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首页> 外文期刊>Ground Water Monitoring & Remediation >Spatial Variability Of Soil-gas Concentrations Nearand Beneath A Building Overlying Shallowrnpetroleum Hydrocarbon-impacted Soils
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Spatial Variability Of Soil-gas Concentrations Nearand Beneath A Building Overlying Shallowrnpetroleum Hydrocarbon-impacted Soils

机译：浅层石油对碳氢化合物影响的建筑物附近和建筑物下方土壤气体浓度的空间变异性

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Data requirements for assessing the significance of the soil vapor intrusion pathway are evolving, and the collection and interpretation of subslab and near-slab soil-gas samples are under discussion. The potential for different assessment paradigms for aerobically biodegradable and recalcitrant chemicals is also frequently debated. In this work, the soil-gas distribution beneath and around a slab-on-grade building overlying shallow (0.5 to >1.5 m below ground surface) petroleum hydrocarbon-impacted coarse alluvial soils was studied. The study spanned about 12 months, including the sampling of soil-gas hydrocarbon and oxygen concentrations, subslab soil vs. building pressure differentials and included weather conditions. Three-dimensional soil-gas concentration "snapshots" using samples from 79 soil-gas sampling points are presented here. Significant spatial variability was observed with hydrocarbon and oxygen concentrations ranging from about <0.01 to 200 mg/L and 0 to 21% v/v, respectively. The presence of oxygen and the depth to petroleum-impacted soils appeared to be the dominant factors in controlling the soil-gas distribution; the depletion of hydrocarbons over short lateral and vertical distances (<2 m) was observed in the well-oxygenated regions. Composition data suggest preferential biodegradation of lighter compounds at some points, as reflected in the ratio of the masses of chemicals eluting on the gas chromatography between methane and pentane (C1 and C5) and all others after pentane (>C5).
机译：评估土壤蒸汽侵入途径重要性的数据要求正在发展，并且正在讨论亚平板和近平板土壤-气体样品的收集和解释。需氧可生物降解和难降解化学品的不同评估范式的潜力也经常引起争议。在这项工作中，研究了在浅层（地下0.5到> 1.5 m）受石油碳氢化合物影响的粗冲积土上的平板建筑下面和周围的土壤-气体分布。这项研究历时约12个月，包括对土壤气中碳氢化合物和氧气浓度的采样，地下平板土壤与建筑的压力差以及天气情况。这里展示了使用来自79个土壤气体采样点的样本的三维土壤气体浓度“快照”。碳氢化合物和氧气的浓度分别在<0.01至200 mg / L和0至21％v / v的范围内观察到显着的空间变异性。氧气的存在和受石油影响的土壤的深度似乎是控制土壤气体分布的主要因素。在充氧良好的区域内，在短的横向和垂直距离（<2 m）上观察到碳氢化合物的消耗。组成数据表明，在某些情况下，较轻的化合物会发生优先的生物降解，这反映在气相色谱上甲烷和戊烷（C1和C5）以及戊烷（> C5）之后所有其他化合物之间洗脱的化学物质的质量比。

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