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LIU Liang;WANG Ju-Ying;HU Ying-Ying;HUO Cheng;WANG Li-Jun;YANG Zheng-Xian;National Marine Environmental Monitoring Center;  
Using marine environmental monitoring data, contamination of petroleum hydrocarbon in sea water, sediment, and shellfish in Bohai Sea coastal sea areas was assessed and their sources analyzed with Mann-Kendall statistic method. Results show significant increases in petroleum hydrocarbon content in sediment and shellfish, which had been exceeded the national benchmark several years ago. However, in the sea water, the content was unstable and instantaneous as petroleum hydrocarbon tends to accumulate in sediments or organisms. Therefore, sediment and the organism recorded the variation status of the contamination in a marine environment. Man-Kendall analysis results reveal that the median concentration of petroleum hydrocarbon in sediments of the Liaodong Bay, Bohai Bay, Huanghe(Yellow) River estuary, Laizhou Bay, and Dalian coastal marine area presented a rising trend that sometimes significant, but not in sea water. Land-shed pollutants, particularly those from rivers were the most direct and responsible source of the pollution in these maritime environments. Therefore, good management shall be coordinated for effective controlling the pollution sources. In addition, discharges of petroleum hydrocarbon from fishing boats and facilities have been rising alarmingly in recent years termed as line-source pollution and are difficult to deal with, which calls for strong regulations by local governments.
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