【摘要】 研究了新磺酰脲除草剂单嘧磺隆在土壤中的残留分析方法及其土壤消解动态和最终残留。土壤经甲醇和稀氨水混合液提取 ,液液分配及 C18净化 ,浓缩后用带紫外检测器的高效液相色谱仪进行测定。单嘧磺隆的最低检出量为 4 ng,在土壤中的最低检出浓度为0 .0 2 mg/ kg。本方法的添加回收率为 95.10 %～ 10 3.77% ,变异系数为 1.4 7%～ 11.80 % ,符合农药残留分析的要求。运用上述方法 ,测定了单嘧磺隆在北京和山东土壤中的消解动态以及最终残留。结果表明 :单嘧磺隆在土壤中消解的速度较慢 ,在北京土壤中的半衰期为 9.2 4 d,山东土壤中的半衰期为 13.59d。按推荐剂量施药 ,小麦收获时 ,在北京和山东两地土壤中均未检出单嘧磺隆。更多还原

【Abstract】 The method of residue analysis of a new sulfonylurea herbicide monosulfuron,its degradation in soil, and terminal residue in soil were studied. Residues of monosulfuron were extracted from soil with methanol ammonium hydroxide, followed by liquid liquid partition and cleaned up by C 18 column, concentrated to a small volume, and then determined by HPLC with UV detector. The average recoveries and coefficients of variation of the method were 95.10%～103.77% and 1.47%～11.80% respectively. The minimum detectable quantity of monosulfuron was 4 ng, the minimum detectable concentration of monosulfuron in soil sample was 0.02 mg/kg. The soil degradation of monosulfuron in Shandong and Beijing were determined with the method described above. The results showed that the field half lives of monosulfuron in the two kinds of soil were about 9.24 days and 13.59 days, respectively. When monosulfuron was applied according to recommended dosage, the final residues of monosulfuron in soils at the time of wheat harvest were not detected by this method.更多还原