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首页> 外文期刊>Environmental Science & Technology >Comparison of Two Field Sampling Procedures (En Core and Field Methanol Extraction) for Volatile Organic Compounds
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Comparison of Two Field Sampling Procedures (En Core and Field Methanol Extraction) for Volatile Organic Compounds

机译：挥发性有机化合物的两种现场采样程序（En Core和现场甲醇萃取）的比较

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摘要

In-situ Lasagna technology was recently evaluated at a contaminated site at Offutt Air Force Base. The site was contaminated with low levels (<30 mg/kg) of volatile organic compounds (VOCs). Originally, researchers planned to use field methanol extraction for both pre- and post-treatment sampling to evaluate the effectiveness of the technology on contaminant reduction. Precharacterization sampling, however, indicated that concentrations of some contaminants of concern were much lower than expected. Because use of methanol increases the detection limit, it was probable that post-treatment concentrations of these target contaminants would be nondetectable if methanol extraction was used. Project management, therefore, decided to use En Core samplers in addition to field methanol extraction during the pretreatment sampling event. The En Core sampling approach, while yielding a lower detection limit, uses discreet samples along the length of a core, whereas the methanol extraction approach samples the entire length of the core. The concern was that discreet samples may bias results if any "hot spots" were present. The two field sampling procedures, En Core and field methanol extraction, were performed side-by-side during the pretreatment phase of the technology evaluation in order to determine if the concern was valid for this site. Results were compared for four contaminants of concern: trichloroethylene, vinyl chloride, cis-1,2-dichloroethene, and trans-1,2-dichloroethene. The two procedures produced similar results with respect to both the concentration means and the variances, and no bias was evident. This finding supports project management's decision to use only En Core samplers post-treatment due to low concentrations of target contaminants.
机译：最近，在Offutt空军基地的一个受污染场地评估了现场烤宽面条技术。该场所被低水平（<30 mg / kg）的挥发性有机化合物（VOC）污染。最初，研究人员计划在处理前和处理后的采样中使用现场甲醇萃取，以评估该技术在减少污染物方面的有效性。但是，表征前的抽样表明，一些令人关注的污染物的浓度远低于预期。由于使用甲醇会增加检测限，因此如果使用甲醇萃取，很可能无法检测到这些目标污染物的后处理浓度。因此，项目管理人员决定在预处理采样活动中，除现场甲醇提取外，还使用En Core采样器。 En岩心采样方法虽然产生了较低的检测限，但沿岩心长度使用了离散的样本，而甲醇萃取法则对岩心的整个长度进行了采样。担心的是，如果存在任何“热点”，谨慎的样本可能会使结果有偏差。在技​​术评估的预处理阶段，并排执行了两种现场采样程序，即En Core和现场甲醇提取，以确定该问题是否对该站点有效。比较了所关注的四种污染物的结果：三氯乙烯，氯乙烯，顺式1,2-二氯乙烯和反式1,2-二氯乙烯。两种方法在浓度平均值和方差方面均产生了相似的结果，并且没有明显的偏差。这一发现支持了项目管理者的决定，因为目标污染物的浓度较低，因此仅在处理后使用En Core采样器。

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