Preliminary analysis on the state of organic pollution and eutrophication in Bohai Bay

Based on the data of 2008,the nutrients and eutrophication characteristics in Bohai Bay were discussed in detail. Variation features of inorganic nitrogen and phosphate in Bohai Bay were analyzed,so were the parameters such as pH,salinity,DO,COD and chlorophyll a. Combined with the economy developing status of Bohai Bay,the main parameters of water quality,the status of nourishment and organic pollution were assessed. The results indicate that,from the nutrition structure,the inorganic nitrogen is the limit factor for growth of phytoplankton,and compared with Redfield ration of chemical measure for the nutrient salts,it is accorded with the limit condition of phosphate nutrient. According to the amended evaluation mode of eutrophication and the organic pollution index,the water of Bohai Bay was polluted lightly and its quality was eutrophication in 2008.