百菌清在番茄上的自然消解动态及健康风险研究
Study on Natural Dynamic Degradation of Chlorothalonil in Tomato and Its Health Risks

试验设喷施百菌清推荐剂量（2 400 g/hm，T1）、加倍剂量（4 800 g/hm2,T2）、喷清水（对照）3个处理。探讨蔬菜上百菌清残留量的安全性，开展番茄中百菌清残留的消解规律试验。结果表明，百菌清在番茄上的自然消解速度随施药剂量的增大而减慢。喷药后24 h内消解最快，T1处理和T2处理施药后1 d的消解率分别为60.22%和27.58%，7 d的消解率达91.72%和46.67%，其半衰期分别为4.3 d和18.0 d。按推荐剂量施药1 d后采摘，番茄中百菌清残留量为0.370 mg/kg,符合国家相关标准的规定；从人体健康风险角度分析，如果按规范施药，百菌清在番茄上施用安全，产品食用无健康风险。
To study the safety of pesticide residues in vegetable, the experiments on natural dynamic degradation of chlorothalonil in tomato were carried out . The results showed that the higher treated dosage was, the slower the degrading speed of chlorothalonil residues in tomato. It degraded fastest in the first 24 h after spraying. The chlorothalonil residues in treatments of recommended dosage and doubled recommended dosage degraded by 60.22% and 27.58% in 1 d, then by 91.72% and 46.67% in 7 d, respectively. Therefore in these cases the half lives of decomposition of chlorothalonil residues in tomato would be 4.3 d and 18.0 d, respectively. In treatments of recommended dosage the content of chlorothalonil in tomato was 0.370 mg/kg in 24 h after spraying, complying with the provisions of the relevant national standards.According to application, specifications, applying pesticide chlorothalonil on tomato was safe in human beings health risk,and tomato products consumption has no health risks.