顶空气相色谱法同时测定空气中甲醇和乙醇实验研究

摘要

The method of determining methanol and ethanol in air by headspace gas chromatograph is simple and fast .This paper adopts distilled water to absorb methanol and ethylene in the air with DB -624 capillary column in headspace and detected by flame ionization detector.The actual operation shows that the minimum detection limits of methanol and ethanol are both 0.11 mg/m3 , lower than national standards.%顶空气相色谱测定空气中甲醇和乙醇含量，方法简单、快速，无需使用有机试剂。本方法以蒸馏水吸收空气中甲醇和乙醇，顶空进样经DB-624毛细管柱分离，氢火焰离子化检测器检测，时间定性，峰面积定量，其甲醇加标回收率为96.7％～104.6％，乙醇加标回收率为94.7％～103.8％，当在采样体积为40 L的条件下，甲醇和乙醇最低检出质量浓度均为0.11 mg/m3。实际操作证明，该法能满足工业废气和空气中的甲醇和乙醇的监测。