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High concentrations of PAHs in sediments are usually high in highly industrialized and urbanized locations [3,4]. Moreover, highly anthropogenic activities are generally recognized to be the most important source of PAHs release into the environment [5]. At coastal areas, anthropogenic polycyclic aromatic hydrocarbons are introduced via urban runoff [6], industrial processes, vehicle exhausts, and spillage of fossil fuels [7]. Meanwhile, heavy metals discharged into a river system by natural or anthropogenic sources during their transport are distributed between the aqueous phase and bed sediments. Therefore, sediments are regarded as the ultimate sinks for heavy metal cations [8]. Heavy metal residing in contaminated habitats may accumulate in microorganisms, aquatic flora and fauna, which in turn may enter the human food chain and result in health problems [9,10].
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