...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental toxicology and chemistry >Obtaining quantitative vapor emissions estimates of polychlorinated biphenyls and other semivolatile organic compounds from contaminated sites.
【24h】

Obtaining quantitative vapor emissions estimates of polychlorinated biphenyls and other semivolatile organic compounds from contaminated sites.

机译：从污染场所获得定量的多氯联苯和其他半挥发性有机化合物的蒸气排放估算值。

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

Soils contaminated with polychlorinated biphenyls (PCBs) and other semivolatile organic compounds (SVOCs) represent a potentially major, ongoing source of these compounds to the environment, especially during warmer temperatures. A great deal of work has been devoted to understanding the mechanisms that govern the vaporization of SVOCs from soil, but to date, few quantitative estimates have been published regarding emissions from contaminated sites. The present paper describes methods for obtaining quantitative estimates of SVOCs from soils based on flux chamber measurements, modeling, and ambient air measurements. On wet (i.e., H2O) soils, SVOCs at very low chemical loading levels on the adsorption sites (the so-called critical chemical concentration, critical loading, or saturation concentration) will behave, for volatilization purposes, as the pure-liquid substance would. For one soil, the PCB critical concentration was determined to be 775 ppm (95% confidence interval, 5.40E+02). Flux chamber-measured emissions from two contaminated sites were used and compared to model estimated values. The results agree reasonably well and indicate that the modeling approach used provided a conservative upper bound on the emissions. These approaches can be used to develop emissions estimates for SVOC-contaminated sites and inputs to air dispersion models.
机译：受多氯联苯（PCB）和其他半挥发性有机化合物（SVOC）污染的土壤是这些化合物向环境中潜在的主要持续来源，尤其是在温暖的温度下。为了了解控制土壤中SVOC蒸发的机理，已经进行了大量工作，但是迄今为止，关于污染场地排放物的定量估计尚未发表。本文介绍了基于通量室测量，建模和环境空气测量从土壤中获得SVOC的定量估计值的方法。在湿的（即H2O）土壤上，出于挥发目的，SVOC在吸附位点上的化学负荷非常低（所谓的临界化学浓度，临界负荷或饱和浓度）的行为会像纯液体物质一样。对于一种土壤，PCB的临界浓度确定为775 ppm（95％置信区间，5.40E + 02）。使用了来自两个受污染地点的通量室测量的排放，并将其与模型估计值进行了比较。结果相当吻合，表明所使用的建模方法为排放量提供了一个保守的上限。这些方法可用于为受SVOC污染的地点开发排放估算，并为空气扩散模型提供输入。

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