珠江口水域中多环芳烃污染分布特征
首发时间:2018-05-02
摘要:珠江三角洲经济的快速发展,导致珠江三角洲水体和沉积物中积累了大量有毒的难降解的污染物,可能通过多种途径对水生生态系统和人体健康造成威胁。本文于2016年在珠江口采集样品,分析了水体、沉积物和颗粒物中的22种多环芳烃(Polycyclic aromatic hydrocarbons,PAHs)含量。结果表明,近二十年来,珠江口PAHs污染程度有所下降,与其他国家和地区相比处于中等水平。7种强致癌性PAHs在水体中含量较低,多分布在沉积物中,浓度范围为25.1-741.7 ng/g,占总量的13.72%-41.38%。水体中以2-3环PAHs为主,占总的22种PAHs的84.55%-98.71%。4环及4环以上的PAHs主要富集在颗粒物和沉积物中。TOC是影响珠江口PAHs归趋的重要因素,但是环境是一个复杂的综合体,PAHs分布还受到河流输入、海水稀释等诸多因素的影响。
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The distribution characteristics of polycyclic aromatic hydrocarbons in the Pearl River Estuary
Abstract:The rapidly economic development in the Pearl River Delta resulted in the accumulation of a large number of toxic and refractory organic pollutants, which may threaten the aquatic ecosystem and human health through various approaches. In this study, sediment, seawater and suspended particulate matter (SPM) samples were collected from the Pearl River Estuary in 2016, and 22 polycyclic aromatic hydrocarbons (PAHs) were analyzed. The results showed that the pollution level of PAHs was decreasing during last 2The distribution characteristics of polycyclic aromatic hydrocarbons in the Pearl River Estuary0 years and was The distribution characteristics of polycyclic aromatic hydrocarbons in the Pearl River Estuaryat the medium level comparing with other regions. The concentrations of 7 strong carcinogenic PAHs in the seawateThe distribution characteristics of polycyclic aromatic hydrocarbons in the Pearl River Estuaryr were quite low, for most of them distributed in the sediments, with a range from 25.1 to 741.7 ng/g, accounting for 13.72% to 41.38% of the total PAHs. PAHs with 2-3 rings were dominated in the water phase, accounting for 84.55% to 98.71% of the total PAHs. PAHs with 4 or more rings were mainly enriched in the SPMs and sediments. TOC was an important factor affecting the fate of PAHs in the Pearl River Estuary, but for complexity of the real environment, the distribution of PAHs was also affected by many other factors including input of river water, dilution by seawater and so on.
Keywords: Pearl River Estuary polycyclic aromatic hydrocarbons sediment total organic carbon (TOC)
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