气体样品的动态预浓缩方法

 :通过迎头色谱常温吸附富集与反吹 峰切割 温度梯度热脱附技术的结合 ,建立了一套气体样品动态预浓缩装置 ,实现了室温条件下对沸点≥ - 10 3℃的气体样品的快速富集。该方法同时利用反吹切割带来的瞬间非稳定态和加热脱附时形成的温度梯度 ,实现了以较小的进样量得到较大的浓缩比的目的。用标准气体样品测试的结果是 :当进样量为 10mL时 ,浓缩倍数达到 10 0倍。

Dynamic Pre-concentration Method of Gas Sample

By utilizing the combination of frontal chromatography at ambient temperature, back-flushing and temperature gradient thermal desorption, a prototype of a dynamic pre-concentration system has been designed and evaluated. It realized the enrichment for gas samples of boiling point higher than - 103 degrees C without cryogenic facilities. To reduce the sample volume and enhance enrichment factor, the technique of momentarily non-steady state produced at the beginning of back-flushing, and the negative temperature gradient generated during thermal desorption were utilized, resulting a very sharp desorption band. Standard samples were tested to demonstrate the applicability of the method. At 10 mL sample volume, the enrichment factor was 100.