东寨港红树林湿地沉积物中多环芳烃的空间分布特征及其来源解析  

Distribution Characteristics and Sources of Polycyclic Aromatic Hydrocarbons in Sediments of Dongzhai Harbor Mangrove Wetland

作　　者：温汉辉 郭源 胡凡 胡甜 谢先军 李雪红 WEN Hanhui;GUO Yuan;HU Fan;HU Tian;XIE Xianjun;LI Xuehong(No.940 Branch of Nonferrous Metals Geological Bureau of Guangdong Province,Qingyican 511520,China;School of Environmental Studies China University of Geosciences(Wzihan),Wuhan 430078,China;Liuting Street Office of Chengyang District of Qingdao City,Qingdao 266109,China)

机构地区：[1]广东省有色金属地质局九四〇队,广东清远511520 [2]中国地质大学(武汉)环境学院,湖北武汉430078 [3]青岛市城阳区流亭街道办事处,山东青岛266109

出　　处：《安全与环境工程》2023年第2期194-202,共9页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(41772255);中国地质调查局地质调查项目(DD20190304)。

摘　　要：多环芳烃(PAHs)作为典型的持久性有机污染物,广泛存在于环境中。红树林湿地沉积物易于吸收并累积PAHs,研究红树林湿地沉积物中PAHs的含量、污染水平和来源,对开展红树林环境保护、环境管理和污染物控制具有重要意义。采集海南东寨港红树林湿地表层沉积物和柱状沉积物,通过对比PAHs单体的相对含量分析其空间分布规律,并利用特征化合物法和主成分分析法对东寨港红树林湿地沉积物中PAHs的污染来源进行解析。结果表明:(1)东寨港红树林湿地表层沉积物中PAHs处于轻度污染水平,柱状沉积物中PAHs处于轻-中度污染水平,且沉积物中都以中-高环PAHs为主;(2)演丰东河表层沉积物中PAHs污染水平远高于演丰西河表层沉积物,表层沉积物中PAHs污染程度与红树林和污染源分布特征以及水动力条件有关;(3)相关性分析结果显示,东寨港红树林湿地表层沉积物中PAHs水平分布主要受污染源直接输入的影响,pH值、盐度和TOC均不是影响研究区表层沉积物中PAHs水平分布的主要因素;(4)东寨港红树林湿地沉积物中PAHs的污染来源与当地居民的生活和生产方式密切相关,污染源类型主要为煤炭燃烧源、生物质燃烧源、交通源。Polycyclic aromatic hydrocarbons(PAHs)are typical persistent organic pollutants,which are widely present in the environment.Mangrove wetland sediments can absorb and accumulate PAHs.Therefore,it is important to identify the pollution level and source of PAHs in sediments for environmentai protection and pollutant control in mangroves.The content of PAHs and their spatial distribution patterns were investigated by collecting surface and columnar sediments from mangrove wetland in Dongzhai Harbor,Hainan.Factor and principal component analysis were used to analyze the sources of PAHs in sediments.The results are as follow:①The surface sediment of Dongzhai Harbor mangrove wetland is slightly polluted by PAHs,and the PAHs in the column sediment are in light-moderate pollution levels with medium-high ring PAHs dominating;②The level of PAHs contamination in the surface sediment of the Yanfeng East River is much higher than that of the Yanfeng West River,and the degree of PAHs contamination in surface sediment is related to the distribution characteristics of mangroves and pollution sources as well as hydrodynamic conditions;③The results of the correlation analysis shows that the distribution of PAHs in surface sediment in the mangrove wetland of Dongzhai Harbour is mainly influenced by direct inputs from pollution sources,and that pH,salinity,and TOC were not the main factors affecting the distribution of PAHs levels in the study area;④The sources of PAHs in the mangrove wetland of Dongzhai Harbour are closely related to the lifestyle and production patterns o£local residents,with the main types of pollution sources being coal combustion source,biomass combustion source,and traffic source.

关 键 词：东寨港红树林湿地 沉积物 多环芳烃 空间分布 来源解析 生态风险 

分 类 号：X53[环境科学与工程—环境工程] X14