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首页> 外文会议>Petroleum hydrocarbons conference and exposition >Forensic Geochemistry - The Key to Accurate Site Characterization
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Forensic Geochemistry - The Key to Accurate Site Characterization

机译：法医地球化学 - 准确遗址表征的关键

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The majority of environmental site investigations are conducted using a limited number of randomly placed boreholes and/or monitoring wells in an attempt to characterize the subsurface contamination. Although costs often dictate the approach and work plan executed during an investigation, the key to an accurate site characterization is the use of forensic geochemical techniques. A well formulated work plan including the use of forensic geochemical methods can accurately delineate subsurface contamination, and ultimately be more cost-effective. Surface geochemical techniques and high resolution capillary gas chromatography analyses can be used to map the locations, areal (horizontal) and vertical extents, and geometries of subsurface petroleum hydrocarbon contaminant plumes. Source areas, migration pathways and relative ages of products released on a site can also be determined. A case study is presented to demonstrate the value of various forensic geochemical techniques in the proper characterization of subsurface contamination. Previous environmental investigations conducted at a large refinery site, using randomly placed boreholes and monitoring wells, indicated a very large liquid crude oil contaminant plume along the south boundary of the facility. This plume was also projected to continue offsite into an adjacent residential area. When crude oil was discovered seeping into the adjacent bay, it was assumed the source was related to the south boundary plume. A surface geochemical soil vapor survey was initially conducted to delineate the areal extent of subsurface contaminant plumes on the facility. Over 3150 soil vapor samples were collected on a 30-meter (approximately 100-foot) grid encompassing 75% of the refinery. Soil vapor constituent (contoured) plume maps were constructed to determine the areal extent of different hydrocarbon compounds. Product type "signatures" were also determined using high resolution capillary gas chromatography (HRCGC) analyses performed on the soil vapor samples. High resolution soil vapor chromatorgrams showed several different petroleum products had been released on the refinery over a long period of time, and the contaminant plumes were discontinuous.
机译：大多数环境现场调查是使用有限数量的随机放置的钻孔和/或监测井进行的，试图表征地下污染。虽然成本通常决定在调查期间执行的方法和工作计划，但准确的现场表征的关键是使用法医地球化学技术。制定的工作计划包括使用法医地球化学方法可以准确地描绘地下污染，最终更具成本效益。表面地球化学技术和高分辨率毛细管气相色谱分析可用于映射地点，区域（水平）和垂直范围，以及地下石油烃污染物的几何形状。还可以确定在网站上发布的产品的源区，迁移途径和相对年龄。提出了一个案例研究以证明各种法医地球化学技术在适当表征地下污染中的价值。以前使用随机放置的钻孔和监测井进行的环境调查，指示了沿着设施南部边界的非常大的液体原油污染羽流。这种羽流量也被预计进入邻近的住宅区。当发现原油渗入相邻的湾时，假设源与南边界羽流有关。最初进行了表面地球化学土壤蒸气调查，以描绘了该设施上的地下污染羽毛的面积范围。在30米（约100英尺）的网格上收集超过3150个土壤蒸汽样品，包括75％的炼油厂。构建土壤蒸气成分（嵌合）羽毛图以确定不同烃类化合物的面积范围。还使用在土蒸汽样品上进行的高分辨率毛细管气相色谱（HRCGC）分析来确定产品类型“签名”。高分辨率土壤蒸汽致铬图显示出几种不同的石油产品在很长一段时间内释放出炼油厂，污染物羽毛不连续。

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