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沈阳地区多介质环境样品中全氟有机化合物和挥发性有机污染物分布特征及生态风险评估
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摘要
沈阳是我国重要的重工业基地之一,数十年的工业发展将大量的有机污染物质带入周边环境中,这些污染物质在环境中积累,并通过大气、水体、土壤或食物链直接或间接地威胁人类健康。
     本文以沈阳西部浑河、细河、蒲河和沈抚灌区沿岸为研究区域。通过研究挥发性有机污染物(VOCs)和全氟有机化合物(PFCs)在水、土壤和生物中的积累与分布,评估可能存在的风险。本文得到以下主要结果:
     1.本研究测得沈阳市区地表水中PFOS及PFOA的平均浓度分别为1.28 ng/L和3.67 ng/L,两者污染水平相当。沈阳市水体中普遍存在PFOS和PFOA污染,但与长江三角洲相比处于较低水平。
     2.在浑河的沈阳上游段,PFASs与PFCAs相比占有PFCs的比较低(PFASs/PFCAs:0.05~0.20),在流经沈阳市区后,PFASs占的比重明显增加((PFASs/PFCAs:0.24~0.53)。细河中PFASs与PFCAs的比值为0.73~1.44。
     3.除了浑河与细河合并处站点的PFOS含量丰水期低于枯水期外,枯水期与丰水期的PFOS及PFOA的浓度未见明显不同。
     4.沈阳市浑河、细河、蒲河,杭州市钱塘江水及上海市长江水中PFOS环境暴露浓度对鱼类、水生浮游生物及藻类的风险表征结果表明上述地区地表中PFOS属于低风险水平,上述水体不会对鱼类、水生浮游生物类及藻类产生急性毒性效应。
     5.沈阳地区人群通过鱼肉、禽肉和饮用水途径摄入的PFOS及PFOA的危害比值均小于1,即不存在对当地人群的急性毒性效应。
     6.沈阳地区地表水VOCs污染主要集中在细河,且细河沿岸地下水的VOCs污染严重。沈阳市彰驿镇双树坨子村处河水及地下水均受到VOCs污染,且对当地人群存在致癌风险与非致癌健康风险。
Shenyang is an important heavy industry base in northeast of China. Organic contaminants were carried into the surrounding environment with the development of economy, and these chemicals may pose immediate or potential harm to human health through air, water, soil or food chain.
     The present study focused on the accumulation and distribution patterns of perfluorinated compounds (PFCs) and volatile oraganic compounds (VOCs) in water, soil and some biota samples from the Hunhe River, Xihe River, Puhe River and Shenfu Irrigation Channel in the Shenyang area. Potential ecological risk was assessed based on the distribution of contaminants in multimedia. The major results were following:
     1. PFOS and PFOA were ubiquitous in water body in the Shenyang area. The mean concentration of PFOS and PFOA in surface water samples from Shenyang area is 1.28 ng/L and 3.67 ng/L, much lower compared with that in water samples from the Yangtze river delta.
     2. PFASs occurred at considerably lower levels than those of PFCAs in water samples from upstream of Hunhe River (PFASs/PFCAs: 0.05-0.20), and the ratio of PFASs became higher after flowing through Shenyang city (PFASs/PFCAs: 0.24-0.53). Ratio of PFASs/PFCAs was 0.73-1.44 in the Xihe River. The different contributions of PFASs and PFCAs to the total PFCs indicated that sources of PFCs were different among rivers.
     3. No significant difference of PFOS and PFOA concentrations was found between water samples collected in high flow period and drought period, except that PFOS concentration in water collected in Huanglatuo in high flow period was lower than that collected in drought period.
     4. Aquatic ecological risk assessment of PFOS in water bodies was performed using hazard quotient method. The result showed that the ecological risk of PFOS in water from Shenyang, Hangzhou and Shanghai is in relatively low level, suggesting no immediate harm to fish, zooplankton, and algae.
     5. Public health risk through consumption of fish, poultry meat and drinking water was assessed by estimating the hazard ratio (HR). The HRs of non-cancer risk based on PFOS and PFOA concentrations were less than unity. These findings suggest that the prevalent concentrations of PFCs are unlikely to cause immediate harm to local population.
     6. Detection rates of volatile organic compounds in the Xihe River were higher than that in other surface water from the Shenyang area. Both river water and ground water samples collected in the adjacent area of Shuangshutuo were polluted by VOCs and exhibit appreciable cancer risk and non-cancer risk to local residents.
引文
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