Portable gas chromatograph with tunable retention and sensor array detection for determination of complex vapor mixtures
Portable gas chromatograph with tunable retention and sensor array detection for determination of complex vapor mixtures
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DOI：
10.1021/ac026092n
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发表时间：
2003-03-15
影响因子：
7.4
通讯作者：
Zellers, ET
中科院分区：
文献类型：
--
作者：
Lu, CJ;Whiting, J;Zellers, ET
介绍了一种便携式气相色谱仪样机，它由多个吸附剂预浓集器/聚焦器、具有独立柱温控制和结点压力调制的串联柱分离级和由集成阵列的聚合物涂层表面声波微传感器组成的检测器组成。使用预定的第一柱停流间隔和两个柱的独立温度编程，可以调整洗脱分析物蒸气的保留，以最大限度地利用微传感器阵列识别蒸气，并最大限度地减少分析时间。保留窗口方法与蒙特卡罗模拟相结合，以指导保留调整要求并促进模式识别分析。以环境空气为载气，在10分钟内对30种常见室内空气污染物混合物进行了测定。基于阵列中最灵敏的传感器，对1-L空气样本中的大多数化合物的检测下限达到了<；10 ppb。性能评估是在近乎实时的室内空气质量监测应用的背景下进行的。
A prototype portable gas chromatograph that combines a multiadsorbent preconcentrator/focuser, a tandem-column separation stage with individual column temperature control and junction point pressure modulation, and a detector consisting of an integrated array of polymer-coated surface acoustic wave microsensors is described. Using scheduled first-column stop-flow intervals and independent temperature programming of the two columns, it is possible to adjust the retention of eluting analyte vapors to maximize vapor recognition with the microsensor array and minimize the time of analysis. A retention window approach is combined with Monte Carlo simulations to guide retention tuning requirements and facilitate pattern recognition analyses. The determination of a 30-vapor mixture of common indoor air contaminants in < 10 min is demonstrated using ambient air as the carrier gas. Detection limits of < 10 ppb are achieved for the majority of compounds from a 1-L air sample on the basis of the most sensitive sensor in the array. Performance is assessed in the context of near-real-time indoor air quality monitoring applications.