【摘要】 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。更多还原

【Abstract】 Determination of isokitazine in air by gas chromatography coupling of with thermal desorption is described. The method is. sensitive, rapid, simple and has dispensed with use of organic solvent.Air samples are drawn at a rate of 0.2-0.31 L/min and passed through a glass tube containing Tenax GC generally 10 minutes is enough for sampling, then the Tenax GC tube is put in a thermal apparatus for desorption of isokitazine under a certain temperature. Vaporized isokitazine was condensed at 0℃ for a few minutes. Then the temperature is raised in a flash to about 300℃ to cause immediate vaporization of isokitazine. Isokitazine was carried by nitrogen gas to gas chromatography and quantify by a flamepho to detector.更多还原