TAILIEUCHUNG - WATER POLLUTION IN THE RIVER MOUTHS AROUND BOHAI BAY

Travel from the eastern suburbs presents a variety of different options including travel by bus, car, bicycle and walking/running. Many different route choices exist including segments of motorway, busy arterials and quieter streets. There is also a commuter train that runs directly into the city centre. The journey is approximately 12 km in distance, depending on the specific route taken. Each of the participants recruited for the study was a regular commuter on their chosen mode. Each was asked to time their journeys in such a way as to arrive at work for a 9:00AM start (or as close. | Technical Notes WATER POLLUTION IN THE RIVER MOUTHS AROUND BOHAI BAY Cheng LIU1 Zhao-Yin WANG1 2 and Yun HE3 ABSTRACT Twelve water samples were collected and analyzed. The samples were taken from the river mouths around Bohai Bay including the Jiyun New Yongding Haihe Dagu Duliujian Qingjinghuang Qikou Dakou and Yellow Rivers and tested for concentrations of heavy metals arsenic total nitrogen TN and total phosphorus TP . The results show that the river mouths are polluted and the water quality exceeds Class V of the Environmental Quality Standard for Surface Water EQSSW . The main pollutants are Hg nitrogen N and phosphorus P . The concentrations of the other pollutants are within Class II of the Standard. The Hg content in the Haihe River mouth is now 10 times higher than it was 20 years ago indicating that the accelerating water pollution has reached an alarming level. The high concentrations of N and P cause eutrophication of the waters. Analysis indicates that the terrestrial pollutants and nutrients are the main cause of frequently occurring red tides in the Bohai Sea. Key Words River mouth Water quality Pollution Red tide Bohai Bay 1 INTRODUCTION Bohai Bay is in the northwest part of the Bohai Sea. Many large cities and industrial hubs are located around the bay including Beijing Tianjin Tangshan Cangzhou Huanghua Binzhou and Dongying. The area has experienced quick economic development and urbanization and has become one of China s political economic and cultural centers. The rapid development and corresponding human activities have had severe influences on the water environment. Recent investigations show that a large part of the coastal waters of Bohai Bay have been polluted with concentrations of pollutants exceeding Class III of the Sea Water Quality Standard GB 3097-1997 of China Zhao et al. 2000 . The pollution has deteriorated the ecology and reduced biodiversity of the waters. From 1983 to 1993 the number of fish species decreased from 85 to 74 in .

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