三峡库区消落带土壤中多环芳烃的分布、来源及风险评价

发布时间：2018-04-15 14:59

  本文选题：多环芳烃 + 来源　； 参考：《武汉纺织大学》2017年硕士论文

【摘要】：多环芳烃是一类广泛存在于环境中的具有三致作用的持久性有机污染物,土壤是环境中多环芳烃一个重要的汇,经过各种途径释放进入到大气中的PAHs,最后都会通过干湿沉降进入到土壤中。三峡库区由于每年的“冬蓄夏泄”调度模式循环,使得消落带经历干湿交替的水位变化。消落带土壤中的多环芳烃又会重新进入水体,不仅造成土壤、水体的污染,而且对人类的健康产生了极大的威胁。本文对三峡库区消落带土壤中PAHs的分布、来源以及风险评价进行了系统研究。旨在了解三峡库区消落带土壤中的PAHs的污染状况和潜在风险,为三峡库区消落带PAHs的污染控制和治理提供科学依据。主要研究结果如下:研究结果表明,2012年6月与9月三峡库区消落带土壤中16种PAHs的总含量范围分别为18.40~392.29 ng/g(98.11 ng/g),23.30~259.22 ng/g(73.95 ng/g);2013年6月与8月三峡库区消落带土壤中16种PAHs的总含量范围分别为54.00~463.08 ng/g(143.66 ng/g),63.68~558.76 ng/g(175.50 ng/g)。上游采样点土壤中PAHs含量明显高于中下游采样点含量。消落带土壤中PAHs污染样点主要在上游居多,且污染物含量有增长的趋势。组成特征分析显示,消落带土壤中PAHs主要是以低环为主。PAHs与TOC的相关性分析结果显示,土壤中PAHs含量与TOC没有明显相关性,不同环数PAHs与TOC没有明显相关性。由比值法分析可知,三峡库区消落带土壤中PAHs来源于煤、生物质和石油类燃烧,其次是石油源。生态风险评价表明三峡库区消落带土壤中PAHs生态风险较小,健康风险评价表明该区域潜在致癌风险值有增加的趋势,ILCRs值在10-9~10-6之间,表明三峡库区消落带土壤中PAHs的致癌风险很小。
[Abstract]:Polycyclic aromatic hydrocarbons (PAHs) are a class of environmental persistent organic pollutants (pops), and soil is an important sink of PAHs in the environment.PAHs released into the atmosphere through various channels will eventually enter the soil through wet and dry deposition.Because of the annual circulation of "winter storage and summer release" in the three Gorges Reservoir area, the water level of the fluctuating zone experienced the alternation of dry and wet.The polycyclic aromatic hydrocarbons (PAHs) in the soil will re-enter the water body, which not only causes soil and water pollution, but also poses a great threat to human health.In this paper, the distribution, source and risk assessment of PAHs in the soil of the three Gorges Reservoir area are studied systematically.The purpose of this paper is to understand the pollution status and potential risk of PAHs in the soil of the three Gorges Reservoir area, and to provide scientific basis for the control and control of PAHs pollution in the three Gorges Reservoir area.The main results are as follows: the results show that the total contents of 16 kinds of PAHs in the soil of the three Gorges area in June and September 2012 are 18.40 ~ 392.29 ng/g(98.11 / g / g ~ (23. 30) ~ 259.22 ng/g(73.95 / g ~ (-1), respectively, and the total content of 16 kinds of PAHs in the soil of the three Gorges area in June and August 2013.The range of content is 54.00 ~ 463.08 ng/g(143.66 / ng / g ~ (-1) 63.68 ~ 558.76 ng/g(175.50 / g ~ (-1).The content of PAHs in the soil of the upstream sampling site was significantly higher than that in the middle and lower reaches of the soil.The PAHs pollution samples were mainly in the upper reaches of the soil and the content of the pollutants was increasing.The results of composition analysis showed that the correlation between PAHs and TOC was mainly low ring. The results showed that there was no significant correlation between PAHs content and TOC in soil, but there was no significant correlation between PAHs and TOC in different ring numbers.According to the ratio analysis, the PAHs in the soil of the three Gorges Reservoir area is derived from the combustion of coal, biomass and petroleum, followed by the source of oil.The ecological risk assessment showed that the ecological risk of PAHs in the soil of the three Gorges Reservoir area was small, and the health risk evaluation indicated that the potential carcinogenic risk value of the region was increasing with ILCRs between 10 ~ (-9) and 10 ~ (-6).The results showed that the carcinogenic risk of PAHs in the soil of the three Gorges Reservoir area was very small.
【学位授予单位】：武汉纺织大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X53

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