SPME法分析玉米芯物理吸附恶臭气体特征研究

Solid Phase Microextraction Sampling for Evaluation of Absorbing Characteristic of Corn-Cob

摘要: 本研究考察以农副产品玉米芯为填料净化恶臭气体的效果，并以SPME-GC(固相微萃取-气相)联用作为监测方法。实验对固相微萃取的萃取头类型、萃取时间及条件进行了优化，对气相色谱的色谱条件进行了筛选，针对填料玉米芯的含水率、进气流量、填料高度等因素对净化效果的影响进行了重点探索，最后考察了最优条件下玉米芯对恶臭气体的物理净化效果。结果表明：采用75 μm CAR/PDMS萃取头吸附恶臭气体5 min，可以实现恶臭气体的有效检测；气相色谱的升温程序能够有效分离三种硫醇物质，FPD检测器能够实现有效检测；玉米芯吸附恶臭气体的最优条件为含水率70%、自然堆积密度0.12 g∙cm–3、填料高度65 cm、进气流速0.1 m3∙h–1；最优条件下，吸附塔动态吸附恶臭气体47 h，对恶臭气体净化率维持在85%~95%，效果良好。

Abstract: This study explored the decontamination effect of corn-cob on odors by using SPME-GC (solid phase micro-extraction, gas chromatography). The type of extraction fiber, the time and condition of the extraction on SPME were optimized, and the chromatographic condition on GC was screened. The study focused on investigating the optimum condition of the decontamination effect of corn-cob including the moisture content, the inlet air flow rate and the filling height. Results: The study indicated that using 75 μm CAR/PDMS extraction fiber to absorb odors for 5 minutes could effectively test the odors; three mercaptan could be separated by temperature-programming and effectively determine by FPD; the optimum condition of absorption was moisture content 70%, natural packing density 0.12 g∙cm–3, filling height 65 cm and inlet air flow rate 0.1 m3∙h–1. Under the optimum condition, the decontaminating efficiency of corn-cob on odors maintained at 85%~95% in 47 h.