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Chinese onion is a common vegetable in daily diet, especially in Southwest China. We collected 184 samples from farm and market in Chongqing Municipality during 2020–2021 and established a multi-residue method for analysis of 79 pesticide residues on Chinese onion. Sixty-three of 184 samples were found pesticide resdues, accounting for 34.2%. A total of 31 pesticides were detected, and 6 pesticides in 11 samples have exceeded the Chinese MRLs, 5.98% of all samples. The chronic and acute dietary exposure assessment showed the %ADI and the %ARfD value were 0.005%–5.46% and 0.03%–297.95%, respectively. The %ARfD of most pesticides were acceptable except for cyhalothrin (297.95%, children; 140.17%, adults) and carbofuran (107.94%, children). The study indicated that pesticide residues on Chinese onion had different concentration levels which were low commonly. The establishment of MRLs for several pesticides (cyfluthrin, carbendazim, propamocarb) in Chinese onion is required for better estimation of dietary risk. [ABSTRACT FROM AUTHOR]

Herein, a QuEChERS (quick, easy, cheap, effective, rugged, and safe) procedure together with liquid chromatography and tandem mass spectrometry was applied to the multi-residue analysis of 203 pesticides in strawberries. To reduce the amount of co-eluents, we compared several dispersive solid-phase extraction cleanup procedures and found that cleanup using octadecylsilane provided the best recoveries. Spiked-sample recoveries of 70–120% with relative standard deviations of <20% were obtained for all tested pesticides except for quinmerac. Matrix-matched calibration curves exhibited good linearities (R2 > 0.99), and the limits of quantification (LOQs) were lower than the maximum residue limits recommended by the European Commission and Korea Food and Drug Administration. The developed method was applied to real samples, revealing that their pesticide contents exceeded the corresponding LOQs. The obtained results demonstrate that octadecylsilane-based dispersive solid-phase extraction is a rapid and high-throughput cleanup procedure for the multi-residue analysis of pesticides in strawberries. [ABSTRACT FROM AUTHOR]