辽东湾潮间带底质重金属污染地累积指数评价

运用地累积指数法对辽东湾潮间带采集的底质样品的Cd、Pb、Cu和Zn污染程度进行了评价,结果表明,辽东湾潮间带重金属污染物主要是Cd,其次是Zn、Pb和Cu.各重金属污染较严重的地区分布在河口区,污染程度由高到低的顺序是:葫芦岛五里河桥下、大凌河口处、辽河口处、双台子河口处、永宁河口、熊岳河口、六股河口、石河口及芷锚湾.

Method on how to apply index of geoaccumulation to evaluate heavy metal pollution as result of inter-tidal sediments in Liaodong bay

This paper aims to discuss the influence of different geochemical backgrounds selected for assessing the metal pollution level in ocean floor sediments by using I_(geo). As we know, Muller index of geo-accumulation or I_(geo) has been used as a widely recognized index for metal pollution indicating the contamination level found in sediments. To reduce such influence, it is suggested that the geochemical backgrounds selected be made in close relation to the sediment itself. In order to find the accurate content of Cd, Pb, Cu and Zn in the sediments of river mouths in Liaodong Bay, the author of this paper has made a very careful quantitative analysis on the samples gained from the field investigation, in which the geoaccumulation index was used to evaluate the heavy metal pollution in the sediments of the Inter-tidal in Liaodong Bay. The results of the author's analysis on the contamination degree of such heavy metals have shown that Cd was in high level while Pb, Cu and Zn stand in the middle. The results also showed that heavy metals pollution proves rather serious in the river mouths of Liaodong Bay. The exact pollution degrees in the following sites are respectively: the pollution in Wulihe River mouth in Huludao city is more serious than Dalinghe River mouth and Liaohe River mouth, with the latter being more serious than that of Shuangtaizihe River mouth, Yongninghe River mouth, Xiongyuehe River mouth, Liuguhe River mouth, Shihe River mouth and Zhimaowan in turn.