ORIGINAL ARTICLE
Dissipation of methomyl residues in tomato fruits, soil and water using LC-MS/MS
1
Pesticide Analysis Department, Central Agricultural Pesticide Laboratory, Giza, Egypt
2
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
Submission date: 2018-12-01
Acceptance date: 2019-08-16
Online publication date: 2019-10-07
Corresponding author
Ibrahim Abdallah
Entomology and Pesticides Department, Faculty of Agriculture, Cairo University, Giza, Egypt
Entomology and Pesticides Department, Faculty of Agriculture, Cairo University, Giza, Egypt
Journal of Plant Protection Research 2019;59(3):355-361
KEYWORDS
TOPICS
ABSTRACT
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.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
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