二噁英等POPs现场监测的部分问题探讨

Study on Problems of Field Monitoring of Dioxin and Other POPs

采用真空密封包装保存持久性有机污染物(POPs)采样吸附材料,优化试验条件后,通过生活垃圾焚烧发电厂的现场监测验证方法的可行性。结果表明,真空密封保存8 d内多环芳烃的空白值与15 d内二噁英的空白值均符合标准要求;在烟气温度135℃~225℃条件下采集固定污染源烟气时,宜将冷却水循环装置冷却水温度控制在25℃以内,该条件下,不同容量的冷却水循环装置及不同水温对气相吸附柱温度影响较小,对二噁英测定结果无明显影响。

In this paper,a method was established for collecting persistent organic pollutants(POPs)with adsorption materials and storing them in vacuum sealed package.After optimizing the test conditions,the feasibility of the method was verified by on-site monitoring of MSW incineration power plant.The results showed that the blank values of PAHs and dioxins stored in vacuum seal for 8 days and 15 days met the standard requirements,respectively.When flue gas from stationary sources was collected at the temperature of 135℃~225℃,the cooling water in cooling water circulating device should be controlled within 25℃.Under this condition,the influences of different capacity of cooling water circulating device and different water temperature had little effect on the temperature of gas phase adsorption column,and had no obvious effect on the determination results of dioxin.