Dissipation of methomyl residues in tomato fruits, soil and water using LC-MS/MS
Dalia El-Hefny 1, A
Ibrahim Abdallah 2, D  
Rania Helmy 1, C
Hend Mahmoud 1, E-F
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Pesticide Analysis Department, Central Agricultural Pesticide Laboratory, Giza, Egypt
Entomology and Pesticides Department, Faculty of Agriculture, Cairo University, Giza, Egypt
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
Ibrahim Abdallah   

Entomology and Pesticides Department, Faculty of Agriculture, Cairo University, Giza, Egypt
Online publish date: 2019-10-07
Submission date: 2018-12-01
Acceptance date: 2019-08-16
Journal of Plant Protection Research 2019;59(3):355–361
Tomato is an economically important vegetable crop which is attacked heavily by insect pests leading to reduction of yield and quality of the fruits. Field experiments were carried out to investigate the dissipation of methomyl (a common insecticide) used mainly on tomato fruits. LC-MS/MS coupled with the QuEChERS method were used for the determination of methomyl. The results showed that the recovery using matrix-matched standards ranged from 87.8 to 101.3%, with relative standard deviation of 2.5 to 7.5%. Kinetics equation, Log R = log R0 – 0.434 Kt, was used to calculate the rate of degradation in tomato, soil and water. Residue half-life calculated using kinetic rate ranged from 1.95 to 1.63 days in tomato and soil, respectively. From the results it was concluded that tomato fruits can be safely harvested for consumption after 15 days of application based on estimated preharvest interval (PHI). It is advisable to re-estimate the PHI regularly owing to data from the EU and Codex.
The authors have declared that no conflict of interests exist.
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