The dissipation behavior, final residues and potential dietary risks of four commonly used insecticides and acaricides (triazophos, profenofos, chlorpyrifos and bifenthrin) were determined by liquid chromatography-tandem mass spectrometry technology with a late hybrid variety ‘Orah mandarin’ as the research object. The results showed that satisfactory results of good linearity (r≥0.99), sensitivity (limits of quantification 10 μg/kg), recoveries (74.1%-100.6%) with relative standard deviations (0.5%-13.5%) were obtained in the method validation, which could meet the requirements for the determination of the four pesticide residues in Orah mandarin. The half-lives of triazophos, profenofos, chlorpyrifos and bifenthrin in Orah mandarin were 21.7-30.1 d, 22.4-28.9 d, 13.9-15.4 d and 19.8-24.8 d, respectively according to first-order kinetics. The final residues of triazophos, profenofos and bifenthrin were all above their MRLs with a slow dissipation rate. Only residual concentration of chlorpyrifos was below its MRL at pre-harvest interval. Residues of the four pesticides were mainly found in peels and the health risks of four pesticide residues in Orah flesh were negligible low. However, the potential acute dietary exposure risks of triazophos to children and general population and bifenthrin to children from Orah whole fruits were unacceptable. Therefore, the use of triazophos, profenofos and bifenthrin after fruit color break period should be prohibited. It is advisable to avoid consuming the processed products from the whole fruits or peels of Orah mandarins. The results of this study can provide a technical reference for the safe production, monitoring and consumption guidance of Orah mandarins in China.
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