石油样品全二维气相色谱分析的分离特性

Separation Characteristics of Comprehensive Two-dimensional Gas Chromatography in Analyzing Petroleum Samples

汽油、柴油等石油产品是典型的复杂混合物体系。一维气相色谱 (1DGC)分离能力不够 ,重叠十分普遍 ,定性不准确 ,族之间也不能分离干净。研究了全二维气相色谱 (GC×GC)用于石油样品分析的分离特性。对一特定的石脑油进行研究 ,一次进样实现了烷、环烷和芳烃 (PNA)的族分离。与 1DGC比较 ,GC×GC的正交分离、族分离、瓦片效应等特性使其峰容量大、灵敏度高、定性更简单准确 ,适合复杂混合物体系的分析 ,也是一种检测痕量杂质的有效手段。

Separation characteristic of comprehensive two-dimensional gas chromatography (GC x GC) in analyzing petroleum samples was studied. A specific naphtha was analyzed and paraffins, naphthanes and aromatics were completely separated within one injection. The results were compared with those of one-dimensional gas chromatography indicating great advantages in separation and qualification of complex samples. GC x GC is also an effective method for the detection of trace impurities.