神农架大九湖PAHs多介质归趋模拟  

Multimedia fate modeling of PAHs in Dajiuhu,Shennongjia

作　　者：廖婷 邢新丽 石明明 刘威杰 程铖 胡天鹏 祁士华 Liao Ting;Xing Xinli;Shi Mingming;Liu Weijie;Cheng Cheng;Hu Tianpeng;Qi Shihua(School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences(Wuhan),Wuhan 430078,China)

机构地区：[1]中国地质大学(武汉)环境学院,武汉430078 [2]中国地质大学(武汉)生物地质与环境地质国家重点实验室,武汉430078

出　　处：《地质科技通报》2020年第5期148-155,共8页Bulletin of Geological Science and Technology

基　　金：国家自然科学基金项目(41773124);中央高校基本科研业务费专项资金资助项目(CUGL170208);中国地质大学(武汉)教学实验室开放基金项目(SKJ2018053)。

摘　　要：选择美国环境保护署EPA优控污染物NaP(萘)、Phe(菲)、Fla(荧蒽)、BaA(苯并[a]蒽)、Chr(屈)、Pyr(芘)和BaP(苯并[a]芘)7种多环芳烃(polycyclic aromatic hydrocarbons,简称PAHs)作为研究对象,采用LevelⅢ逸度模型对神农架大九湖地区PAHs多介质归趋进行了模拟,并利用神龙架大九湖大气、土壤、水体和沉积物中PAHs的实际监测数据对模型进行了验证;同时,将气候因素(温度、降水)对环境介质中PAHs转化的影响整合进模型中,探讨了气候变化对PAHs归趋的影响。结果表明:模型计算值与研究区PAHs监测值吻合良好,说明模型参数的选取合理可靠;不同PAHs的相间迁移通量具有一定差异,2环和3环PAHs则以沉积物向水体、水体向大气迁移为主,表现出由沉积物向水体和大气释放的特点,而4环和5环PAHs以大气向土壤和水体向沉积物迁移为主,体现出由大气向土壤和沉积物沉降的特点;温度与水-气、土-气和水-沉积物界面交换净通量存在明显的正相关关系,降水量与水-气、土-气界面交换净通量呈负相关关系,但与水-沉积物界面交换净通量呈正相关关系。本研究结果表明应重视因气候变化而引起的土壤、水体、沉积物的内源释放所造成的二次污染。A Level III fugacity model was used to simulate the fate of seven US-EPA priority polycyclic aromatic hydrocarbons(PAHs),including NaP,Phe,Fla,BaA,Chr,Pyr,and BaP,in Dajiuhu,Shennongjia.Monitoring data of PAHs in study areas were used to verify reliability of this model.Meanwhile,the influence of climate factors(i.e.,temperature and precipitation)on the transport of PAHs in different environmental media was integrated into the model to discuss the effect of climate change on the transport trend of PAHs in Dajiuhu.The results show that the data from model computation fits with the measured values of PAHs very well.The transfer flux of different PAHs between different phases is totally different.PHAs of ring 2 and ring 3 are dominated by sediments to water,water to air,indicating the characteristics of releasing from sediments to water and air;while PAHs of ring 4 and ring 5 are dominated by from air to soil and from water to sediments,reflecting the characteristics of deposition from air to soil and sediments.A significant positive correlation between temperature and net flux of water-air,soil-air and sediment-water interface was observed.There was a negative correlation between precipitation and net exchange flux at water-air and soil-air interfaces,while a positive correlation between precipitation and sediment-water interfaces.Our results suggested that attentions should be paid to the secondary pollution release from soil,water and sediment caused by climate change.

关 键 词：LevelⅢ逸度模型 大九湖 多环芳烃 多介质归趋 温度变化 

分 类 号：X508[环境科学与工程—环境工程]