| Jinzhou Bay was one of areas suffering from serious pollution in China. In this study, 5 rivers samples, 20 sea water samples and corresponding sediment samples were collected in August 2009. A series of indexes such as CODMn, TN, TP, Oil, DIN, and PO4-P of sea water, TOC, Oil of sediments were measured. Meanwhile, the spatial-temporal variation of each index was discussed. On this basis, qualitative and quantitative research on n-alkanes, PAHs, steranes and terpenes of sediment samples were studied further. Using the characteristic ratio, their sources and instruction meanings were discussed. It is hoped that all the studies can provide a theoretical foundation and scientific basis for Jinzhou Bay.(1) The results of 5 rivers show that CODMn, TN, TP and Oil are all inferior to Class III water quality standard. The principal pollutants of Cishan River are TN and TP, Wuli and Lianshan River are TN and Oil, Tashan River is CODMn and Daxing River is Oil. The annual discharge loads of COD, TN, TP and Oil are 2728.9 t/a, 970.2 t/a, 73.83 t/a, 73.48 t/a, respectively.(2) Water quality assessment results show that the sea water of Jinzhou Bay meets the water function zoning demand. Concentrations of CODMn, DIN, PO4-P, Oil vary from 0.73 to 3.05mg/L, 0.141 to 0.343 mg/L, 0.009 to 0.019 mg/L , 0.055 to 0.150 mg/L, with averages of 1.17, 0.222, 0.014, 0.098 mg/L, respectively. E index method eutrophication evaluation shows that E> 1 sites are three, which are located near the estuary.(3) Concentrations of n-alkanes vary from 1.9 to 4.2μg·g-1 with an average 2.6μg·g-1 dry weight. n-Alkanes distribution patterns of all positions were characterized by one model: double peak-cluster, which means double sources from terrestrial and marine origin. The average value of L/H, C31/C19, TAR ratio are 0.67, 3.06, 2.02, respectively. All of these three indices suggest that the terrestrial contributions are higher than marine sources, especially No. 2, 3 and 7 stations, which were influenced by riverinput nearby. Carbon Preference Index (CPI) range from 1.19 to 2.63 with an average 1.73, which is close to 1; the ratio of Pristane/Phytane(Pr/Ph) and unresolved/resolved compounds(U/R) range from 0.91 to 1.28, 2.2 to 4.3, respectively. All of these three parameters indicate that No.13 and 15 stations are suffering from petroleum pollution. Comprehensive analysis of various parameters shows that Jinzhou Bay is threatened by both terrestrial inputs and petroleum hydrocarbons contaminations, which may be related to river discharging and port shipping in Jinzhou Bay.(4) The concentration of 16 PAHs in Jinzhou Bay sediments range from 133.44 to 593.91 ng·g-1, with the average of 262.15 ng·g-1, which are mainly composed of 46 rings. The petroleum hydrocarbons and TOC contents have sgnificantly related with∑PAHs, which means they play important roles with PAHs space distribution. The isomeric ratios suggested that combustion of fossil fuels and biomass were the main sources of PAHs pollution of Jinzhou bay. As for risk assessment results, high potential ecological risks of PAHs were not found in sediments of Jinzhou bay, but the existence of BbF, BkF, IND and BgP which had no minimum safe value indicated that Jinzhou bay had already existed potential adverse life impacts.(5) A series of hopanes and steranes are detected and the dominant peak is 17α(H),21β(H)-hopane and C29-steranes, respectively. 18α(H)-oleanane and gammacerane, which exists in Oil, are also found in the sediment. Geological hopane and sterane parameters show high maturity information of Jinzhou Bay. |
