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锦州湾沉积物典型有机物组成及来源研究
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摘要
本文以锦州湾区域为研究对象,于2009年8月采集了5条入海河流水样、海上20个站位的水样以及相应站位的沉积物样品,测定了水环境中的高锰酸盐指数(COD_(Mn))、总氮(TN)、总磷(TP)、石油烃、无机氮(DIN)、活性磷(PO4-P)等以及沉积物中的有机碳(TOC)、石油烃的含量,研究了各个指标的时空变化规律。在此基础上,进一步对沉积物中的正构烷烃、多环芳烃进行定性、定量研究,同时对甾烷、萜烷进行了定性研究,利用了特征比值法解释了它们的来源和指示意义,为锦州湾的水和沉积物研究提供了数据和科学依据。
     (1)陆源入海河流调查结果显示COD_(Mn)、TN、TP和石油类指标都超过Ⅲ类地表水环境质量标准,其中茨山河的主要污染物为总氮和总磷,五里河和连山河的主要污染物为总氮和油类,塔山河的主要污染物为高锰酸盐指数,大兴河的主要污染物为油类。锦州湾陆源污染物入海负荷分别为COD_(Mn) 2728.9 t/a、TN 970.2 t/a、TP 73.83 t/a和石油类73.48 t/a。
     (2)锦州湾海水水质总体上符合海洋功能区划的要求,COD_(Mn)含量为0.73 ~3.05mg/L,站位平均浓度为1.17mg/L;DIN含量为0.141~0.343 mg/L,站位平均浓度为0.222 mg/L,在五里河口和塔山河口附近含量较高,年际变化无明显规律性;PO4-P含量为0.009~0.019 mg/L,站位平均浓度为0.014 mg/L,在靠近五里河口处浓度较高,离河口渐远浓度逐渐递减,近两年有降低的趋势。油类含量为0.055~0.150 mg/L,站位平均浓度为0.098 mg/L,污染程度呈现逐年递增趋势。锦州湾富营养化(E)指数大于1的站位有三个,位于近岸的大兴河、塔山河和五里河口附近。
     (3)正构烷烃含量(∑n-alk)范围1.9~4.2μg·g~(-1),平均值2.6μg·g~(-1),各个站位组成特征相似,都表现为双峰型,显示了陆源与海源双重贡献特征。短/长链比值L/H均值为0.67,C_(31)/C_(19)均值3.06,类脂物比值TAR均值为2.02,三个参数显示锦州湾沉积物外来源陆源贡献值要大于海洋源,特别是2、3和7站位受到陆源河流输入影响较大。碳优势指数CPI范围1.19~2.63,均值1.73,接近于1;姥鲛烷和植烷比值Pr/Ph为0.91~1.28;样品中普遍存在不可分离化合物UCM,U/R比值为2.2~4.3,三个参数显示出13和15站位有石油输入特征。多种特征参数比值综合分析表明该海域受到了陆源输入和石油烃污染的威胁,这可能与锦州湾地区河流排污、港口航运有关。
     (4)锦州湾表层沉积物中16种PAHs总量为133.44~593.91 ng·g~(-1),平均值为262.15 ng·g~(-1),组成以4~6环PAHs为主。沉积物中石油烃、TOC数据和∑PAHs浓度相关性显著,说明石油烃和TOC对沉积物中PAHs的空间分布起着重要的作用。运用比值法对锦州湾表层沉积物多环芳烃进行了源解析,结果表明:沉积物的PAHs来源是以化石燃料、生物质的燃烧为主。生态风险评价表明:锦州湾近岸表层沉积物除一个站位的芴大于ERL值外,其他各站位表层沉积物中PAH均未超过ERL值,但已检测到苯并荧蒽成分,应引起足够的重视。
     (5)锦州湾沉积物检出了三环萜烷、藿烷和甾烷系列,藿烷以17α(H),21β(H)-藿烷最为丰富,甾烷以C_(29)规则甾烷最为丰富,同时检出了原油污染特征的奥利烷和伽马蜡烷。C_(31)αβ-S/(S+R)比值均大于0.6,Tm/Ts均值为1.0,C_(29)-ααα-S/(S+R)平均值为0.5,表明沉积物具有较高的成熟度。
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 COD_(Mn), 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 COD_(Mn), 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 COD_(Mn) 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 COD_(Mn), 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, C_(31)/C_(19), 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 4~6 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 C_(29)-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.
引文
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