【摘 要】
：
In the atmosphere,PAHs exist in the particle and the gas phase [1].The most PAHs with two or three aromatic rings,are mainly released in the gas phase,others are generally associated with the particle
【机 构】
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College of Food Sci.& Tech.,Leading Academic Descipline of Food Quality and Safety,No.J50704,Shangha
【出 处】
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第七届国际分离科学与技术会议(Proceedings of the 7th International Conferen
论文部分内容阅读
In the atmosphere,PAHs exist in the particle and the gas phase [1].The most PAHs with two or three aromatic rings,are mainly released in the gas phase,others are generally associated with the particle phase.The partition of PAHs in the gas and in the particle is related to many different variables like the vapor pressure,the ambient temperature the particulate size,and chemical composition of the particulate [2].The enrichment effects of organic micro pollutants from atmosphere by gas flowing-liquid phase and compared with XAD resin enrichment method were investigated.For optimization of the enrichment conditions,the experiment variables such as gas flow rate,temperature,and different solvents were investigated.The chemical composition of the PAHs was analyzed by GC-MS.The laboratory result shows the enrichment rate was 90±10% in a certain conditions (adsorbent of dichloromethane,cryohydrate bath and 3000 mL/min of carrier gas flow).To real sampling analysis,8 PAHs were determined,and well-pleasing results were obtained comparing with XAD technology.The new method of gas flowing-liquid phase is simpler and cheaper,especially the after treatment method is simpler than XAD and enrichment efficiency is similar with the XAD technology.
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