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The presence of pesticide residue in farmer market produce
Zhou, R. J. (2020). The presence of pesticide residue in farmer market produce: thiabendazole residues in various produce sold at local farmers' markets. Bcit Environmental Health Journal.
Background: Thiabendazole is a pesticide that is mainly used after harvesting and directly applied to
produce such as citrus fruits, apples, pears, bananas, mangos, corn, carrots and potatoes in the form of a
spray or dip. The most common and most likely route of exposure to pesticide for the average person is
through their diet. Studies have shown that the health risk of regular consumption of pesticide residue
through produce is linked with disruption to various functions in the body, such as reproductive,
developmental and hormone irregularity. The following study tests whether fruits and vegetables sold at
farmers markets contain Thiabendazole and if they are below the acceptable Maximum Residue Limits
(MRLs) set by Health Canada.
Methods: A QuEChERS method and solid phase extraction was used to recover Thiabendazole from
various fruits and vegetables. The gas chromatography was used to analyze all samples and a calibration
curve was produced to identify the concentration of Thiabendazole.
Results: Thiabendazole was detected in all of the citrus fruit samples, but was below detectable limits for
all other fruits and vegetables. All Thiabendazole levels were below the Maximum Residue Level allowed
by Health Canada.
Conclusion: The various fruits and vegetables analyzed are all below the MRL, with only the citrus fruits
having detectable concentrations. However, since the citrus fruits were imported, further studies are
required on different pesticide compounds to determine if locally grown produce meet the MRL for other
pesticide compounds., Peer reviewed, Peer-reviewed article, Published, Project submitted in partial fulfillment of the requirement for the degree of Bachelor of Technology in Environmental Health, British Columbia Institute of Technology 2020., Farmers markets, Pesticides, Pesticide residues, Thiabendazole, Fruits and vegetables
