OBJECTIVE To establish a method for the transformation of some commonly used pesticide limit standards in Chry-santhemi Flos based on'GB 2763 National Food Safety Standard-Maximum Residue Limits for Pesticides in Food'.METHODS The indexes of Chrysanthemi Flos(dry)in GB 2763 were sorted out,and the quasi-transformation pesticides were determined as pymetrozine,imidacloprid,boscalid and fluazinam according to the transformation principle.The UPLC-MS/MS method was used to establish the transformation method of Chrysanthemi Flos,and the methodological verification was carried out.RESULTS The four pesticides had good linear relationship in the range of 1-50 ng·mL-1,the correlation coefficients were 0.999 9,the average recovery was 77.9％-95.5％,and the RSD was 1.7％-6.8％.The overall detection rate of the samples was 60％,and the pesticide with the highest detection rate was imidacloprid.The maximum detectable amount was 1 mg·kg-1(imidacloprid),and the results did not exceed the maximum residue limit specified in GB 2763.The risk assessment system of pesticide residues in traditional Chinese medicine was used to evaluate the chronic risk of the four pesticide limit values to be transformed.The results showed that the chronic risk of fluazinam was greater than 1,and the chronic risk quotients of the other three pesticides were less than 1.Therefore,fluazinam is not converted temporarily,and only pymetrozine,imidacloprid and boscalid are converted.CONCLUSION The three limit stand-ards of pymetrozine,imidacloprid and boscalid in Chrysanthemi Flos were transformed.The established limit standard transformation method is simple and accurate,which is of great significance for standardizing the use of pesticides and medicinal safety in the process of chrysanthemum planting.
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