摘要:
研究了单嘧磺隆的残留分析方法,单嘧磺隆在土壤中的消解动态和在土壤、小麦中的最终残留.土壤经甲醇/氨水混合液提取(小麦用丙酮/水混合液).液液分配及C18小柱净化、用带紫外检测器的高效液相色谱仪测定.单嘧磺隆的最低检出量为4ng,在土壤和小麦中的最低检出浓度为0.02mg·kg-1.本方法的平均添加回收率为91.17-103.8%,变异系数为1.47-11.8%.应用上述方法,测定了单嘧磺隆在北京、山东两地土壤中的消解动态以及在土壤、小麦中的最终残留.结果表明:在北京土壤中的半衰期为9.24d;在山东土壤中的半衰期为13.59d;当按推荐剂量施药,小麦收获时,在土壤和小麦中,北京、山东两地均未检出单嘧磺隆.
关键词:
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单嘧磺隆
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土壤
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小麦
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残留分析
Abstract:
The method of residue analysis of monosulfuron which is a new sulfonylurea herbicides,its dissipation in soil,and final residue in soil and wheat were studied. Residues of monosulfuron were extracted from soil and wheat with methanol ammonium hydroxide(wheat with acetone water),purified by liquid liquid partition and C18 column,concentrated to a small volume,and then determided by HPLC equipped with UV detector.The average recoveries and coefficient of variation of the method were 91.17—103.8% and 1.47—11.8% respectively.The minimum detectable amount of monosulforon was 4ng,the minimum detectable concentration of monosulfuron in the samples of soil and wheat were 0.02mg·kg-1. The dissipation of monosulfuron in surface(0—15cm)soil and wheat in Shangdong and Beijing were determined with the method described above.The results showed that the half life of the two kinds of soil were about 9.24 days and 13.59 days respectively.When monosulfuron was applied according to the recommended dose,the final residue of monosulfuron in the soil and wheat was not determided.
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