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Field Evaluation of an Automated-Gas Chromatograph System for Monitoring Volatile Organic Compounds (VOCs) in Ambient Air

机译:用于监测环境空气中挥发性有机化合物(VOC)的自动气相色谱系统的现场评估

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Since installation of APCD's air toxics auto-GC, much has been learned about the operation and stability of the system. C_6-C_(12) BP-1 column retention times exhibited satisfactory stability while C_3-C_6 PLOT column retention times exhibited unfavorable shifting most likely due to poor moisture management. To address the humidity effects on PLOT column retention times, the Nafion® dryers were recently placed under vacuum during Phase 1 system modifications. Early results in the field do not demonstrate the desired retention time stabilization from this moisture management modification, but further evaluation is ongoing. VOC compound coelution is not a significant concern with the C_3-C_6 GC. In Spring 2019 (Phase 2 modifications), a 60-meter column will replace the 30-meter C_6-C_(12) BP-1 column to achieve greater separation between VOCs, which is expected to reduce the number of coeluting compounds. During biweekly checks, all system parameters met target values except column temperatures. In the second phase of modifications, the GC ovens will be redesigned to improve column temperature accuracy. All of these modifications have been or will be applied to the PAMS Chromatotec auto-GC systems.
机译:自从安装APCD的空气有毒物质自动气相色谱仪以来,已经学到了很多有关系统的操作和稳定性的知识。 C_6-C_(12)BP-1色谱柱的保留时间表现出令人满意的稳定性,而C_3-C_6 PLOT色谱柱的保留时间表现出不利的偏移,这很可能是由于水分管理不善所致。为了解决湿度对PLOT色谱柱保留时间的影响,Nafion®干燥机最近在第一阶段系统改造过程中被置于真空中。该领域的早期结果并未证明该水分管理方法具有所需的保留时间稳定性,但仍在进行进一步评估。对于C_3-C_6 GC,VOC化合物共洗脱不是一个重要的问题。在2019年春季(第二阶段修改)中,将使用60米的色谱柱代替30米的C_6-C_(12)BP-1色谱柱,以实现更大的VOC分离,这有望减少共洗脱化合物的数量。在每两周检查期间,除色谱柱温度外,所有系统参数均达到目标值。在修改的第二阶段,将对GC柱箱进行重新设计,以提高色谱柱温度的准确性。所有这些修改已经或将应用于PAMS Chromatotec自动GC系统。

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