日照市海岸带沉积物重金属元素分布特征研究

根据日照市海岸带两个重点海滩的沉积物调查资料,综合分析了重金属元素的分布特征。结果表明:由岸向海,森林公园海滩剖面样和海域表层样中重金属元素含量逐渐降低,万平口海滩剖面样中重金属含量逐渐减少,海域表层样中重金属含量先升高后降低;从北部到南部,森林公园海滩剖面样中重金属含量逐渐减少,万平口海滩剖面样中重金属含量先减少后增加,海域表层样中重金属含量变化不大。研究区重金属元素的含量与磁性物质的含量呈正相关,与沉积物的平均粒径呈明显负相关,符合元素粒度控制规律。沉积物中重金属元素等主要污染物含量较少,潜在生态危害系数较小,沉积物质量较好,污染程度较低。

Distribution Characteristics of Heavy Metals in Sediments of Rizhao Coastal Zone

Distribution characteristics of heavy metals have been analyzed in this paper based on sediments investigation data of the two key beaches in Rizhao coastal zone. It is showed that: the heavy metal content of beach samples and surface samples in Forest Park beach are decreasing gradually from the continent area to the ocean area. The heavy metal content of beach samples in Wanpingkou beach are decreasing gradually, while that of surface samples in this beach is increasing at first and then decreasing. The heavy metal content of beach samples in Forest Park beach are decreasing gradually from north to south, while that in Wanpingkou beach is decreasing at first and then increasing. The heavy metal content of surface samples in the study area have changed little. There is a positive correlation between heavy metal content and magnetic material content, however, a significant negative correlation between heavy metal content and average diameter. As showed by the result, the element contents correspond to the rule of the granularity controlling. The contents of heavy metal in sediments are low, the potential ecological risk index is less, the quality of sediments is good, and the pollution degree is low.