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环境化学  2015 

大连大气中多氯联苯的气粒分配行为

Keywords: 大气,多氯联苯,气粒分配系数,正辛醇-空气分配系数,气固分配,大连

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Abstract:

主要研究了大连大气中多氯联苯(PCBs)在采暖期与非采暖期的气粒分配行为.利用大流量主动采样仪对大连市大气样品进行采样,测定了大连大气中PCBs在气相与颗粒相中的组成、浓度,计算了PCBs的气粒分配系数(Kp),研究了Kp与环境温度、PCBs的过冷液体蒸汽压及其正辛醇-空气分配系数的相关性.并采用实测数据,研究了两种气粒分配模型(Junge-Pankow模型、Harner-Bidleman模型)对大连市大气中PCBs气粒分配行为的预测效果.结果表明,在采暖期,除PCB#28、52以外,其他PCBs在颗粒相中的浓度均高于在气相中的浓度;在非采暖期,PCBs在气相中的浓度高于颗粒相中的浓度;PCBs的气粒分配系数与环境温度、其过冷液体蒸汽压和正辛醇-空气分配系数均有良好的线性相关性;Junge-Pankow吸附模型和Harner-Bidleman吸收模型都可用于大致描述PCBs的气/粒分配行为.

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