Hyperthermal Negative Surface Ionization Applied to the Detector for Gas Chromatography

基于高温表面负电离(HNSI)原理，设计了一种新型氮磷气相色谱检测器(NPD)，用于毛细管气相色谱灵敏、选择性地检测醇类和酚类化合物。这种设计的独特性质使得能够检测到这些含氧化合物，据报道，传统的NPD对这些化合物几乎没有反应。本文描述了HNSI在常规NPD中的应用。新设计的探测器被称为新NPD，它在实验条件下工作，由于样品分子携带动能，表面保持低功函数状态。我们报告了我们对用于酒精和苯酚分析的新的NPD的评估。对正戊醇和苯酚的灵敏度分别为8.5×10~(-1)和2.6×10~(-0)库仑/克，线性范围均大于1×10~(-5)。最低检测水平为10^~(-13)g/S。与火焰离子化检测器(FID)相比，新的NPD对乙醇和苯酚的灵敏度约为100倍，具体取决于不同的物种。

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.