农药学学报2016，Vol.18Issue(2)：232-240,9.DOI:10.16801/j.issn.1008-7303.2016.0031
草莓中吡虫啉和氟硅唑残留的膳食暴露风险
Dietary exposure and risk assessment of imidacloprid and flusilazole residue in greenhouse strawberries
摘要
Abstract
In order to assess the dietary exposure risk of imidacloprid and flusilazole residue in greenhouse strawberry, the final residues and decline trends of imidacloprid and flusilazole used in strawberry were studied. The dietary exposure and risk assessment were conducted based on the supervised field trial data. The results showed that the decline dynamics of imidacloprid and flusilazole accorded with the first-order kinetics in greenhouse conditions with imidacloprid applied at a dosage of 56.25 g (a.i)/hm2 and flusilazole at a dosage of 67.5 g (a.i)/hm2. The half-lives of imidacloprid and flusilazole were 6.3 d and 9.9-11.5 d, respectively. The strawberry was sprayed in 2-3 times at an interval of 7 d with imidacloprid 10% wettable powder at dosage of 37.5 g (a.i)/hm2 and 56.25 g (a.i)/hm2 at the stage of half ripe fruit. At 3, 5, 7, 10 days after the last application, the final residue levels of imidacloprid in greenhouse strawberry at harvesting were 0.022-0.16 mg/kg. The strawberry was sprayed in 2-3 times at an interval of 7 d with flusilazole 400 g/L emulsifiable concentrate at dosage of 45 g (a.i)/hm2 and 67.5 g (a.i)/hm2. At 3, 5, 7, 10 days after the last application, the final residue levels of flusilazole in greenhouse strawberry at harvesting were 0.079-0.30 mg/kg. Chronic and acute risk quotient of imidacloprid and flusilazole were calculated from residue trial data, average dietary intake in all kinds of food and their acceptable daily intake. The results showed that acute risk quotient of imidacloprid and flusilazole in strawberry were about 0.18%-1.01% and 10%-37.7% of their acute reference doses, respectively, indicating that the acute dietary exposure risks of these two pesticides are acceptable. The chronic risk quotient of imidacloprid and flusilazole in strawberry is about 18.6%-85.3% and 68.3%-316.4% of their acceptable daily intakes, respectively. Chronic risk quotient of flusilazole in strawberry for children between 2 and 4 years is about 284.9%-316.4%, indicating chronic risk of flusilazole in baby foods. As exposure risks by strawberry devoted less than 3.2% of the total dietary risks, dietary risk of flusilazole in strawberry may be not the main portion of the whole food dietary. Up to now, no maximum residue limits of imidacloprid and flusilazole in strawberry were set in China. Further, assessments of consumer protection level were carried out based on field trial residues. The results showed that consumer protection levels are acceptable withCPLc of imidacloprid and flusilazole at 18-109, 2-13 andCPLa at 121-725, 6-36. Maximum residue limits at 0.5 mg/kg andPHIs at 3 d, 5 d were recommended for imidacloprid and flusilazole in strawberry, respectively. For 2-4 years old children, the risk of chronic dietary exposure for flusilazole in strawberry could not be ignored.关键词
草莓/吡虫啉/氟硅唑/农药残留/膳食暴露/风险评估Key words
strawberry/imidacloprid/flusilazole/pesticide residues/dietary exposure/risk assessment分类
化学化工引用本文复制引用
赵莉,占绣萍,颜伟中,宋卫国,马琳..草莓中吡虫啉和氟硅唑残留的膳食暴露风险[J].农药学学报,2016,18(2):232-240,9.基金项目
上海市农委科技攻关项目(沪农科攻字(2013)第3-2号) （沪农科攻字(2013）
