Sample preparation method for the analysis of some organophosphorus pesticides residues in tomato by ultrasound-assisted solvent extraction followed by dispersive liquid–liquid microextraction

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

“…The relative standard deviation of the peak areas of the pesticides were (RSD) = 1.979 % and 0.363 % for Malathion and Dimethoate, respectively. 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].…”

Recent Developments and Applications of Microextraction Techniques for the Analysis of Pesticide Residues in Fruits and Vegetables

“…The technique was used for the analysis of multi-residue pesticides in peach juice, pulps and peels using dodecan-1-ol (4 µL) and acetone (4 µL) as the extraction and dispersive solvents respectively, and the extraction was based on floating organic solvent [106]. Organophophorus pesticides were analyzed in orange juice samples using chlorobenzene (50 µL) and ultrasound assisted emulsification [107], also in banana using an ionic liquid ([BBIm][PF6]) based extraction solvent and methanol (600 µL) [108], in tomato with ultrasound assisted solvent extraction followed by DLLME with chlorobenzene (10 -11 µL) as an extraction solvent with acetone (1 ml) as the dispersive solvent [109], and in water melon using chlorobenzene (27 µL) and acetonitrile (2.5 ml). Carbamate pesticides were also analyzed in banana, pineapple and tomato juice using trichloromethane (800 µL) and methanol (1.5 ml) [110] and in apple using trichloromethane (60 µL) and acetone (1 ml) [111].…”

Separation and Preconcentration by Dispersive Liquid–Liquid Microextraction Procedure: Recent Applications

“…Bidari et al [36] develop a very simple, rapid, sensitive and small-scale extraction method. Ultrasound-assisted solvent extraction (UASE) and DLLME were used as sample preparation techniques for analysis of 13 organophosphorus pesticides residue in tomato by gas chromatography-flame photometric detection (GC-FPD).…”