中文摘要：

在北京和安徽两地开展了田间试验，研究二甲戊灵在土壤与马铃薯植株中的残留降解动态与残留水平。试验样品中的二甲戊灵用乙腈提取，分散固相萃取净化，采用GCMS法，选择离子模式监测（SIM）定量测定。二甲戊灵在马铃薯块茎、植株和土壤的添加回收率分别为84.5％～89.8％、91.5％～101％和78.7％～88.1％，相对标准偏差分别为4.8％～8.5％、6.2％～8.2％和5.2％～7.8％。结果表明，二甲戊灵在马铃薯植株与土壤中的降解动态符合一级动力学模型，在安徽（潮土）和北京（褐土）两地土壤中的半衰期分别为21.0和30.1d，在马铃薯植株中的半衰期分别为9.5和10.6d。收获后，马铃薯块茎中二甲戊灵的残留量小于0.0lmg·kg-1，低于欧盟规定的二甲戊灵在马铃薯中最大允许残留限量0.05mg·kg-1。研究结果为了解二甲戊灵在环境中的残留水平及食物链迁移转化提供了参考。

英文摘要：

The dynamics of residues and degradation of pendimethalin in soil and potato shoots in both Anhui provinces and Beijing were investigated in the field. The pesticides were extracted using solvent of acetonitrile, and the pesticides extracted from sample were separated and purified with dispersion solid phase extraction. The pesticides were finally detected by GCMS, quantified with selected ion monitoring （SIM） mode. The average recoveries of pendimethalin were 84. 5% ～ 89. 8% for potato tuber, 91.5% ～ 101% for potato shoots and 78. 7% ～ 88. 1% for soil, respectively, with relative standard deviation （RSD） of 4. 8% ～ 8.5%, 6.2% ～ 8.2% and 5.2% - 7. 8%, respectively, in potato tuber, shoots and soil. A field experiment was al so conducted to reveal the dynamics of pendimethalin residues in potato shoots and soil in the two provinces. The results showed that the half life of pendimethalin was 21.0 days, 30. 1 days in soil and 9. 5 days, 10. 6 days in potato shoots in Anhui （fluvo-aquic soils） and Beijing （cinnamon soil） respectively. After harvest, the residue of pendimethalin in potato tuber were less than 0. 01 mg · kg-land below EU maximum residue limits of 0. 05 mg· kg-1, The results provided reference to understand the residue level of pendimethalin in environment and transformation in the food chains.