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2011~2014年每年对泛杭州湾海域36个站位采集表层沉积物样品,对沉积物样品中16种多环芳烃(PAHs)的含量进行检测,了解其浓度水平、空间分布特征以及组成结构,并通过结构组成进行来源解析。结果表明,2011~2014年该海域沉积物中PAHs处于中度污染水平,平均含量及其标准偏差分别为(116.03±15.26)×10~(-9)、(106.59±13.90)×10~(-9)、(129.05±14.37)×10~(-9)、(106.10±10.43)×10~(-9)。空间分布上,PAHs高值区主要集中于长江口以及舟山海域附近,近岸区域高于远岸区域,远岸区有个别相对高值区。单体PAH中,菲的含量最高,环数主要分布在3~5环,以高分子量为主;来源解析结果表明污染源主要是煤、木柴和生物质的燃烧,部分站位同时受到石油源影响。
From 2011 to 2014, samples of surface sediment were collected from 36 stations in the Pan-Hangzhou Bay, and the content of 16 PAHs in the sediment samples was measured to understand the concentration level, the spatial distribution characteristics and the composition, And through the composition of the source structure analysis. The results showed that PAHs were moderately contaminated in the sediments from 2011 to 2014, and the average contents and standard deviations were (116.03 ± 15.26) × 10 -9 and (106.59 ± 13.90) × 10 ~ (- 9), (129.05 ± 14.37) × 10 ~ (-9), (106.10 ± 10.43) × 10 ~ (-9). In the spatial distribution, the high value areas of PAHs are mainly concentrated in the vicinity of the Changjiang Estuary and the Zhoushan Sea Area, while the nearshore area is higher than that in the far shore area. There are some relatively high value areas in the far shore area. The content of phenanthrene in monomer PAH is the highest, the number of rings is mainly distributed in 3 ~ 5 rings, mainly in high molecular weight; the source analysis results show that the main sources of pollution are coal, firewood and biomass burning, and some of the stations are affected by petroleum sources at the same time .