Hyperthermal Negative Surface Ionization Applied to the Detector for Gas Chromatography

将一种基于超热负表面离子化（HNSI）原理的新型氮磷气相色谱检测器（NPD）应用于毛细管气相色谱中，对醇类和酚类化合物进行了灵敏、选择性的检测。这种设计的独特性质允许检测这些含氧化合物，据报道，传统的NPD几乎没有反应。本文介绍了HNSI在传统NPD中的应用，新设计的NPD探测器（简称新NPD）是在实验条件下工作的，当样品分子携带动能时，表面保持在低功函数状态。我们报告我们的新的NPD的评价，为阿斯科醇和苯酚分析。对正戊醇和苯酚的灵敏度分别为8.5 × 10^0<-1>库仑/g和2.6 × 10^0库仑/g，这两种化合物的线性范围均大于1 × 10^5。最低可检测水平在10 μ <-13>g/s范围内。与火焰离子化检测器（FID）相比，新的NPD对不同种类的酚类化合物的灵敏度提高了100倍。

A new design of nitrogen-phosphorous gas chromatographic detector (NPD), based upon hyperthermal negative surface ionization (HNSI), was used in capillary gas chromatography to sensitively and selectively detect alcohols and phenols. The unique properties of this design allowed detection of these oxygen-containing compounds to which conventional NPDs are reported to have little response. This report describes the application of HNSI to a conventional NPD.The newly-designed detector, referred to as a new-NPD,was operated under experimental conditions where the surface was kept at a low-work-function state as the sample molecules carried kinetic energy. We report our evaluation of the new-NPD for ascohol and phenol analysis. The sensitivity to n-pentanol and phenol was 8.5 X 10^<-1> and 2.6 X 10^0 Coulomb/g, respectively, with a linear range of operation greater than 1 X 10^5 for both these compounds. The minimum detectable level was in the range of 10^<-13>g/s. Compared with a flame ionization detector (FID), the new NPD was about 100 times more sesitive to ascohols and phenols, depending on the particular species.