抄録
Nearly 950 semi-volatile organic compounds (SVOCs) have been investigated in river water from the mouth of the Yangtze River to assess their pollution status and to estimate the amount of chemicals discharged to the East China Sea.The survey was carried out by a combination of screening analysis (GC-MS in Scan mode and an automated identification and quantification system with a database) and targeted analysis (GC-MS in Selected Ion Monitoring mode and GC-MS/MS in Selected Reaction Monitoring mode). The number of SVOCs detected was 143 out of 947 chemicals in the database; the total concentrations of the chemicals detected ranged from 0.78-4.34 µg/L and 0.26-2.48 µg/L in the rainy season and the dry season, respectively. An estimated 3600-10000 tons of these chemicals are discharged to the East China Sea annually.From pollution profiles obtained in this study, the main pollution sources are industrial activities and domestic activities.Since ratios of the detected concentrations (PEC: Predicted environmental concentration) to their predicted no-effect concentrations (PNEC) of 6 compounds such as fenobucarb, 4-chloroaniline, and aniline were larger than one, indicating that these chemicals may cause adverse effects on aquatic organisms living in the Yangtze River. The concentration of chemicals at the point in the East China Sea that is the most affected by water from the Yangtze River is 1/11 of concentrations in the river water. However, considering that the PEC/PNEC of some chemicals are over one and amounts discharged from the river will likely increase with a rapid growth of Chinese economy, continuous surveying is needed to elucidate the transboundary pollution of chemicals transported from China to Japan by ocean currents.
