珠江磨刀门河口表层沉积物中重金属的分布特征及生态风险评价

Distribution characteristics and ecological risk assessment of heavy metals in surface sediments in Modaomen distributary mouth of Pearl River Estuary

摘要: 本文测定了磨刀门河口76个表层沉积物样品中Zn、Cu、Mn、Pb、Ni、Cr、Cd7种元素的含量，并对其分布特征、来源与沉积环境的影响、风险评价等进行分析。结果表明，研究区域中的Cu、Mn、Ni、Pb、Cd元素主要源于磨刀门河口的输入，Zn和Cr则具有多种来源；沉积物粒度特征是影响Cu、Mn、Ni、Pb、Cr5种元素分布的主控因素；研究区潜在生态风险整体情况较为严重，表层沉积物的生态风险的主要由Cd元素引起。

Abstract: This paper determined the concentrations of 7 heavy metals including Cu, Zn, Mn, Ni, Pb, Cr and Cd in 76 sediment samples collected from Modaomen estuary, and analyzed the distribution characteristics, sources, effects of sedimentary environment and ecological risk of these elements. The results indicated that Cu、Mn、Ni、Pb and Cd in the study area came mainly from the Modaomen, and Zn、Cr had various sources. Characteristic of sediment grain size was the main factor that influenced the distribution of 5 elements including Cu、Mn、Ni、Pb and Cr. The potential ecological risk of the study area was generally serious, and the ecological risk of the surface sediments was mainly caused by Cd.