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首页> 外文会议>220th American Chemical Society, Meeting 2000 Washington, D.C. >Leaching of Post-Emergence Herbicides into Shallow Groundwater during Transition from Conventional Tillage to No-Tillage on Des Moines Lobe Soils of Central Iowa
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Leaching of Post-Emergence Herbicides into Shallow Groundwater during Transition from Conventional Tillage to No-Tillage on Des Moines Lobe Soils of Central Iowa

机译：在爱荷华州中部得梅因叶土壤上，从常规耕作到免耕过渡期间，芽后除草剂向浅层地下水的淋溶

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摘要

In a four-year field study carried out on a 96-ha field, we have evaluated the impact on shallow groundwater quality of transition from conventional-till to no-till for two herbicides now commonly used in minimum-till corn/soybean systems. Nicosulfuron and imazethapyr were studied. Well water samples were obtained from shallow piezometers using manual bailers and residue analyses carried out in our laboratory. Methods utilized SPE cartridge chemistry followed by HPLC/MS/MS techniques, providing a 10 part per-trillion quantitation limit in two-liters of filtered groundwater. By January of 1993, ten months following initial application, imazethapyr, nicosulfuron, and one nicosulfuron degradate had been detected in the well water and confirmed by MS/MS. During the 1993 through 1995 sampling seasons, average concentration in the piezometer samples was 131 and 125 part-per-trillion for nicosulfuron and imazethapyr, respectively. The data show that these widely used ALS-inhibiting chemicals are capable of leaching to shallow groundwater during tillage transition.
机译：在一个为期96公顷的田地上进行的为期四年的田间研究中，我们评估了目前在最低耕作玉米/大豆系统中常用的两种除草剂对从常规耕作到免耕过渡的浅层地下水水质的影响。对烟嘧磺隆和咪唑乙烟进行了研究。井水样品是从浅压计中使用手动取水器进行的，并在我们的实验室中进行了残留分析。方法利用了SPE柱化学法和HPLC / MS / MS技术，在两升过滤的地下水中提供了10万亿分之10的定量限。到1993年1月，在初次应用后十个月，已在井水中检测到咪唑乙烟，烟嘧磺隆和一种烟嘧磺隆降解物，并通过MS / MS进行了确认。在1993年至1995年的采样季节中，烟嘧磺隆和咪唑乙烟醚的压强计样品中的平均浓度分别为131和125 ppm。数据表明，这些广泛使用的ALS抑制化学物质能够在耕作过渡过程中浸出到浅层地下水中。

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