• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of environmental science and health >Sorption and predicted mobility of herbicides in Baltic soils
【24h】

Sorption and predicted mobility of herbicides in Baltic soils

机译：除草剂在波罗的海土壤中的吸附和预测的迁移率

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study was undertaken to determine sorption coefficients of eight herbicides (alachlor. amitrole, atrazine, simazine, dicamba, imazamox, imazethapyr, and pendimethalin) to seven agricultural soils from sites throughout Lithuania. The measured sorption coefficients were used to predict the susceptibility of these herbicides to leach to groundwater. Soil-water partitioning coefficients were measured in batch equilibrium studies using radiolabeled herbicides. In most soils, sorption followed the general trend pendimethalin ＞ alachlor ＞ atrazine～amitrole~simazine ＞ imazethapyr ＞ imazamox ＞ dicamba, consistent with the trends in hydropho-bicity (log K_(ow)) except in the case of amitrole. For several herbicides, sorption coefficients and calculated retardation factors were lowest (predicted to be most susceptible to leaching) in a soil of intermediate organic carbon content and sand content. Calculated herbicide retardation factors were high for soils with high organic carbon contents. Estimated leaching times under saturated conditions, assuming no herbicide degradation and no preferential water flow, were more strongly affected by soil textural effects on predicted water flow than by herbicide sorption effects. All herbicides were predicted to be slowest to leach in soils with high clay and low sand contents, and fastest to leach in soils with high sand content and low organic matter content. Herbicide management is important to the continued increase in agricultural production and profitability in the Baltic region, and these results will be useful in identifying critical areas requiring improved management practices to reduce water contamination by pesticides.
机译：这项研究的目的是确定立陶宛各地的八种除草剂（甲草胺，虫，阿特拉津，西玛津，麦草畏，咪唑莫克，咪唑乙哌和二甲戊灵）对七种农业土壤的吸附系数。测得的吸附系数用于预测这些除草剂对地下水的浸出敏感性。使用放射性标记的除草剂，在间歇平衡研究中测量了土壤水分配系数。在大多数土壤中，吸附的总体趋势是二甲戊乐灵＞甲草胺＞阿特拉津〜酰胺〜咪嗪＞咪唑乙烟醚＞咪唑莫克斯＞麦草畏，除疏水性外，与疏水性趋势（log K_（ow））一致。对于几种除草剂，在中等有机碳含量和含沙量的土壤中，吸附系数和计算出的阻滞因子最低（预计最容易被淋滤）。对于有机碳含量较高的土壤，计算得出的除草剂阻滞因子较高。假设没有除草剂降解且没有优先的水流，则在饱和条件下的估计浸出时间受土壤质地对预测水流的影响要比除草剂的吸附作用更为强烈。预测所有除草剂在高粘土和低沙含量的土壤中浸出最慢，而在高沙含量和低有机质含量的土壤中浸出最快。除草剂管理对波罗的海地区农业生产和利润的持续增长很重要，这些结果将有助于确定需要改进管理措施以减少农药对水污染的关键地区。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号