Pesticide Residue Laboratory, Indian Institute of Horticultural Research, Hessaraghatta Lake, PO, Bangaluru, Karnataka, 560 089, India.
Bull Environ Contam Toxicol. 2011 Dec;87(6):703-7. doi: 10.1007/s00128-011-0403-z. Epub 2011 Sep 16.
Residue persistence of tebuconazole and quinalphos in immature onion bulb with leaves (spring onion), mature onion bulb and soil was studied following their spray applications 3 times. The applications were untreated control; tebuconazole @ 187.5 and 375 g a.i. ha(-1); quinalphos @ 300 and 600 g a.i. ha(-1). Initial residue deposits of tebuconazole in immature onion bulb with leaves from the two treatments were 0.628 and 1.228 mg kg(-1). The residues of tebuconazole dissipated with the half-life of 5 and 7.7 days. The safe pre-harvest intervals (PHI) for consumption of immature onion bulb with leaves were 16 and 35 days, respectively. Initial residue deposits of quinalphos in immature onion bulb with leaves from the two treatments were 0.864 and 2.283 mg kg(-1). Loss of quinalphos residues from immature onion bulb with leaves was very fast. The residues dissipated with the half-life of 1.7 and 2.6 days and the required PHI was 5 and 11 days, respectively. At harvest mature onion bulbs were free from residues of both tebuconazole and quinalphos.
研究了 3 次喷雾处理后，叶用未成熟洋葱鳞茎（青葱）、成熟洋葱鳞茎和土壤中噻菌灵和喹硫磷的残留情况。处理方式为未处理对照；噻菌灵@187.5 和 375 g a.i. ha(-1)；喹硫磷@300 和 600 g a.i. ha(-1)。两种处理方式下，叶用未成熟洋葱鳞茎中噻菌灵的初始残留量分别为 0.628 和 1.228 mg kg(-1)。噻菌灵的残留量半衰期为 5 天和 7.7 天。食用叶用未成熟洋葱鳞茎的安全收获前间隔（PHI）分别为 16 天和 35 天。两种处理方式下，叶用未成熟洋葱鳞茎中喹硫磷的初始残留量分别为 0.864 和 2.283 mg kg(-1)。喹硫磷残留从叶用未成熟洋葱鳞茎中的损失非常快。残留半衰期为 1.7 天和 2.6 天，所需 PHI 分别为 5 天和 11 天。收获时，成熟洋葱鳞茎中均未检出噻菌灵和喹硫磷的残留。
