Abstract:

In order to study the residue behavior and dietary intake risk of prochloraz and its metabolites in celery and ginger, the 1-year and 6-site standardized residue test of prochloraz and its metabolites in celery and ginger was carried out, samples were analyzed by gas chromatography (GC-ECD), and the dietary intake risk of prochloraz and its metabolites in celery and ginger were evaluated by using the methods of Joint Meeting on Pesticide Residues. When the adding levels of prochloraz were 0.02, 0.1 and 1 mg/kg, the average recovery rate of prochloraz in ginger was 77%-87%, and its relative standard deviation was 3%-13%.When the adding levels of prochloraz were 0.05, 0.5, 1 and 10 mg/kg, the average recovery rate of prochloraz in celery was 75%-114%, and its relative standard deviation was 3%-6%. The half-life of prochloraz in celery was from 6.1-6.8 d. The national estimated daily intake (NEDI) of prochloraz for the general population was 0.67331 mg/d, and the risk probability of dietary intake was 106.9%. The results show that the dietary intake risk of prochloraz and its metabolites is not acceptable for the general population of China. This experiment provides a basis for the rational application and scientific supervision of prochloraz in vegetables, and the establishment of Maximum Residue Limit (MRL) standards of prochloraz and its metabolites in celery and ginger.

Key words: prochloraz, metabolites, dietary risk assessment, celery, ginger, digestion dynamics