Elucidation of transboundary pollution of micro-pollutants from the mainland China to the sea around Japan via ocean currents

采用新开发的两种筛选方法和两种精确分析方法对1270种物质进行了分析。检测到的物质数量为167种，检测浓度范围为0.79 ~ 7.26 ug/L。利用河流流速和检测到的浓度，计算出其排入东海的量至少为每年4460吨。在似乎受河水影响最严重的地方，河水占据了海水的1/11。从这个稀释比来看，来自河流的微污染物似乎不会对海洋中的水生生物产生不利影响。

To elucidate transboundary pollution of micro-pollutants from the mainland China to the sea around Japan via ocean current, we surveyed river water in the mouth of the Yangtze River twice in the fiscal year of 2012. Newly developed two screening methods and two precise analytical methods were employed for analysis of 1270 substances.The number of substances detected was 167 and detected concentrations ranged from 0.79 to 7.26 ug/L. Using the river flow rate and the detected concentrations, the volume of them discharged to the East China Sea was calculated at least 4460 tons a year. River water occupies 1/11 of seawater at the point that seems to be most affected with river water from the river. From this dilution ratio, micro-pollutants from the river seemed not to give adverse effects on aquatic organisms in the sea.