北方典型城市及海洋大气中短链氯化石蜡的赋存特征及传输机制

As one type of emerging organic pollutants, short chain chlorinated paraffins (SCCPs) has the typical linear paraffined and halogenated structure characteristics compared with the traditional persistent organic pollutants (POPs). As a candidate of POPs, they existed at higher levels in environments of China. However, to date, there have been few reports on the environmental behaviors of SCCPs, especially the occurrence, gas/particle partitioning and transport mechanism in the atmosphere. The scientific target of the study is to reveal the atmospheric occurrence and transport mechanism of SCCPs and detailed objects are to (1) investigate the occurrence of SCCPs in the gas and different size particle phase of typical urban and island in north China; (2) estimate the emission source strength and local fractionation effect of different SCCP homologues in urban and island atmosphere; (3) reveal the mechanism and factors controlling the gas/particle pertitioning of SCCPs, and the air-sea exchange; and (4) assess the contribution of atmospheric input to the marine environments for SCCPs in the research region. The results obtained in the present study are expected to be helpful to understand the environmental fate of new POPs, especial for their distribution and long range transport in the marine atmosphere, and to assess the environmental risks of SCCPs. It is also useful to enrich the environmental geochemical circulation theory of new POPs.

短链氯化石蜡(SCCPs)是一类新兴的有机物污染物，相比传统的持久性有机污染物(POPs)，具有典型的直链卤代结构特征。作为POPs的候选者，其在我国环境的存量较大，但目前有关其环境行为的研究仍十分有限，其中有关SCCPs在大气中的赋存状态、气固分配以及传输机制等方面的研究更知之甚少。本项目以揭示SCCPs在大气中的赋存特征和传输机制为科学目标，研究其在我国北方地区城市和海岛大气气相及不同粒径颗粒相中的赋存状态，评估不同同族体的源强效应和局部分馏效应，揭示控制SCCPs气固分配行为关键因素与机理，阐明区域内SCCPs的海气交互作用，评估大气输入对区域海洋环境中SCCPs的贡献量。该研究对于揭示新型POPs在海洋大气环境中分布和迁移规律以及准确评价SCCPs的环境风险具有重要意义，而且有助于丰富新型POPs的环境地球化学循环理论。

短链氯化石蜡(SCCPs)是一类新兴的有机物污染物，相比传统的持久性有机污染物(POPs)，具有典型的直链卤代结构特征。作为POPs的候选者，其在我国环境的存量较大，但目前有关其环境行为的研究仍十分有限，其中有关SCCPs在大气中的赋存状态、气固分配以及传输机制等方面的研究更知之甚少。本项目以揭示SCCPs在大气中的赋存特征和传输机制为科学目标，研究其在我国北方地区城市和海岛大气气相及不同粒径颗粒相中的赋存状态，评估不同同族体的源强效应和局部分馏效应，揭示控制SCCPs气固分配行为关键因素与机理，阐明区域内SCCPs的海气交互作用，评估大气输入对区域海洋环境中SCCPs的贡献量。该研究对于揭示新型POPs在海洋大气环境中分布和迁移规律以及准确评价SCCPs的环境风险具有重要意义，而且有助于丰富新型POPs的环境地球化学循环理论。