Study On The Chemical Forms Of Some Metallic Elements In The Sediments Of Jiaozhou Bay And Qingdao Inshore Areas

Study on the sediment in the bay and inshore area is more difficult than the deepsea areas. Metallic elements in the Bay and Inshore area, which are originated fromboth terrestrial source and marine source, have more complex chemical speciationdistribution, migration and transformation law, marine hydrology and sedimentdynamic environment. The analysis of the chemical forms of metallic elements andmajor component in the sediments of Jiaozhou Bay and Qingdao inshore areas canshow environmental change, human influence and metal pollution, in order to studythe source, transport and fate of metallic elements in this area. In this paper, thesolid-liquid ratio is discussed in the sequential extraction method and determine thebest one is5mg/mL. Surface sediments of Qingdao inshore collected in November2008, surface sediments in Jiaozhou Bay and sediment core in Dagu estuary inWestern Jiaozhou Bay collected in November2010, are sequential extracted. Themajor component and chemical forms of metals in these sediments are analyzed todiscuss the factors affecting metallic species distribution and the law of source andmigration. The heavy metal pollution is assessed in study area. In addition, theanalysis of the metallic species distribution of the core can reveal the trend of themetallic element with the time scale to explore the impact of human activities onenvironment in research area. The conclusions are summarized as follows:1. Ba, Sr, Mg, Ca and Mn are mainly in EXC.The main form of Pb is CARB.ERO is the main from of Fe. Cu, Zn, Al, Co in the sediments of Qingdao inshore aremainly in ERO. V, Ni, Cr are maily in OSM. The non-residual content and the totalcontent distribution of Cu, Zn, Pb, Ba, Ni, Cr and Fe of the Jiaozhou Bay are higherthan Qingdao inshore, especially licun estuary is highest. Ca, Sr, Mg, Co, on thecontrary, the9th station is highest. The non-residual content distribution of Al, V ishigher in Jiaozhou Bay, while the trend of the total content is the opposite. The PLIreveals all metal exists pollution; only Pb in some stations appears pollution and aresecondary polluted more easily than other metallic elements; the PLI in7th,9th andL1, L2, M1station is higher than others. the possibility of suffering contaminationand secondary contamination risk is relatively larger in Eastern Jiaozhou Bay.Heavy metal pollution levels and instability are the most obvious in eastern Jiaozhou Bay,especially near the mouth of Licun river.2. Cu of Zn, Ba in EXC is mainly affected by the impact of land-based sources,sedimented largely in the estuary area. The distribution of Ca, Sr and Mn in CARB iscontrolled by the carbonate composition. Pb, Zn, Cu, Cr, V, Ni,Co is mainlyinfluenced by the sources. The migration process of Al, Fe, Ni, V in ERO are directlycontrolled by FeOOH-MnO2, Cu, Zn, Mn, Pb, Cr and Co are influenced byFeOOH-MnO2observably. The contents of these metals in ERO in each station aresimilar, which proclaim metals in ERO and FeOOH-MnO2are stable. The contents ofCr and Ba in OSM,which is higher in Eastern jiaozhou bay,are controlled by organiacarbon. The contents of V, Ni, Al and Fe in OSM are influenced by sources.3. The vertical distribution of CaCO3and FeOOH-MnO2in the sediment core isuniform. the species distribution, the content and the finfluencing factors of metallicelement in different depth is consistent and similar to the surface sediments ofJiaozhou Bay and Qingdao inshore. The vertical variation of non-residual content ofmetal element increased gradually. In the second layer, the content of metals mostlyreached a high value and declined. In summary, pollutional and ecological risk of Cu,Pb, Zn, Ni, Ba and Sr have been increased. The source of Sr is crustal source. Ba, Ni,V and Pb are moderate enrichment. Pb is affected most severely by human activities.