借助加速溶剂提取、凝胶渗透色谱净化和液相色谱测定方法,研究了南京和南昌两地稻田施用w为10％的恶唑酰草胺乳油后,其有效成分恶唑酰草胺在稻田中的残留及消解动态.结果表明,恶唑酰草胺在水稻植株、稻田土壤及稻田水中的消解较快,在南京和南昌两地水稻植株中的消解半衰期分别为3.5和2.2d,在稻田土壤中的消解半衰期分别为11.7和20.2 d,在稻田水中的消解半衰期分别为1.3和2.3d.在稻田中按照最高推荐剂量和最高推荐剂量的2倍施用恶唑酰草胺乳油,施药1次,在收获的稻秆、稻壳、糙米及稻田土壤中均未检出恶唑酰草胺.这说明恶唑酰草胺为低残留、易降解农药.%Field experiments were conducted in Jiangxi and Jiangsu Provinces, separately, of spraying metamifop (10% emulsifiable solution) in paddy fields to explore dynamics of metamifop residues in the paddy fields with the accelerated solvent extraction ( ASE ) , gel permeation chromatography ( GPC ) and high performance liquid chromatography ( HPLC ) methods. Results show that metamifop degraded quickly in the plant and water, but not so in the soil. The half-life of metamifop in plant, water and soil was approximately 3. 5 and 2. 2 days, 1. 3 and 2. 3 days, 11. 7 and 20. 2 days at Nanjing and Nanchang, respectively. When a paddy field was sprayed once with 10% metamifop emulsifiable solution at the highest recommended dose and even 2 times of that value, no residue of the substance was detected in rice straw, rice hull, brown rice and paddy soil at the harvest, which suggests that metamifop is a kind of pesticide low in residue and easy to degrade.
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