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气相色谱法是利用被分析物质在色谱中气相和固定相分配系数的差别,物质在两相作反复多次的分配,从而使各组分分离,而这一过程是在内装固定相的色谱柱中进行,因此选择好的固定相是色谱分离的关键。一般固定相是由载体加固定液而组成,这样由于载体是固定液的支持物,就成为色谱固定相的一个重要部分,大多为多孔性固体颗粒。一种理想而适用的载体应满足下列要求:表面积大,孔径分布较均匀;表面无(或很弱)催化或吸附性能;与固定液或被分析的物质不起反应;热稳定性好;有较好的机械强度.
Gas chromatography is the use of the analyte in the gas chromatographic phase and the stationary phase partition coefficient difference, the material in the two phases as many times the distribution, so that the separation of components, and this process is in the stationary phase of the column So the choice of good stationary phase is the key to chromatographic separation. Generally, the stationary phase is composed of a carrier and a fixing liquid. As a result, the carrier is a supporter of the fixing liquid and becomes an important part of the stationary phase of the chromatography, mostly porous solid particles. An ideal and suitable carrier should meet the following requirements: large surface area, uniform pore size distribution; no (or very weak) catalysis or adsorption on the surface; no reaction with the fixative or analyte; good thermal stability; Better mechanical strength.