我们对快餐盒中二氟二氯甲烷(F—12)残留量进行了测定,我们于3个月内分别从工厂车间采回3批样品,每批样品均分成2组,1组敞开存放,另1组密封存放即按工厂办法保存。观察7周,每周测定1次,用顶空气相色谱法进行测定。结果:两种存放条件均有自然降低的规律,20000ppm以上,经7周后下降为2000ppm,几乎降低 We measured the residual amount of difluorodichloromethane (F-12) in fast food containers. We collected three batches of samples from the factory workshop within three months. Each batch of samples was divided into two groups. One group was stored open, Another group of sealed storage that is factory-based preservation. Observed for 7 weeks, once a week and determined by headspace gas chromatography. Results: The two storage conditions are naturally reduced law, more than 20000ppm, after 7 weeks dropped to 2000ppm, almost reduced