Date of Award
2010
Thesis Type
Masters
Document Type
Dissertation
Divisions
Faculty of Science
Department
Department of Chemistry
Institution
Universiti Malaya
Abstract
A liquid chromatography tandem mass spectrometry (LC-Q-TOF MS) technique was used to simultaneously determine six types of carbamates and organophosphorus pesticides residue in vegetables. The pesticides were extracted by ultrasonic solvent extraction method using ethyl acetate as the extraction solvent followed by Florisil column clean up. Four types of common consumed vegetables from local hypermarket were used to study the recovery. The accurate mass measurement and retention time were used to identify and determine the empirical formula of the pesticides. The mass accuracy errors were less than 7 ppm for all the investigated pesticides. The limit of detection (LOD) were 10 ppb for all the pesticides. Calibration curves were obtained from the pesticides in pure methanol solvent from the range of 0.01ppm to 0.40 ppm. The linearity coefficient, R2 of the calibration curve for each type of pesticides was > 0.99. The recoveries of acephate and profenofos were 80–120%, and 50-130% for dimethoate, diazinon and quinalphos. All the recoveries of pesticides were in the acceptable range except for carbaryl which was less than 30%.
Additional Information
Dissertation (M.A.) – Faculty of Science, Universiti Malaya, 2010.
Recommended Citation
Ae Ru, Tin, "Identification and quantification of pesticides residue in vegetables by liquid chromatography quadrupole-time-of flight mass spectrometry (LC-Q-TOF MS)." (2010). Student Works (2010-2019). 363.
https://knova.um.edu.my/student_works_2010s/363
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.
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