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对葫芦岛3条河流和锦州湾水体、沉积物中As的含量、分布和形态进行了研究。结果表明:葫芦岛的连山河和五里河未受到明显的As污染,沉积物总As含量低于10mg·kg-1,河水As含量低于10μg·L-1,茨山河下游紧邻葫芦岛锌厂,受到了一定程度的As污染,沉积物As含量达75.2mg·kg-1;五里河口区As污染非常严重,锌厂在该区排污口处沉积物As含量高达3176.1mg·kg-1,超过国家沉积物As标准158倍;受锌厂排污的影响,锦州湾As污染也很严重,沉积物中As最高含量达到569.5mg·kg-1,沉积物和孔隙水含量在剖面上具有相似的变化趋势,表明孔隙水As含量主要受沉积物As含量影响;锦州湾沉积物中As主要以可交换态存在,残渣态次之,盐酸提取态最少,表明锦州湾沉积物中As的活性很强,有大量的可交换态As随时会进入上覆水体,是重要的As释放源,而铁对As行为的影响占次要地位;沉积物中大量As的释放可能会对葫芦岛和锦州湾地区生态系统造成严重的威胁。
The content, distribution and morphology of As in sediments of three rivers in Huludao and Jinzhou Bay were studied. The results showed that Lianshan River and Wuli River in Huludao were not significantly contaminated with As, the total As content in sediments was less than 10 mg · kg-1, the As content in river water was less than 10 μg · L-1, The As concentration in the sediment was 75.2 mg · kg-1. As pollution in the Wuli estuary was very serious. As content in the effluent from the zinc plant was as high as 3176.1 mg · kg -1 , Which is 158 times higher than the As standard of national sediment. Due to the pollution of zinc plant, As contamination in Jinzhou Bay is also very serious. The highest As content in sediment reaches 569.5 mg · kg-1. The sediment and pore water content are similar in profile , Indicating that As content in pore water is mainly affected by the As content of sediments. As in the sediments of Jinzhou Bay mainly exists in the exchangeable state, followed by the residue, with the least amount of hydrochloric acid extracted, indicating that As activity in the sediments of Jinzhou Bay is very Strong, a large number of exchangeable As at any time into the overlying water, As is an important source of As release, while the impact of iron on the As behavior plays a minor role; the release of a large amount of As in sediments may Huludao and Jinzhou Bay Regional ecosystems pose a serious threat.