CHARACTERISTICS OF A NOVEL ALKALI FLAME IONIZATION DETECTOR AS AN AIR SENSOR FOR VOLATILE ORGANO-NITROGEN COMPOUNDS

IF 1.1 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Cole M. Mogenson, K. Thurbide
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引用次数: 0

Abstract

A novel alkali flame ionization detector (AFID) is introduced and characterized for use as an air sensor (i.e. without chromatographic separation) for organo-nitrogen compounds. Using a planar channeled quartz design, a simple, lightweight architecture for the portable device is presented, which yields sensitive and selective response toward nitrogen-containing analytes. For instance, the AFID sensor offers a detection limit of 30 pg N/s and a selectivity for nitrogen response over carbon of nearly 2 orders of magnitude. Further, nitrogen response is linear over the 1000-fold range of concentrations investigated. Relative to a flame photometric detector (FPD) device also used in a sensor mode, the AFID is observed to provide 100 times greater S/N values for nitrogen analytes with a nitrogen to carbon selectivity that is about 15 times larger. When using the AFID and FPD sensors in tandem, it is found that the response ratio of the simultaneous signals generated by each, produces characteristic values that more clearly identify the presence or absence of nitrogen in unknown analytes. The AFID sensor was used to detect organo-nitrogen analytes in several samples, and results indicate that it could be a useful approach for portable air sensing of nitrogen compounds.
一种新型碱火焰电离检测器作为挥发性有机氮化合物的空气传感器的特性
介绍了一种新型碱火焰电离检测器(AFID),并对其进行了表征,用于有机氮化合物的空气传感器(即无需色谱分离)。采用平面通道石英设计,提出了一种简单,轻量级的便携式设备结构,对含氮分析物产生敏感和选择性的响应。例如,AFID传感器的检测限为30 pg N/s,对氮响应的选择性比碳高近2个数量级。此外,氮的响应在1000倍的浓度范围内是线性的。与同样用于传感器模式的火焰光度检测器(FPD)相比,AFID对氮分析物的S/N值提高了100倍,氮对碳的选择性提高了约15倍。当串联使用AFID和FPD传感器时,发现每个传感器同时产生的信号的响应比产生的特征值更清楚地识别未知分析物中是否存在氮。利用AFID传感器对几种样品中的有机氮进行了检测,结果表明该传感器可作为便携式空气中氮化合物检测的一种有效方法。
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来源期刊
Canadian Journal of Chemistry
Canadian Journal of Chemistry 化学-化学综合
CiteScore
1.90
自引率
9.10%
发文量
99
审稿时长
1 months
期刊介绍: Published since 1929, the Canadian Journal of Chemistry reports current research findings in all branches of chemistry. It includes the traditional areas of analytical, inorganic, organic, and physical-theoretical chemistry and newer interdisciplinary areas such as materials science, spectroscopy, chemical physics, and biological, medicinal and environmental chemistry. Articles describing original research are welcomed.
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