Using vapor phase tomography to measure the spatial distribution of vapor concentrations and flux for vadose-zone VOC sources.
Using vapor phase tomography to measure the spatial distribution of vapor concentrations and flux for vadose-zone VOC sources.
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DOI：
10.1016/j.jconhyd.2015.03.002
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发表时间：
2015-06
影响因子：
3.6
通讯作者：
Brusseau, M. L.
中科院分区：
文献类型：
--
作者：
Mainhagu, J.;Morrison, C.;Brusseau, M. L.
在亚利桑那州图森市的一个氯化溶剂污染场地进行了一项测试，以评估气相层析成像（VPT）用于表征包气带中挥发性有机污染物（VOC）分布的有效性。自2007年以来，土壤蒸汽提取（SVE）系统一直在现场运行。在抽取井周围的四个监测威尔斯井中的每一个中的四个不同深度处测量蒸气浓度和真空压力。该测试提供了诱导梯度条件下局部蒸汽浓度的3D表征。从钻孔日志分析获得的渗透率数据与蒸汽浓度数据相结合，以确定测试域内的VOC质量通量。一个区域的较高的质量通量被确定在最深的间隔的S-SW部分的域，表明一个区域的可能位置具有更大的污染物质量。这些结果与从现场进行的沉积物取芯获得的三氯乙烯浓度分布一致。与此相反，标准土壤气体调查的结果并没有表明存在一个污染物质量更大的区域。这些结果表明，VPT测试提供了一个强大的表征挥发性有机化合物的浓度和流量分布在网站上。
A test was conducted at a chlorinated-solvent contaminated site in Tucson, AZ, to evaluate the effectiveness of vapor-phase tomography (VPT) for characterizing the distribution of volatile organic contaminants (VOC) in the vadose zone. A soil vapor extraction (SVE) system has been in operation at the site since 2007. Vapor concentration and vacuum pressure were measured at four different depths in each of four monitoring wells surrounding the extraction well. The test provided a 3D characterization of local vapor concentrations under induced-gradient conditions. Permeability data obtained from analysis of borehole logs were combined with the vapor-concentration data to determine VOC mass flux within the test domain. A region of higher mass flux was identified in the deepest interval of the S-SW section of the domain, indicating the possible location of a zone with greater contaminant mass. These results are consistent with the TCE-concentration distribution obtained from sediment coring conducted at the site. In contrast, the results of a standard soil gas survey did not indicate the presence of a zone with greater contaminant mass. These results indicate that the VPT test provided a robust characterization of VOC concentration and flux distribution at the site.
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影响因子：
1.9
作者：
Carroll, Kenneth C.;Truex, Michael J.;Rohay, Virginia J.
通讯作者：
Rohay, Virginia J.
影响因子：
3.6
作者：
Brusseau, M. L.;Matthieu, D. E., III;Carroll, K. C.;Mainhagu, J.;Morrison, C.;McMillan, A.;Russo, A.;Plaschke, M.
通讯作者：
Plaschke, M.
影响因子：
8.8
作者：
Matthieu DE 3rd;Brusseau ML;Johnson GR;Artiola JL;Bowden ML;Curry JE
通讯作者：
Curry JE
影响因子：
5.4
作者：
Brauchler, R;Liedl, R;Dietrich, P
通讯作者：
Dietrich, P
影响因子：
4.7
作者：
Ni, Chuen-Fa;Yeh, Tian-Chyi Jim
通讯作者：
Yeh, Tian-Chyi Jim