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[目的]研究氟酰胺在稻田环境中的残留消解情况。[方法]样品采用分散固相萃取-气相色谱法。[结果]氟酰胺在糙米、稻壳、植株、田水和土壤中的平均回收率在87.00%~98.84%之间、标准偏差在0.57%~2.31%之间、变异分数在0.58%~2.44%之间;氟酰胺的最小检出量为1.0×10-11g,在糙米、稻壳、植株、田水和土壤中的最低检测质量分数分别为0.02、0.1、0.05、0.02、0.02 mg/kg。2011—2012年在安徽、湖南和广西试验结果表明:水稻植株中降解半衰期为1.9~5.3 d,稻田水中降解半衰期为1.8~5.1 d,稻田土壤中降解半衰期为4.8~7.7 d;20%氟酰胺·嘧菌酯水分散粒剂以450 g a.i./hm2(1.5倍推荐高剂量)、300 g a.i./hm2(推荐高剂量)施药剂量,施药3、4次,采收间隔期为20、30 d,糙米中氟酰胺的最终残留量最高为0.63 mg/kg(低于2.0 mg/kg)。[结论]中国规定糙米中氟酰胺的最大残留限量值(MRL)2.0 mg/kg,以此依据,20%氟胺·嘧菌酯水分散粒剂用于防治水稻纹枯病,于水稻纹枯病发病初期田间喷雾,最高用药量450 g a.i./hm2,最多施药4次,氟酰胺安全间隔期为20 d。
[Objective] The research aimed to study the residual digestion of flutamide in paddy field. [Method] The samples were analyzed by dispersive solid phase extraction - gas chromatography. [Result] The average recoveries of flutamide in brown rice, rice husk, plant, field water and soil ranged from 87.00% to 98.84% with the standard deviations between 0.57% and 2.31% and the variation fraction between 0.58% and 2.44% ; The minimum detectable amount of flutamide is 1.0 × 10-11g, and the lowest detected mass fraction in brown rice, rice hull, plant, field water and soil are 0.02,0.1,0.05,0.02,0.02 mg / kg respectively. The results from 2011 to 2012 in Anhui, Hunan and Guangxi showed that the half-lives of degradation in rice plants ranged from 1.9 to 5.3 days, the half-lives in rice water ranged from 1.8 to 5.1 days, and the half-lives in paddy soil ranged from 4.8 to 7.7 days. · Azoxystrobin water dispersible granules are applied in dosage of 450 g ai / hm2 (1.5 times recommended high dosage) and 300 g ai / hm2 (recommended high dosage), the dosage is 3 and 4 times, the harvest interval is 20, The final residues of flutamide in brown rice were 0.63 mg / kg (less than 2.0 mg / kg) after 30 days. [Conclusion] The maximum residue limit of flutolanil (MRL) in Chinese brown rice was 2.0 mg / kg. Based on this, 20% fluramines and azoxystrobin water dispersible granules were used to control rice sheath blight, The early onset of the disease field spray, the highest dose of 450 g ai / hm2, up to 4 times the application, flutamide safety interval of 20 d.