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影响有机污染物在空气颗粒物与空气之间分配行为的分子间作用力

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摘要 有机污染物在空气颗粒物与空气之间的分配系数(Kp)对于描述其在大气中的行为具有重要意义,是进行生态风险评价的基础数据.基于18种正构烷烃、21种多氯联苯、16种二英类化合物和13种多环芳烃的Kp值,采用理论分子结构描述符和偏最小二乘(PLS)回归,建立了Kp的多参数线性自由能关系(LFER)模型.该模型具有较好的稳健性和预测能力,可用于结构类似化合物Kp值的预测,并有利于对分配机理的解释.结果表明,色散力是影响有机化合物在空气和颗粒物相间分配的主要因素,电荷转移作用和分子位阻大小对Kp值也有一定影响.同时,对不同种类化合物分别建模,结果表明,影响几类化合物分配的机理相似,偶极-偶极、偶极-诱导偶极作用对正构烷烃、PCBs和PCDD/Fs的KP值有微弱的贡献.
出处 《科学通报》 EI CAS CSCD 北大核心 2006年第20期2369-2372,共4页 Chinese Science Bulletin
基金 国家重点基础研究发展计划(批准号:2004CB418504) 工业生态与环境工程教育部重点实验室资助项目.
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