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【目的】评价禾草丹和异丙隆在直播水稻田施用后的生态环境和糙米的安全性。【方法】进行2年3地田间试验,采用高效液相色谱-串联质谱法(HPLC-MS/MS)测定稻田土壤中禾草丹和异丙隆的消解动态及其在糙米和土壤中的最终残留。【结果】在0.01~0.5mg/kg添加水平下,禾草丹和异丙隆在土壤和糙米中的平均回收率为80.4%~108.8%,变异系数为0.6%~12.6%。田间试验结果表明:禾草丹和异丙隆在稻田土壤中施药2h后的原始沉积量分别为0.141~1.134mg/kg和0.066~0.543mg/kg,半衰期分别为1.1~4.2d和0.4~4.4d。收获期稻田土壤和糙米中两者的最终残留量均未检出。【结论】禾草丹和异丙隆均属于易降解农药,50%禾草丹·异丙隆WP按推荐剂量(900g a.i./hm2,即1 800g/hm2)施用于直播水稻田中,施药1次,收获的糙米安全。
【Objective】 The objective of this study was to evaluate the ecological environment and brown rice safety of graminex and isoproturon in direct-seeded rice fields. 【Method】 Field experiments were conducted in three years in two years. The digestion dynamics of graminexel and isoproturon in paddy soils were determined by HPLC-MS / MS and finally in brown rice and soil Residual. 【Result】 The results showed that the average recoveries of gramine and isoproturon in soil and brown rice ranged from 80.4% to 108.8% with a coefficient of variation from 0.6% to 12.6% at 0.01-0.5 mg / kg. The results of field experiments showed that the initial sediment contents of gramine and isoproturon in paddy soil were 0.141-1.324 mg / kg and 0.066-0.543 mg / kg, respectively, and the half-lives were 1.1-4.2 d and 0.4-0.4 mg / 4.4d. The final residues of both paddy soils and brown rice at harvest were not detected. 【Conclusion】 Both grass and isoprenone are easy degradable pesticides, and 50% WP and WP are applied to direct seeding rice fields at the recommended dose (900 g ai / hm2, ie 1 800 g / hm2) Times, the brown rice harvested safely.