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适用于Agilent 7890A和6890系列气相色谱仪的高压进样设备

Abstract: 高挥发性液化烃类的进样和精确分析是气相色谱技术中一个倍受关注的问题。针对该问题，一种适用于宽沸程、轻质石油样品的独特进样设备目前已被成功开发，该设备由液体旋转阀和针状接口组成。本文对该解决方案进行了描述。一套用于7890A 气相色谱仪的该种进样系统包括一个4 通液体阀、一根经去活处理的可更换针头和一路辅助气体。针头与液体阀的一个通道直接相连。这种结构紧凑的进样设备直接安装在分流/不分流进样口的上部。该系统如常规的液体自动进样器一样自动操作；但在进样过程中针头并不从进样口拔出。该设备已成功处理了多种高压液体，如液化天然气（校正标准物）、乙烯、丙烯和丁二烯。定量分析结果表明，该进样系统具有良好的重复性， 相对标准偏差通常在1% 以内。 Gas chromatography, sampling and representative analysis of highly volatile liquefied hydrocarbons with high precision and accuracy can be challenging. In the solution described here, a unique sample injection device based on a needle interface and liquid rotary valve has been designed for sampling light petroleum matrices with broad boiling point distributions. The 7890A GC-based system consists of a 4-port liquid valve, a deactivated removable needle, and auxiliary flow. The needle is directly installed on one port of the valve. This compact device is installed directly over the top of a split/splitless inlet. The unit is operated automatically just like a typical liquid autosampler; however, the needle is not withdrawn. Various pressurized liquid samples have been run on this device, such as liquefied natural gas (calibration standard), ethylene, propylene, and butadiene. Excellent repeatability is obtained with RSDs typically below 1% in quantitative analyses.

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