长江口海域壬基酚风险评价.doc

Spatial Distribution and Ecological Risk Assessment of Nonylphenol in Sediments from the Yangtze Estuary and Its Adjacent area Wang Xiao-yan1, 2 Zhang Gui-cheng1, 2 Liang Sheng-kang1, 2 Li Yan-bin1, 2 Liu Xia1, 2 Wang Xiu-lin1, 2 1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Qingdao 266100, China 2. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China Abstract: Distributions of nonylphenol (NP) were surveyed in 26 surface sediments and one sediment core collected from the Yangtze estuary and its adjacent area during May-June in 2010. In the surface sediments, NP concentrations increased firstly and then decreased from inshore to offshore with a range of 137.5 - 559.0 ng/g d.w. (dry weight). The high values of NP were found in the coastal mud areas. The spatial distribution of NP was influenced by the Yangtze River runoff and other water currents controlling the transport of sediments. In the core sample, NP concentrations decreased with the increasing depth, indicating a more serious NP pollution during the period of 2000-2010. Overall, the NP contamination level in this area was medium, compared with those of other estuaries and bays. However, high Risk quotients values of NP in all the stations ranging from 3.5 to 14.3 suggested a significant risk for the sediment biota. Key Words: Nonylphenol; Yangtze Estuary and Its Adjacent Area; Distribution; Sediment; Ecological Risk Assessment 1. Introduction Nonylphenol (NP) is a synthesis material and degradation product of nonylphenol polyethoxylates (NPnEO) which are nonionic surfactants widely used in a variety of industrial products such as detergents, pesticides, plastic additives, textile auxiliaries ,papermaking and oil chemicals. Approximately 500,000 tons of NPnEO are produced globally in each year (Renner, 1997), of which 10% are from China (Wang et al., 2010). NP is stable and can remain in the environment for years. It is bi