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渤海湾重金属的自然沉积分布受沉积环境和沉积物粒度组成的控制,可以Ni的分布为代表模式。在自然沉积的背景上某些金属在大沽口和北塘口附近水深<3—5m的河口潮间带,迭加了一人为的排污影响带,可以Pb的分布为代表模式。且据此可划分出渤海湾的重金属背景区。利用背景区细粒级类型沉积物重金属含量的上限值作为渤海湾细粒沉积物的背景值。河口重金属的积累,相对来说并不严重这与输沙量大及高沉积速率有关。
The natural sedimentary distribution of heavy metals in the Bohai Gulf is controlled by the sedimentary environment and the grain size composition of the sediments, and the Ni distribution can be taken as the representative model. In the natural sedimentary background, some metals superimposed a man-made influence zone on the estuarine intertidal zone with water depth <3-5m near the Dagu and Beitang ports and can be represented by the Pb distribution. According to this, the heavy metal background area of Bohai Bay can be divided. The upper limit of the heavy metal content of the fine-grained sediments in the background area is used as the background value of the fine-grained sediments in the Bohai Bay. The accumulation of heavy metals in the estuary is relatively not serious, which is related to the large amount of sediment transport and the high sedimentation rate.