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[方法]采用超高效液相色谱法测定了10%噁唑酰草胺可湿性粉剂在水稻及稻田环境中的残留动态。[结果]当噁唑酰草胺及其代谢产物HFMPA、HPFMPA和6-CBO的添加量为0.05~1.0 mg/kg时,其在水稻田土壤、田水、植株、糙米和稻壳中的平均回收率为79.0%~107.3%,变异系数为2.0%~7.2%。[结论]噁唑酰草胺在2年(2010—2011年)3地(福州、天津、南京)的稻田水中的消解半衰期为11.4~53.3 d,土壤中10.0~33.5 d,植株中14.1~36.7 d,其在土壤和植株样品中检出了代谢产物HPFMPA和6-CBO,而在田水样品中未检出代谢产物。按照施药剂量分别为180、270 g a.i./hm2各施药1次,在收获的水稻植株、糙米、稻壳与土壤中的最终残留量均低于最低检出质量分数(稻田土壤<0.008 mg/kg,植株、糙米<0.017 mg/kg,稻壳<0.026 mg/kg)。
[Method] Residual dynamics of 10% oxacillin WP in rice and rice paddy environment was determined by ultra performance liquid chromatography. [Result] When the dosages of oxaprozin and its metabolites HFMPA, HPFMPA and 6-CBO were 0.05-1.0 mg / kg, their mean values in paddy field soil, field water, plant, brown rice and rice husk The recoveries ranged from 79.0% to 107.3% and the coefficients of variation ranged from 2.0% to 7.2%. [Conclusion] The digestion half-life of oxadphamide in paddy water of three years (Fuzhou, Tianjin, Nanjing) in two years (2010-2011) ranged from 11.4 to 53.3 days, from 10.0 to 33.5 days in soil and from 14.1 to 36.7 d, which detected the metabolites HPFMPA and 6-CBO in soil and plant samples, whereas no metabolites were detected in the field water samples. The final residues in the harvested rice plants, brown rice, rice husk and soil were all lower than the minimum detectable mass fraction (paddy soil <0.008 mg / kg, plants, brown rice <0.017 mg / kg, rice husk <0.026 mg / kg).