研究了大连市城区秋季(10月和11月)大气中SCCPs在气相和颗粒相中的浓度及分布特征,计算了SCCPs的气/粒相分配系数,研究了其与环境温度、SCCPs的过冷液体蒸汽压及正辛醇-空气分配系数的相关性.结果表明,秋季大连大气中SCCPs主要以气态形式存在.气相中SCCPs浓度10月明显高于11月,但颗粒相中SCCPs浓度11月与10月变化不明显.大气中SCCPs的气/粒相分配系数与其过冷液体蒸汽压和正辛醇-空气分配系数均有较好的线性相关性,对秋季大气中SCCPs的气/粒相分配起主导作用的是颗粒物中的有机质吸收机理,环境温度对其气/粒相分配行为有一定的影响.%The concentration and distribution of SCCPs in gas phase and particle phases in the urban air of Dalian in autumn (October and November)were studied. The gas-particle partitioning coefficients of SCCPs in the air were calculated,the correlation of which with environment temperature,their sub-cooled liquid va-por pressure and octanol-air distribution coefficient were studied. Results indicate that the SCCPs are mainly in gas phase in the urban air of Dalian in autumn. The concentration of the SCCPs in the gas phase in October is higher than that in November. However,the difference of the concentration of the SCCPs in the particulate phase is not obvious between November and October. There are good correlations between the gas-particle par-titioning coefficients of SCCPs in the air with their sub-cooled liquid vapor pressure and octanol-air distribution coefficient,and the absorption mechanism by organic compounds in particulates contributed more to the parti-tioning process. Ambient temperature has certain influence on its gas-particle partitioning behavior.
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