The degradation and dietary risk assessment of chlorfluazuron in Beijing apple production
[Objective] In order to research the residue dynamics of chlorfluazuron in apple and value the dietary risk.[Methods] The high performance liquid chromatography (HPLC) and risk quotient (RQ) were used for the evaluation.[Results]The results showed that the fortified recovery rates ranged from 82.49 ％ to 108.0 ％,with variation coefficients of 3.33％-10.49 ％ at levels of 0.1 mg/kg,0.5 mg/kg and 1.0 mg/kg,and the limit of quantification for chlorfluazuron in apple was 0.02 mg/kg.The field residue dynamics study showed that the T50 of chlorfluazuron in apple was 7.77 d in recommended dosage.When the apple was sprayed twice dosage,the T50 of chlorfluazuron was 7.60 d,and the residue was 0.23 mg/kg,lower than the maximum residues of chlorfluazuron in fruit in national food safety standard (0.5 mg/kg).In addition,the value of RQ was lower than 1 in final residue and thus could be accepted.[Conclusion]The method of high performance liquid chromatography (HPLC) could be used for the residue detection of chlorfluazuron in apples.It also implied that it was relatively safe for us to pick apples when using recommended dosage of chlorfluazuron in apple orchards.
NETL
NSTL
万方数据
维普
