Characteristics and Influencing Factors of Heavy Metals in Tangshan Coastal Environment

• 1、School of Mining engineering, North China University of Science and Technology, Tangshan 063210
• 2、School of Mines, Liaoning Technical University, Fuxin 123000

Abstract：Tangshan is an important industrial base in the north of China. With the rapid industrialization process in recent years, Tangshan coastal zone has become an important place to undertake key enterprises such as steel and chemical industry in Beijing, Tianjin and Tangshan. On the basis of detailed field survey, abundant surface sediment samples were collected from river estuary, Caofeidian wetland, Nanpu, leting and other industrial areas, ports such as Jingtang Port, Xiangyun Bay Tourist Area and artificial island. The samples were analyzed by XRF, AAS and ICP-MS. The study shows that due to the construction of large-scale marine engineering such as artificial island and port breakwater, the original sedimentary conditions have been changed, and the local hydrodynamic conditions have changed, resulting in the imbalance of scouring and silting conditions. The erosion of the original silted coast has been intensified, and the sediment particle size in the argillaceous deposition area has increased, resulting in the accumulation of silt and sand. This feature is most obvious in Caofeidian port, Jingtang Port and daowanggang. On the micro level, the process of industrialization leads to the migration or accumulation of trace elements, and the pollution of heavy metals tends to aggravate, which is higher in Luanhe estuary, douhekou, Caofeidian port, Jingtang Port and other observation points, while it is lower in wetlands and sea reclamation areas. It is suggested that the rapid industrialization process may lead to the enrichment of some elements in the new sedimentary environment, or the content of some elements may be reduced due to dilution in a specific environment, which is of great randomness and uncertainty.

Keywords： Tangshan coastal zone Heavy metal Content characteristics Response