Characteristics and sources of heavy metal pollution in sediments of Zhanjiang Bay
The concentrations of seven heavy metals(Cd,Cr,Cu,Hg,As,Pb,and Zn)in 10 sediment samples collected from the Zhanjiang Bay in April 2020 were analyzed.The focus was on identifying the sources and assessing the ecological risks posed by these metals.The results show that Cu,Zn,Cr,and As meet the standards for Class I marine sediments,while Cd has the highest exceedance rate.The analysis of the geo-accumulation index and pollution load index reveals that Cd pollution in the sediment is the most severe,followed by Hg and Pb,while the pollution levels of Cu,As,Zn,and Cr are relatively low.Tracing the sources of these heavy metals,it is found that they are mainly derived from ship emissions,aquaculture discharge,industrial wastewater,municipal waste,and agricultural sources.The evaluation of the potential ecological risk index indicates a significant ecological risk associated with heavy metal pollution in Zhanjiang Bay,with Cd and Hg identified as key potential ecological risk factors.
Zhanjiang Bay areasedimentsheavy metalsgeo-accumulation indexpollution assessmentecological risk
国家科技期刊平台
NSTL
万方数据
