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2012年,每两个月采集1次浙江省舟山近海水样及表层沉积物样品,检测16种多环芳烃(PAHs)含量.结果表明,舟山近海水体和沉积物中PAHs均存在显著的时空差异性,水体ΣPAHs浓度范围为382.3~816.9 ng·L-1,平均值为552.5ng·L-1;沉积物ΣPAHs含量范围为1017.9~3047.1 ng·g-1,平均值为2022.4 ng·g-1.空间分布上,水体ΣPAHs最大值和最小值分别出现在小洋山和燕窝山海域,而沉积物中分别出现在小洋山和朱家尖南沙海域.时间变化上,水体ΣPAHs最大值和最小值出现在10月和6月,而沉积物中分别出现在8月和6月.PAHs污染来源主要是油类排放和木柴、煤燃烧的共同叠加作用.结合PAHs的生物阈值,利用超标系数法评价舟山近海PAHs的生态风险,结果表明,ΣPAHs存在较低几率的潜在风险,但苊单体存在较高几率的潜在风险,二氢苊和芴可能存在生态风险.对水-沉积物界面PAHs的富集研究表明,舟山近海沉积物中富集了大量PAHs,富集系数(Kd值)岱山岛大于舟山本岛,并与沉积物的PAHs含量分布一致.
In 2012, the samples of near-sea water and surface sediment of Zhoushan, Zhejiang Province were collected every two months and the contents of 16 PAHs were detected.The results showed that PAHs in Zhoushan offshore waters and sediments had significant spatial and temporal differences The ΣPAHs concentration ranged from 382.3 to 816.9 ng · L-1 with an average value of 552.5 ng · L-1. The content of ΣPAHs in sediments ranged from 1017.9 to 3047.1 ng · g-1 with an average of 2022.4 ng · g-1 In the spatial distribution, the maximum and minimum values of ΣPAHs in water body appeared in the waters of Xiaoyang and Bird’s Nest respectively, while the sediments appeared in the waters of Xiaoyang and Zhujiajian Nansha respectively.With the change of time, the maximum and minimum of ΣPAHs Values appear in October and June, and the sediments appear in August and June respectively.The sources of PAHs pollution are mainly the combination of oil emission and firewood and coal burning.By combining the biological threshold of PAHs, The ecological risks of PAHs in Zhoushan off-shore were evaluated and the results showed that there was a low risk of ΣPAHs, but there was a potential risk of higher odds of monomer, and there was potential ecological risk of dihydrins and fluorenes. Enrichment studies show that Zhoushan offshore sediments Set a large number of PAHs, enrichment factor (Kd value) is greater than Daishan Zhoushan Island, with uniform distribution of PAHs in sediments.