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首页> 外文期刊>Environmental Science & Technology >Measurement of Gas-Accessible NAPL Saturation in Soil Using Gaseous Tracers
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Measurement of Gas-Accessible NAPL Saturation in Soil Using Gaseous Tracers

机译：使用气体示踪剂测量土壤中可及气体的NAPL饱和度

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摘要

In this laboratory study, a new experimental method involving the use of a set of four gaseous tracers, was developed for measuring the NAPL saturation directly accessible to the mobile gas as well as the total NAPL saturation in unsaturated sand. One tracer with low water solubility (n-pentane) was used as the tracer that partitions into NAPL directly accessible to the mobile gas, and another (chloroform) tracer with moderate water solubility and NAPL-partitioning, was selected for detecting total NAPL saturation. Helium and difluoromethane were used as the nonreactive and water-partitioning tracers, respectively. A saturated hydrocarbon, n-decane, was used as NAPL Column experiments were conducted at two water saturations (S_w = 0.68 and 0.16). The total NAPL saturation and NAPL saturation not directly accessible to the mobile gas were also successfully measured using the combined results of tracer experiments. At S_w = 0.68, only 28% of the total NAPL was detected by n-pentane, whereas 87% of the total NAPL was accessible to n-pentane at S_w = 0.16, implying more NAPL was accessible to the mobile gas phase at lower water saturation.
机译：在这项实验室研究中，开发了一种新的实验方法，其中涉及使用一组四个气态示踪剂，以测量可直接进入移动气体的NAPL饱和度以及不饱和砂中的总NAPL饱和度。使用一种水溶性低的示踪剂（正戊烷）作为示踪剂，将其分配到可直接进入移动气体的NAPL中，并选择另一种水溶性和NAPL分隔度适中的（氯仿）示踪剂来检测总NAPL饱和度。氦气和二氟甲烷分别用作非反应性示踪剂和水分配示踪剂。饱和烃正癸烷用作NAPL。在两个水饱和度（S_w = 0.68和0.16）下进行了柱实验。使用示踪剂实验的综合结果，也成功地测量了总NAPL饱和度和流动气体无法直接进入的NAPL饱和度。在S_w = 0.68时，正戊烷只能检测到总NAPL的28％，而在S_w = 0.16时正戊烷可以检测到总NAPL的87％，这意味着在较低水位下流动相可以接触到更多的NAPL饱和。

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  • 来源
    《Environmental Science & Technology》 |2007年第1期|p.235-241|共7页
  • 作者

    HEONKI KIM; KYONG-MIN CHOI; P. SURESH C. RAO;

  • 作者单位

    Department of Environmental Sciences and Biotechnology, Hallym University, Chuncheon, Gangwon-do, 200-702, Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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