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采用二维气相色谱法和火焰离子化检测器分析苯中痕量(mg/kg) 噻吩

Abstract: 采用Deans switch 方案的二维气色谱系统被用于苯中痕量(mg/kg) 噻吩的分析。该系统通过采用两种选择性不同的GC色谱柱：INNOWax 和PLOTQ，实现了噻吩从干扰样品混合物中的完全分离。由于高的分离度，该系统可以使用标准火焰离子化检测器代替价格昂贵、复杂的硫选择性检测器。该系统所给出的精确定性和定量分析结果与使用硫选择性检测器所得到的结果相一致。这种多功能系统在测定噻吩含量的同时，也可以实现美国试验与材料协会分析苯纯度的标准方法。 A 2-D gas chromatography system using a simplified Deans switch design is used for the analysis of trace (mg/kg) of thiophene in benzene. This system uses two GC columns of different selectivity, Innowax and PLOT Q, to completely separate the thiophene from the interfering sample matrix. Because of this high resolution, standard flame ionization detectors can be used in place of more expensive and complex sulfur selective detectors. The system shows precise qualitative and quantitative analyses and to give results that are in agreement with those using sulfur selective detectors. This versatile system can also perform a standard ASTM benzene purity analysis at the same time the thiophene measurement is made.

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