Dissipation rules and dietary risk assessment of acetamiprid residues in peach

Acetamiprid has a high detection rate but is not registered on peach in China. Lack of information such as application or pre-harvest intervals may lead to irrational pesticide use and high residue risks. In order to identify the residue risks of acetamiprid in peach fruit, degradation experiments and simulated farmer application experiments were carried out. Also, from 2015 to 2018, the acetamiprid residues in peach from nine main producing areas in China were investigated and the dietary intake risk was analyzed. The results showed that the degradation of acetamiprid in peach peel and pulp conformed to the first-order kinetic equation, and the half-lives were 3.92 and 3.14 d, respectively. Simulated farmer application experiments showed that the residual amounts at 7, 14 and 21 d after last application were low in both applications and far lower than the maximum residue limit(MRL), and removing the peach peel can drastically reduce the intake risks. The detection rate in 509 peach samples from the nine producing areas ranged from 8% to 38%. Residues value was between 0.001-1.348 mg/kg and all the residues did not excess the MRL. For 4 consecutive years, the ratio of acute dietary intake risk to ARfD on peaches was in the range of 1.520%-13.755%, and the ratio of chronic dietary intake risk to ADI was in the range of 0.021%-0.086%, which accounts for a small contribution to the overall dietary exposure.