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2010年在曼谷湾(泰国湾北部)及其北部主要河口(湄干河、拉塞河、湄南河和邦巴功河)采集了46个表层沉积物样品,分析了样品中重金属元素(Cd、Co、Cu、Pb、Zn)的含量水平,并用Al均一化数据,获得消除了粒度效应的重金属地球化学特征.利用1mol/L的HCl对该区沉积物进行了处理,通过分析沉积物重金属在酸溶相和残渣相的分布,揭示其生物有效性.结果表明,曼谷湾周边河流沉积物中重金属元素含量明显高于曼谷湾;曼谷湾沉积物中重金属(Co、Cu、Pb、Zn)从北向南随着离岸距离的增加而增加,Cd没有明显分布规律;地累积指数显示Cd和Pb存在显著的地球化学富集特征.Cd和Pb在酸溶相中的比例相对较高,表明其生物有效性较高,易引发二次污染.
In 2010, 46 surface sediment samples were collected from the Bay of Bengal (northern Gulf of Thailand) and its northern major estuaries (the Maegan, Rassai, Chao Phraya and Bangpong rivers), and the contents of heavy metal elements (Cd, Co, Cu, Pb, Zn) were determined and the geochemical characteristics of heavy metals that eliminated the grain size effect were obtained by using Al homogenization data.The sediments in this area were treated with 1 mol / L HCl, The results showed that the contents of heavy metals in river sediments around Bangkok Bay were significantly higher than those in Bangkok Bay. The concentrations of heavy metals (Co, Cu, Pb, Zn) in the sediments of Bangkok Bay from There is no obvious distribution of Cd in the north and south directions, and Cd and Pb show obvious geochemical enrichment characteristics in the Cumulative index.Cd and Pb are relatively high in the acid-soluble phase, indicating that Bioavailability is high, easily lead to secondary pollution.