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Applications of Portable GC/Purge-and-Trap in Field Analysis

机译:便携式GC /吹扫捕集在现场分析中的应用

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A portable gas chromatography (GC) was used to define the shallow and top of rock ground-water contamination plume at a site in North Carolina. The GC analyses enabled the engineer to design a costefficient and accurate system of permanent monitoring wells, instead of random placement. Historical data of this site indicated the presence of tetrachloroethene (PCE), with trichloroethene (TCE) and cis-1,2-dichloroethene (cis-1,2) as lesser constituents. The GC was equipped with a 30-meter fused silica/steel capillary column which completely resolved these analytes and a surrogate compound. The surrogate recovery provided immediate feedback on the analytical run and enhanced the on-site quality assurance objectives. A purge-and-trap assessory with carbon adsorbent was used for the analysis of the water samples. Field values agreed with conventional laboraotry volatile analysis. Soil samples taken at the site were also analyzed with the GC using a modified aqueous extraction procedure. This consisted of using a portable balance to weigh 4-6 grams of soil into a standard 40 milliliter water vial followed by adding sufficient reagent water to eliminate headspace. Afte ragitation for 15 seconds, an aliquot of the solution was analyzed as a water sample. Some falose negative results from the traditional analytical methods were inducated when compared to the field generated data. Although in situ methods of collection and analysis of media would provide more representative values, this aqueous extraction of minimally disturbed soils proved simple, reliable and required no special equipment. Future plans include an expansion of the analyte list and a more exhaustive comparison of soil collection and analysis techniques.
机译:使用便携式气相色谱仪(GC)来确定北卡罗来纳州某处岩石地下水污染羽流的浅层和顶部。 GC分析使工程师能够设计一种经济高效且准确的永久监控井系统,而不是随机放置。该场所的历史数据表明存在四氯乙烯(PCE),其中三氯乙烯(TCE)和顺式1,2-二氯乙烯(顺式1,2)为次要成分。 GC配有30米的熔融石英/钢毛细管柱,可完全分离这些分析物和替代化合物。替代品回收可立即提供有关分析运行的反馈,并提高了现场质量保证目标。用碳吸附剂进行的吹扫捕集评估用于分析水样。字段值与常规实验室挥发分析一致。还使用改进的水提取程序通过GC对现场采集的土壤样品进行了分析。这包括使用便携式天平将4-6克土壤称重到标准40毫升水瓶中,然后添加足够的试剂水以消除顶部空间。磨碎15秒后,分析溶液的等分试样作为水样品。与现场生成的数据相比,可以得出传统分析方法产生的一些负面结果。尽管就地收集和分析介质的方法将提供更具代表性的价值,但这种对水体的最小干扰土壤的萃取方法被证明是简单,可靠的,并且不需要任何特殊设备。未来的计划包括扩大分析物列表,并更详尽地比较土壤收集和分析技术。

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