School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China.
School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, 510275, China.
Chemosphere. 2019 Jun;225:829-838. doi: 10.1016/j.chemosphere.2019.03.063. Epub 2019 Mar 12.
The aim of this study is to investigate the distribution, ecological risk and quantitative source apportionment of seven heavy metals in surface sediments along a partially mixed estuary (Modaomen, China). The study area was divided into three regions based on salt-freshwater mixing: a tidal river channel, weakly mixed zone and strongly mixed zone. The concentrations of Cu, Zn, Pb, Cd, Cr and Ni were significantly higher in the weakly mixed zone, while a higher Co content was found in the tidal river channel. From enrichment factor (EF) analyses, Cd was moderate to extreme severely enriched at most stations, and other heavy metals were minor enrichments. Adverse effects on aquatic biota may occur occasionally for all seven heavy metals based on the sediment quality guidelines (SQGs). The correlations between Al and heavy metals suggested that metals in sediments were mainly attributed to anthropogenic sources. Then Positive matrix factorization (PMF) and Geostatistic method were used to quantify the heavy metal sources and determine impacted regions. A mixed source from the inner Lingding Bay and West River contributed approximately 50% of the Cu, Zn, Pb, Cr and Ni. The electroplating industry accounted for about 57% of the Cd content, and the major contaminated area was concentrated at the confluence of the West River and its tributaries. The alloy industry contributed approximately 65% of the Co, most of which was near an industrial park.
本研究旨在调查中国部分混合河口（磨刀门）表层沉积物中七种重金属的分布、生态风险和定量源解析。根据盐淡水混合的情况，将研究区域分为三个区域：潮汐河道、弱混合区和强混合区。Cu、Zn、Pb、Cd、Cr 和 Ni 的浓度在弱混合区显著较高，而 Co 的浓度在潮汐河道中较高。从富集因子（EF）分析来看，Cd 在大多数站点处于中度到极度严重富集，其他重金属则处于轻微富集状态。根据沉积物质量基准（SQGs），所有七种重金属偶尔可能对水生生物群产生不利影响。Al 与重金属之间的相关性表明，沉积物中的金属主要来源于人为源。然后，采用正定矩阵因子分解（PMF）和地质统计方法对重金属源进行定量，并确定受影响区域。来自内伶仃岛和西航道的混合源约占 Cu、Zn、Pb、Cr 和 Ni 的 50%。电镀工业约占 Cd 含量的 57%，主要污染区域集中在西航道及其支流的交汇处。合金工业约占 Co 的 65%，其中大部分位于工业园区附近。
