Studies Of Bioaccumulation And Evaluation On Pollutants In Marine Organisms From Coastal Site Along Guangdong Province

With the development of industry and agriculture, as well as the exploiture ofocean resources, products which contain heavy metals such as Cu, Zn, Pb and Cdwere widely used. Heavy metal pollution in piscatorial environment has arousedextensive attention, and it becomes the main matter as the ocean resources andenvironment research, and it has received more and more attention about the affectthat heavy metals to the seafood. Occurrence of organochlorines (abbr. OCP), such asdichlorodipgenyltrichloroethanes (abbr. DDT), hexachlorocylohexanes (abbr. HCH)and Polychlorinated biphenyls (abbr. PCB) which belong to persistent organicpollutants (abbr. POP) are a large group of organic pollutants, widely distributed inthe environments. Owing to their latent harm to the environment, increasing attentionof the public was focused on the movement and control discipline of them. Persistentorganic pollutants (POP) which is a kind of hazardous substance for its'nondegradable, carcinogenicity, accumulation and nonvolatility characteristics, hasexternal effect on the environment. Due to its extensive distribution and long duration,it is hazardous to human's health. In this study, it reports the heavy metals (Cd, Cu,Zn, Pb, Cr, Ni, Fe, Mn, As) and persistent organic pollutants (DDT, HCH, PCB)in marine organisms of Pearl River estuary and finless porpoise (Stenella attenuata)S8 and S14 from the coastal site in Beibu Gulf.In this study, all living samples were digested by microwave assisted acid, andall trace metals were determined by flame atomic absorption spectropbotometry(FAAS). In this thesis, it adopted metal pollution index to compare the othemessbetween different organisms, and introduced the "Evaluation standards of trace metalelements in aquatic organisms" and the "Limiting standard of noxious and nocuousmatters for aquatic products" to evaluate the pollution levels and edible security. Itadopted the Classical extraction method, following the extraction, condensation,depuration, and recondensation and then dilute to volume. The concentrations of POPin organisms were determinated by GC. It founded an integrated method andtechnology of POP analysis in organisms in this thesis.The results showed that there was an aggravating trend in metal pollution in theseareas, and Crustacean, bivalves, fishes and cephalopod all received heavy metalcontamination in different degree, even reached seriously polluted. Trace metals in many sea foods greatly exceeded the edible standard. For example, the highestconcentration of Cr and Pb in Collichthys lueidus were 23.93 and 48.05 times higherthan edible standard respectively, the Pb in Saurida elongate 52.66 times higher thanstandard, the Cu and Cd in Crassostrea rivularis were 740.27 and 89.59 times higher,respectively. A significant difference was found in enrichment ability betweendifferent organisms, and it was different between different tissues of the finlessporpoise (Stenella attenuata) either. The results also indicated that Pearl River estuaryand Beibu Gulf were not polluted by HCH and PCB. But the pollution of DDT wassignificantly because the content of DDT in some of the organisms from Pearl Riverestuary and the finless porpoise (Stenella attenuata) from Beibu Gulf were very high.All results above showed that the pollution of heavy metals and POP in PearlRiver estuary and Beibu Gulf has actually threatened the health of consumers.