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

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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.