• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental toxicology and chemistry >CONSTRUCTION OF A REACTIVE SURFACE BARRIER TO REDUCE FUMIGANT 1,3-DICHLOROPROPENE EMISSIONS
【24h】

CONSTRUCTION OF A REACTIVE SURFACE BARRIER TO REDUCE FUMIGANT 1,3-DICHLOROPROPENE EMISSIONS

机译：活性表面屏障的构建，以减少有害的1,3-二氯丙烯排放

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

Halogenated fumigants have been used extensively in production agriculture to control soilborne pests. These types of pesticides are highly volatile and are prone to affect air quality and imperil public health. In the present study, a chemical tarp approach, termed a reactive surface barrier (RSB), was developed to reduce the emission of fumigant 1,3-dichloropropene (1,3-D) from the soil surface. The agrochemicals thiourea and allylthiourea were tested as active reagents for the construction of a RSB, where these soil amendments react with 1,3-D to form nonvolatile isothiuronium ions at the soil surface and, thereby, impede fumigant emission into the atmosphere. The feasibility of the method largely depends on the reactivity of 1,3-D and the RSB agrochemicals in soil as well as on the mobility, persistence, and toxicity of the transformation products. Therefore, the reaction kinetics and transformation mechanism of 1,3-D by thiourea and allylthiourea were studied comprehensively in aqueous solution and soil. A catalytic process occurring at the surface of soil colloids facilitated the reaction between 1,3-D and thiourea in amended soils. The rate of 1,3-D transformation in thiourea-amended soil increased with decreasing soil moisture or increasing thiourea amendment level. In a field trial, a thiourea RSB reduced cumulative 1,3-D emissions by more than 80% relative to that in bare soil surface. The present results clearly indicate that this chemical remediation technology has great potential to control the emissions of volatile halogenated organic contaminants and to mitigate atmospheric pollution.
机译：卤化熏蒸剂已在生产农业中广泛用于控制土壤传播的害虫。这些类型的农药挥发性高，容易影响空气质量并危害公共健康。在本研究中，开发了一种化学防水布方法，称为反应性表面屏障（RSB），以减少土壤表面熏蒸剂1,3-二氯丙烯（1,3-D）的排放。测试了农用化学品硫脲和烯丙基硫脲作为构建RSB的活性试剂，其中这些土壤改良剂与1,3-D反应，在土壤表面形成不挥发的异硫脲鎓离子，从而阻止熏蒸剂排放到大气中。该方法的可行性主要取决于1,3-D和RSB农用化学品在土壤中的反应性以及转化产物的迁移率，持久性和毒性。因此，全面研究了硫脲和烯丙基硫脲在水溶液和土壤中1,3-D的反应动力学和转化机理。在土壤胶体表面发生的催化过程促进了改良土壤中1,3-D与硫脲之间的反应。硫脲改良土壤中的1,3-D转化速率随着土壤湿度的降低或硫脲改良水平的提高而增加。在现场试验中，硫脲RSB相对于裸露的土壤表面而言，将1,3-D累积排放量降低了80％以上。目前的结果清楚地表明，这种化学修复技术具有控制挥发性卤代有机污染物排放和减轻大气污染的巨大潜力。

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