湛江湾陆源入海排污口沉积物中PAHs的来源及环境意义

Distribution and sources of PAHs in the sediments of land-based sewage outlet to Zhanjiang bay and their environment significance

为调查和研究湛江湾PAHs污染的陆源输入特征,本文分析研究了湛江湾11个陆源入海排污口(包括入海河流、人工渠和排污管道)沉积物中15种PAHs化合物的含量、空间分布及可能的排放源。结果表明,11个站位沉积物的∑PAHs含量范围为(28.1～1533.7)×10^(-9),区域分布特征明显;中心城区陆源输入是湛江湾PAHs污染的主要来源;PAHs的成分组成和异构体比值显示11个站位的PAHs排放源具有相似性,即主要源自煤、生物质和石化燃料燃烧,以及石油污染排放。本研究中,湛江湾陆源入海排污口PAHs来源及污染水平反映了该地区能源消耗结构特征及农业经济现状,对湛江市的发展规划、海洋环境管理和POPs污染控制具有一定的科学意义。

In order to investigate the sources inputs of PAHs into the Zhanjiang bay,this study has analyzed the compositions and spatial distributions of PAHs in the water way sediments of 11 main drainages into Zhanjiang bay.The results showed that∑PAHs concentrations ranged from 28.1×10-9 to 1533.7×10-9 in 11 sediment samples,and urban samples showed higher level of PAHs concentration than that of rural and suburban samples.This suggests that the inputs of PAHs from urban areas may be the major source of PAHs in Zhanjiang bay.The composition and ratios of PAHs isomers showed that PAHs were mainly derived from the combustion of coal,biomass and petrol,as well as petroleum related pollutions.It was also showed that the concentrations,spatial distribution and sources of PAHs were consistent with the energy consumption structure and agriculture economical statue of Zhanjiang district.Therefore,this study provided useful data for the economic development planning,marine environmental management and POPs pollution control of Zhanjiang bay area.