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本文介绍了用直接热解吸气相色谱法测定空气中异稻瘟净的方法。本法的特点是灵敏、快速、简便和不使用溶剂。采样是用泵或注射器将含有待测物质的空气以0.2～0.3L/min的速度通过Tenax GC吸附管,一般只需10min即可。采样后带回实验室。将Tenax GC采样管直接放入热解吸器中,在一定温度下进行解吸,然后冷凝浓缩在热解吸器的致冷器中。数分钟后,以闪蒸25s(温度约300℃)使异稻瘟净瞬间汽化释放,并由载气(氮气)输送到层析柱中进行分析,以磷火焰光度检测器(FPD)进行测定。
This article describes the direct thermal desorption gas chromatography method for the determination of dilute rice in air. This method is characterized by sensitivity, speed, simplicity, and use of solvents. Sampling uses a pump or syringe to pass the air containing the test substance through the Tenax GC adsorption tube at a rate of 0.2-0.3 L/min, typically only 10 minutes. Take samples back to the laboratory. The Tenax GC sampling tube was placed directly into the thermal desorber, desorption was performed at a certain temperature, and then condensed in the refrigerator of the thermal desorber. After a few minutes, different rice blasts were vaporized and released by flash evaporation for 25 s (at a temperature of about 300°C) and transported by a carrier gas (nitrogen) to the column for analysis by a phosphorus flame photometric detector (FPD). .