Hyperthermal Negative Surface Ionization Applied to the Detector for Gas Chromatography

采用高温负表面电离（HNSI）技术，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中醇类和酚类的灵敏和选择性检测。这种设计的独特性质允许检测这些含氧化合物，而据报道，传统npd对这些含氧化合物几乎没有反应。本报告描述了HNSI在传统NPD中的应用。新设计的检测器被称为new-NPD，在实验条件下，由于样品分子携带动能，表面保持在低功函数状态。我们报告了我们对酒精和苯酚分析的新npd的评估。对正戊醇和苯酚的灵敏度分别为8.5 X 10^<-1>和2.6 X 10^0库仑/g，线性范围均大于1 X 10^5。最小可检测水平在10^<-13>g/s范围内。与火焰电离检测器（FID）相比，新NPD对醇类和酚类的敏感度大约高出100倍，具体取决于特定的物质种类。

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.