临洪河口海域间隙水和沉积物中重金属分布研究

HEAVY METAL LEVELS IN PORE WATER AND SEDIMENT OF LINHONG RIVER MOUTH

为了研究近岸海域中重金属的分布情况及其潜在迁移趋势,以连云港临洪河口为研究对象,分析了间隙水和沉积物中Cu,Zn,Pb,Cd,Cr,As,Fe,Mn的含量。结果表明,沉积物中金属浓度的分布顺序为:Pb>Zn>As>Cr>Cu>Cd。同种重金属在沉积物中的含量高于间隙水中,表明了该水体中的重金属有从沉积物向上覆水扩散的可能趋势。统计分析结果表明,沉积物中的金属浓度之间发现存在明显的相关性;多数金属与Fe、Mn存在明显的浓度相关性,表明了Fe和Mn在河口系统的金属地球化学循环过程中起重要作用。

Total concentrations of heavy metals such as Cu, Zn, Pb, Cd, Cr, As, Fe, Mn, were determined in pore water and bottom sediments of Linhong river, Lianyungang to investigate metal levels and distribution in nearshore area. Results showed that the orders of metal concentrations in sediments were Pb〉Zn〉As〉Cr〉Cu〉Cd. For each metal, sediments presented the higher concentration then followed by pore water, which indicated the mobile trends of metals were from sediments to overlying water. Statistic analysis results showed that sig- nificant correlations were found among sediments, but significant corelations were found between some metals concentration and Fe （or/and Mn） concentration,which indicated that Fe and Mn play important roles in geochemical recycles of metals in this system.