Pollution Characteristics and Assessment on the Pollution Historical Evolution of Hg, As in Sediments of Functional Zones in Coastal Waters of Northern, Jiangsu

LI Yu; GUAN Minglei; YU Yang; LIU Fucheng; ZHANG Rui; LI Mingdong

Abstract：In 2014,three sediment core samples were collected from different functional zones (drainage area:Linhong river mouth,coastal recreational area:Liandao,coastal industrial zone:Guanhe) in Haizhou Bay of northern Jiangsu.Concentrations and vertical distribution characteristics of Hg,As in sediment cores were examined.Results showed that vertical distributions of Hg,As were different in sediment cores from functional zones and in different layers in sediments.Hg had highest content from 1987 to 2005,and As was found in recently years,which are related to economic development of Lianyungang.From 1980s to 2005,the modern industry of Lianyungang had a rapid development,and then an adjustment was made to industrial structure in order to protect environment.As is mainly from agriculture and fishery,which belongs to nonpoint source.The trend of As pollution was increasing year by year,which may be correlated to no way to effective governance.According to enrichment factors (EF) of Hg,As,the accumulation states and contamination were different in sediment cores from different functional zones.Nearly 40,Hg was not enriched or minor enriched in sediment core in drainage area,and no enrichment in coastal recreational area,which showed no contamination of Hg in sediments.Severe enrichment and heavy contamination of Hg were found in sediments from coastal industrial zone.As was heavy enriched with an increasing tendency in sediment core in drainage area and showed heavy contamination.Minor enrichment of As was found in sediments from coastal recreational area and coastal industrial zone.The total tendency of As' EF was increasing from bottom to top layer in sediment core in coastal industrial zone and showed heavy polluted in some years.