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采用Rt-silica Bond Plot毛细管色谱柱(硅胶键合极性基团固定相)的GC-FPD色谱系统,检测了环境中的含硫恶臭气体甲硫醇、甲硫醚、乙硫醇、二硫化碳和二甲二硫的混合气体。实验研究了气相色谱柱进样口压力和升温方式对分离效果的影响,在最佳分离条件下对5种气体的混合样进行了重复性测试,并利用自制的Tenax管式富集器分析5种气体的检出限。方法的最佳进样口压力为48.26 k Pa和最佳升温方式为初始温度160℃,以30℃/min升至220℃,可以实现混合气体的完全分离,分离时间3.850 min,组分间最小分离度2.525,最佳条件下具有很好的重复性,保留时间和组分分离度的相对标准偏差均小于1%,峰面积相对标准偏差最大为5.0%,5种气体的检出限依次为45,37,21,30和22μg/m3。
The sulfur-containing malodorous gases methyl mercaptan, methyl sulfide, ethane thiol, carbon disulfide and carbon disulfide were detected by GC-FPD chromatography system using Rt-silica Bond Plot capillary column (silica bonded polar group stationary phase) Dimethyl disulfide gas mixture. The effects of pressure and heating mode on the separation efficiency of gas column were experimentally studied. Repeatability tests were performed on the mixed gas samples of five gases under the optimal separation conditions. The gas chromatographic analysis was performed using a homemade Tenax tube enrichment unit Detection limit of gas species. The optimum inlet pressure of the method is 48.26 kPa and the optimum temperature is 160 ℃. The optimum temperature is 160 ℃. When the temperature rises to 220 ℃ at 30 ℃ / min, the gas mixture can be completely separated, the separation time is 3.850 min, The resolution was 2.525, the best reproducibility was obtained, the relative standard deviations (RSDs) of retention time and resolution were less than 1% and the relative standard deviations (RSDs) were 5.0%, and the detection limits of five gases were 45, 37, 21, 30 and 22 μg / m3.