快速扫描紫外—可见光探测器及其在气相色谱仪和色—质仪中的应用

A Fast Scanning UV-VIS Detector and its Applications in GC and GC/MS

本文介绍快速扫描紫外—可见光探测器在毛细气相色谱仪和色—质仪中的应用(GC/UV,GC/UV/MS)。本探测器可在紫外光区域(190nm-365nm)和可见光(366nm-800nm)作快速扫描。GC/UV不仅给出色谱图,还可得到吸收谱。在 GC/UV/MS 中可给出化合物结构信息,特别对同分异构体具有良好的分辨性能。样品室工作温度在室温-350℃之间,能满足作绝大多数 GC 以及 GC/MS 对温度的要求,不产生冷点。单一波长模式噪声优于1×10~5Av,快速模式噪声优于5×10~5A_F。对氧杂萘邻酮(coumarin)的最小探测限为40pg/s。动态范围优于10~4。本仪器操作简便,适用于芳香族及其它有机化合物的定性定量分析。本文将给出用该仪器得到的芳香族化合物的紫外吸收谱,并分别比较了甲基苯甲醚和硝基甲苯的三种不同的同分异构体的吸收谱和质谱。

A fast scauming UV-Vis detector and it's applications in GC and GC/MS are described.The detector can be scanned fastly in ultraviolet range (190nm-365nm) and visible range (366nm-800nm).GC/UV can be given simultaneously a gas chromaforaph and an absorption spectrum,an GC/UV/MS,the detector may be obtained the structure of some compounds.Particularly,the detector has a high resolution performance,so that it is capable of ana- lyzing isomers.The operation temperatures of the flow cell is at environment to 35℃.Therefore,this defector can't be ap- peared any cold point in GC and GC/MS.The miuimal limit of the detector is 40pg/s for coumarin.The dynamic range of detection is 10~4.