Atmospheric Short-Chain Chlorinated Paraffins in China, Japan, and South Korea

摘要

This study presents the first investigation of concentrations and congener group patterns of atmospheric short-chain chlorinated paraffins (SCCPs) throughout East Asia. Based on an absorption rate calibration experiment, a spatial survey of SCCPs was performed using passive air samplers in China, Japan, and South Korea during two separate periods in 2008. The atmospheric concentrations of SCCPs in China were clearly greater than those in Japan and South Korea, both of which exceed the levels determined for other regions of the world. C_(10) components were the most abundant type of SCCPs in China, whereas C_(11) components were dominant in Japan and South Korea. With respect to the total chlorine content, Cl_6 and Cl_5 were the predominant compounds in China and Japan; however, Cl_6 and Cl_7 were predominant in South Korea. A similar pattern was also found for remote sites within China, Japan, and South Korea, respectively. Together with the back-trajectories calculated for the remote sites, the results indicate that the SCCPs in the air of East Asia were mainly influenced by local sources due to their relatively low long-range atmospheric transport potential compared to other POPs.