五大连池火山堰塞湖表层沉积物中重金属的分布特征及生态风险评价

摘要

以五大连池火山堰塞湖为研究对象,测定其表层沉积物中8种重金属元素(Cd、Cr、Cu、Hg、Ni、Zn、Pb及As)的含量,分析其分布特征并进行生态风险评价.结果表明:各池子表层沉积物中Hg的空间分布最不均匀;药泉湖中重金属总含量最高,体现了人类活动对湖泊生态的影响;单个及多种重金属的潜在生态危害指数均为轻微,但其中As和Hg与我国其他类似河流湖泊相比处于中等偏上的水平,必须提高监管力度,予以治理.%The content of heavy metals (Cd, Cr, Cu, Hg, Ni, Zn, Pb and As) in sediments of volcano dammed lake in Wudalianchi was researched and their distribution characteristics and ecological risk assessment was analyzed. The results show that the distribution of Hg was the most scattered. The total content of heavy metal in sediments of Drug Spring Lake was the highest, which reflected the influence of human activities on it. Potential ecological index of both the single and multiple heavy metal was slight, but the content of As and Hg in comparison with other similar rivers and lakes in our country was over the average level, which must be given vigilant and governance.