...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Environmental Engineering >Effect of water saturation on retardation of ground-water contaminants
【24h】

Effect of water saturation on retardation of ground-water contaminants

机译：水分饱和度对地下水污染物滞后的影响

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 is the first to report the effect of water saturation on the retardation of nonionic organic compounds under dynamic conditions. Three nonaggregated sandy soil samples, that varied in their organic carbon content but had similar grain size distributions, were utilized. Two nonionic organic compounds were used: (1) dimethylphthalate, which served as a nonvolatile compound; and (2) benzene, which was volatile. Results showed that retardation coefficients for unsaturated soils are higher than those determined when the soil is saturated. The extent of deviation in retardation between the saturated and unsaturated soils generally increased as the degree of water saturation was reduced. No functional relationship between the extent of deviation in the retardation coefficient and the amount of organic carbon on the soil was found. When normalized to the saturated solid-to-water ratio, retardation coefficients for dimethylphthalate determined at different degrees of saturation were similar, leading to the conclusion that the distribution coefficient did not increase as the media was desaturated. Volatilization did not significantly affect the retardation of benzene under the employed range of saturation. Theoretical analysis showed that the impact would be significant for volatile compounds with higher Henry's coefficients and in aquifers with low organic matter content. Diffusive transport in the air phase had a significant impact on the spreading of benzene. Previously developed empirical relations reasonably predicted this impact.
机译：这项研究是第一个报道水饱和度在动态条件下对非离子有机化合物阻滞作用的研究。使用了三个非聚集的沙土样品，它们的有机碳含量各不相同，但粒度分布相似。使用了两种非离子有机化合物：（1）邻苯二甲酸二甲酯，它是一种非挥发性化合物; （2）易挥发的苯。结果表明，非饱和土壤的延迟系数要高于饱和土壤时的延迟系数。随着水饱和度的降低，饱和土壤和非饱和土壤之间的延迟偏差程度通常会增加。没有发现延迟系数的偏差程度与土壤中有机碳的含量之间存在函数关系。当归一化为饱和固水比时，在不同饱和度下测定的邻苯二甲酸二甲酯的阻滞系数相似，从而得出结论，当介质去饱和时，分配系数不会增加。在所采用的饱和范围内，挥发不会显着影响苯的延迟。理论分析表明，对于亨利系数较高的挥发性化合物和有机质含量较低的含水层，影响将是显着的。空气中的扩散运输对苯的扩散具有重大影响。先前建立的经验关系可以合理地预测这种影响。

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