الفهرس 
Standard solutions preparationsOnly 14 pages are availabe for public view
 |  | from | 215 |  |  |
| | | from | 215 | | |
Abstract
A multi-residue quantitative method in combination with liquid and gas chromatography-tandem mass spectrometry, was employed to monitor 281 pesticide residues in the most consumed vegetables namely, green beans, carrot, coriander, cucumber, eggplant, lettuce, onion, parsley, pepper and tomato at the wholesale markets in Egypt during 2018. Among 506 samples analyzed, 66 different pesticide residues were detected in 405 samples (80%) whereas, 260 samples (51%) were contaminated with pesticide residues at levels lower than maximum residue limits and 145 samples (29%) were violated. The highest violation was observed at (60%, 58%, 46 % & 33%) in parsley followed by pepper, green beans and coriander, respectively. Chlorpyrifos, profenofos malathion, lambda-cyhalothrin and metalaxyl were the most frequently detected pesticides. The highest hazard index was found in tomato for emmactin benzoate (10%) against the acceptable daily intake value for adults. Tomato was the most contributing commodity to the chronic exposure representing 56% to the total risk. The values of cumulative exposure for carbamates, heterocyclic, neonicotinoid, organophosphorus, and pyrethroids were calculated and found to be <1 (0.006-0.256). The exceedance percentage of ARfD was obtained for 8 cases for adults and one for women, ranged from (110%-1660%), indicating a potential serious risk to consumers due to the consumption of these Egyptian vegetables on short-term intake. Evaluation of matrix effect of some vegetables co-extractives in frequently used fungicides and herbicides by ultrahigh-performance LC-MS/MS was carried out by comparing the slopes of target analytes. The results emphasize the importance of matrix effect study for a reliable quantitative method in food analysis.