Dielectric barrier discharge-induced chemiluminescence: potential application as GC detector.
Dielectric barrier discharge-induced chemiluminescence: potential application as GC detector.
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DOI：
10.1021/ac070321u
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发表时间：
2007-05
影响因子：
7.4
通讯作者：
Yihua He;Yi Lv;Yaming Li;Huarong Tang;Li Tang;Xi Wu;X. Hou
中科院分区：
文献类型：
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作者：
Yihua He;Yi Lv;Yaming Li;Huarong Tang;Li Tang;Xi Wu;X. Hou
大气压介质阻挡放电(DBD)等离子体可用于裂解低分子有机化合物，并将DBD裂解/激发态物质扫入鲁米诺溶液中诱导化学发光(CL)。基于这一观察结果，提出了一种新型的光学检测器，并在本工作中初步测试了其作为一种潜在的气相色谱(GC)检测器的潜力。这种新型检测器的优点包括：直接检测、快速响应、高灵敏度、通用性(对广泛的挥发性有机化合物敏感)、仪器简单易行、紧凑(3.0 mm内径。X 4.0 mm直径X 20 mm DBD器件长度)和低功率(小于5W)。用该检测器对甲醇、乙醇、丙醇、甲醛、乙醛、苯、二氯甲烷、三氯甲烷、四氯甲烷、四氢呋喃、二硫化碳、乙醚等12种挥发性有机化合物进行了检测，均产生了较大的信号。研究发现，化学发光信号与分析物浓度成正比，并受DBD参数的影响。在优化的实验条件下，对甲醇、乙醇、丙醇、甲醛和乙醛的检测下限可达数十纳克级。然后将其作为分离甲醛、乙醇和丙醇的GC检测器进行了初步测试。这是DBD在分析化学中的新应用，首次用这种方法产生了CL。该检测器可作为一种潜在的适用于多种挥发性有机化合物的GC检测器。
Atmospheric pressure dielectric barrier discharge (DBD) plasma can be used to split low molecular weight organic compounds, and the DBD-split/excited species can be swept into luminol solution to induce chemiluminescence (CL) emission. Based on this observation, a novel optical detector was proposed and preliminarily tested as a potential gas chromatographic (GC) detector in this work. The advantages of this new type of detector include the following: direct detection, fast response, high sensitivity, versatility (sensitive to a broad range of volatile organic compounds), simple and easy instrumentation, compactness (3.0 mm i.d. x 4.0 mm o.d. x 20 mm length of the DBD device), and low power (less than 5 W). Twelve volatile organic compounds, including methanol, ethanol, propanol, formaldehyde, acetaldehyde, benzene, dichloromethane, trichloromethane, tetrachloromethane, tetrahydrofuran, carbon bisulfide, and ethyl ether, were tested with this detector, and each of them produced a large signal. It was found that the CL signal was proportional to the analyte concentration and affected by the DBD parameters. Under the optimized experimental conditions, the limits of detection down to the tens of nanogram level were achieved for methanol, ethanol, propanol, formaldehyde, and acetaldehyde. It was then preliminarily tested as a GC detector for the separation of formaldehyde, ethanol, and propanol. This is the new application of DBD in analytical chemistry, and CL was for the first time generated in this way. The new detector can be a potential GC detector suitable for a wide range of volatile organic compounds.