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首页> 外文期刊>Environmental Science & Technology >On-Site Profiling and Speciation of Polycyclic Aromatic Hydrocarbons at Manufactured Gas Plant Sites by a High Temperature Transfer Line, Membrane Inlet Probe Coupled to a Photoionization Detector and Gas Chromatograph/Mass Spectrometer
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On-Site Profiling and Speciation of Polycyclic Aromatic Hydrocarbons at Manufactured Gas Plant Sites by a High Temperature Transfer Line, Membrane Inlet Probe Coupled to a Photoionization Detector and Gas Chromatograph/Mass Spectrometer

机译：通过高温传输线，膜入口探针与光电离检测器和气相色谱/质谱仪耦合，在天然气工厂现场对多环芳烃进行现场分析和形态分析

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A new high temperature transfer line, membrane inlet probe (HTTL-MIP) coupled to a photoionization detector (PID) and gas chromatograph/mass spectrometer (GC/MS) was used to rapidly profile and speciate polycyclic aromatic hydrocarbons (PAH) in the subsurface. PID signals were in agreement with GC/MS results. Correlation coefficients of 0.92 and 0.99 were obtained for discrete and composite samples collected from the same exact location. Continuous probe advancement with PID detection found coal tar, a dense nonaqueous phase liquid, in soil channels and saturated media. When samples were collected conventionally, split, solvent extracted, and analyzed in the field and confirmation laboratory, GC/MS measurement precision and accuracy were indistinguishable; despite the fact the field laboratory produced data five times faster than the laboratory using standard EPA methods. No false positiveegatives were found. Based on these findings, increased confidence in site conceptual models should be obtained, since PID response indicated total PAH presence/ absence in "real-time," while GC/MS provided information as to which PAH was present and at what concentration. Incorporation of this tool into a dynamic workplan will provide more data at less cost enabling environmental scientists, engineers, and regulators to better understand coal tar migration and its impact on human health and the environment.
机译：新的高温传输线，膜入口探针（HTTL-MIP）与光电离检测器（PID）和气相色谱/质谱仪（GC / MS）耦合，用于快速分析和鉴定地下多环芳烃（PAH） 。 PID信号与GC / MS结果一致。从同一精确位置收集的离散样本和复合样本的相关系数分别为0.92和0.99。通过PID检测的连续探测进展发现了土壤通道和饱和介质中的煤焦油（一种稠密的非水相液体）。当按常规方式收集样品，分流，萃取溶剂并在现场和确认实验室进行分析时，GC / MS的测量精度和准确度难以区分。尽管实地实验室产生的数据比使用标准EPA方法的实验室快五倍。没有发现假阳性/阴性。基于这些发现，应该提高对现场概念模型的信心，因为PID响应指示“实时”存在总的PAH /不存在，而GC / MS提供有关存在哪些PAH以及浓度的信息。将此工具整合到动态工作计划中，将以更低的成本提供更多数据，使环境科学家，工程师和监管机构能够更好地了解煤焦油迁移及其对人类健康和环境的影响。

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