Ultra-preconcentration and determination of thirteen organophosphorus pesticides in water samples using solid-phase extraction followed by dispersive liquid–liquid microextraction and gas chromatography with flame photometric detection

Study of the Effect of Air to Fuel Ratio Parameter on the Organophosphorus – Pesticide Analysis by GC-FPD

“…The result revealed that, the deviation was not exceeding 20 %, in accordance with the methods of validation of pesticide residues reported in other research [15]. In addition to, the deviation was in a range similar or better than those obtained in other studies using GC-FPD-P mode (1.7, 1.2, and 5.6 %) [16]. …”

β-cyclodextrin functionalized meso-/macroporous magnetic titanium dioxide adsorbent as extraction material combined with gas chromatography-mass spectrometry for the detection of chlorobenzenes in soil samples

“…The most commonly used solvents for CBs are acetone, dichloromethane (DCM), acetonitrile, ethyl acetate and n-hexane in CBs analysis [31]. So we applied these solvents to elute CBs from the homemade SPE column.…”

Development of a new extraction method based on counter current salting-out homogenous liquid–liquid extraction followed by dispersive liquid–liquid microextraction: Application for the extraction and preconcentration of widely used pesticides from fruit juices

“…In order to study the effect of the volume of preconcentration solvent on the performance of the DLLME step, different volumes of 1,1,2,2-TCE (20,30,40,50, and 60) were tested. According to the results (not shown), by increasing the volume of 1,1,2,2-TCE from 20 mL to 60 mL, analytical signals of the analytes were decreased rapidly.…”