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将传统的气相色谱直形衬管改为胃袋式的弯曲形衬管,发展了一种新型的气相色谱进样器——胃袋式大体积进样器。大体积(200μL左右)的含被测物的溶液注入进样口后,溶液以液体形态存在于胃形衬管内,溶剂在大量载气的吹扫下被蒸发并通过分流阀溢出,而被分析物被浓缩并保留在衬管中,当溶剂吹出后,进样口改为不分流模式,快速升温使被分析物进入色谱柱。对比实验表明,胃袋式大体积进样器与常规进样器相比,峰形与常规进样器无明显差别,不存在峰形拓宽的现象,当被分析物的总进样量相同时,响应值基本相同。不同体积,相同浓度的加标样品的响应值成线性关系,相关系数在0.99以上,表明大体积进样器在不同进样量时的传输效率基本一致。
The traditional gas chromatographic liner liner to gastric bag-shaped curved liner, the development of a new gas sample injector - stomach bag large-volume sampler. After a large volume (about 200 μL) of the analyte-containing solution is injected into the injection port, the solution is present in liquid form in the gastric liner and the solvent is evaporated by a large amount of carrier gas and overflows through the diverter valve to be analyzed The material is concentrated and retained in the liner. When the solvent is blown out, the inlet is switched to splitless mode, where it rapidly warms the analyte into the column. Contrast experiments show that the gastric bag-type large-volume injector compared with the conventional injector, the peak shape and conventional injector no significant difference, there is no broadening peak shape, when the total amount of analyte injection the same amount, The response is basically the same. The response values of spiked samples of different volumes and concentrations were in a linear relationship with the correlation coefficient of above 0.99, indicating that the transmission efficiency of the large-volume sample injector was basically the same at different injection volumes.