Abstract
Methyl bromide has been the most widely applied fumigant in the world, but most countries have phased out production and application of methyl bromide due to its toxicity to humans and the ozone. In this study, a specific headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry (HS-SPME/GC-MS) method was developed, optimized and validated for the determination of methyl bromide residues in tea. The established method was evaluated in terms of specificity, sensitivity, linearity, accuracy and precision. Linear plots were obtained in the range of 0.05−2.0 mg·kg<sup>−1</sup>. The limit of quantification (LOQ) was 0.05 mg·kg<sup>−1</sup>. Recoveries for the accuracy ranged from 95.0% to 107.7% and the relative standard deviation was in the range of 0.4%−6.1%. This developed method was used to analyze 25 real samples and the results showed that methyl bromide residue was not found in all samples studied. Therefore, the established method can be applied to the determination of methyl bromide residues in tea, and provide a reference for the detection of methyl bromide residues in other plant-based beverages.
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