, difenoconazole belong to the triazole group of fungicides and are widely used in vegetables and fruits fields to control diseases such as blast, sheath blight and false smut and fruits spots[1]. thus, developing a fast, simple and reliable method to monitor the residues of fungicides in the environment is of prime importance[2].in this research, the magnetic dispersive micro solid phase extraction (m-d-µ-spe) method was used to pre-concentration and traces detection of triazole fungicides in agricultural waste water and agricultural soil samples. the nanocomposite based on magnetized carbon nanotubes/cu-based mof (m-mwcnt-cu-bdc) synthesized and used as a nanosorbent. the nanocomposite was characterized by fourier transform infrared spectroscopy, x-ray diffraction, vibrating-sample magnetometer, field emission scanning electron microscopy and energy-dispersive x-ray spectroscopy. the effective parameters were optimized in the method and under the optimized conditions (solution ph value: 7.0; amount of sorbent: 30 mg; extraction time: 30 min; desorption agent: ethanol and desorption time: 5 min), the limit of detection (lod) was 0.45 ng ml-1 and the linear range was 1.50 to 750 ng ml-1 with a correlation coefficient higher than 0.993. the repeatability (%rsd) of the method for 5 replications ranged from 2.8 to 5.5%. excellent preconcentration factor (pf = 91-94) and high recoveries (above 90%). finally, this method applied to determination of triazole fungicides in agricultural waste water and agricultural soil samples.m-d-µ-spe method using a novel nanosorbent m-mwcnt-cu-bdc was successfully implemented for the extraction and sorption of tfs from various real samples prior to the cd-ims quantification. the presented sample preparation method is a new extraction method for separation and trace detection of tfs in environmental samples.