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为了准确评价氟磺胺草醚残留对后茬作物及生态环境的影响,较系统地研究了土壤中氟磺胺草醚残留的分析方法。研究确立了二氯甲烷-水-冰乙酸振荡提取土壤中氟磺胺草醚残留的样品前处理方法,建立了高效液相色谱分析检测方法。结果显示,氟磺胺草醚在0.1~10.0 mg·L-1质量浓度范围内线性响应良好,回归方程为y=1.316 9 x+0.132 6,R2=0.999 6,氟磺胺草醚在供试土壤中3个添加水平的平均添加回收率为78.8%~104.4%,各添加水平3次重复的相对标准偏差均小于8%。该色谱条件下氟磺胺草醚的仪器最低检出量为0.031 mg·L-1,所建立残留分析方法的最低检出量为0.06 mg·L-1。该方法简便、经济、快速、灵敏,适于土壤中氟磺胺草醚残留量的检测。
In order to accurately evaluate the influence of fomesafen residues on the following crops and the ecological environment, the analytical methods of fomesafen residues in soil were systematically studied. A sample pretreatment method was established for the extraction of fomesafen residues in the soil with dichloromethane-water-glacial acetic acid. The method for the determination of fomesafen residues in soil by HPLC was established. The results showed that the linear response of fomesafen in the concentration range of 0.1-10.0 mg · L-1 was good, the regression equation was y = 1.316 9 x + 0.132 6, R2 = 0.999 6, fomesafen in the test soil The average recoveries of three addition levels ranged from 78.8% to 104.4%. The relative standard deviations (RSDs) of three replicates at each level were less than 8%. Under the chromatographic conditions, the lowest detection limit of fomesafen was 0.031 mg · L-1, and the minimum detection limit was 0.06 mg · L-1. The method is simple, economical, rapid and sensitive, and is suitable for the detection of fomesafen residues in soil.