一、前言随着高灵敏度鉴定器的使用,气相色谱已进入痕量分析范围,如氦离子化鉴定器对永久气体和无机气体具有极高的灵敏度。但是,它要求气路系统必须保持十分良好的气密性,而气密性的关键是进样系统中的六通阀。这一重要部件目前我国还没有生产。为适应科研工作的需要,我们研究了国内外厂家目前生产的六 I. Introduction With the use of high-sensitivity detectors, gas chromatography has entered the range of trace analysis, such as helium ionization detector for permanent gases and inorganic gases with high sensitivity. However, it requires that the air circuit system must maintain a very good air tightness, and the key to air tightness is the six-way valve in the injection system. This important component is currently not produced in our country. In order to meet the needs of scientific research, we study the domestic and foreign manufacturers currently producing six