Research On Distribution And Variation Of Heavy Metal Pollution In Guangxi Inshore

With the rapid development of the economy, marine heavy metal pollution was on the increase, it seriously affected the health of aquatic organisms and humans, and caused many problems in ecological enviroment. Marine heavy metal pollution including submarine sediments pollution and seawater pollution. To research the heavy metal pollution,10 monitoring stations was set up in Guangxi inshore, monitored the heavy metal contents of submarine sediments and seawater in wet season, dry season and normal season, respectively. Then, analysised and evaluated the heavy metal pollution of submarine sediments and seawater according to Marine Sediment Quality and Sea Water Quality Standard.The results showed that the concentration of heavy metal in Guangxi inshore was small and the pollution was light. The concentrations of Cu, Zn, Pb, Cd, Cr, Hg and As in Guangxi inshore submarine sediments all could meet the priority standard of Marine Sediment Quality. From 2007 to 2009, most of the heavy metal concentrations in sediments had a downward trend, the sediment quality was further improved. In 2007 and 2009, the seawater quality levels of dry season, wet season and normal season were all best. And from 2007 to 2009, the seawater quality was further improved becaused of the heavy metal pollution reduction in Guangxi inshore, The ratio of seawater which could meet the priority standard of Sea Water Quality Standard was above 90%. The heavy metal concentrations of each monitoring station had great relations with local marine functinall areas and the surrouding marine environment. The supervision of the fishing areas, dumping dredged mud areas, seafood areas and offshore areas should be strengthen particularly.