地质与资源2026，Vol.35Issue(4)：475-484,10.DOI:10.13686/j.cnki.dzyzy.2026.04.011
广西防城港东湾表层沉积物重金属分布特征及生态风险评价
Spatial distribution and ecological risk assessment of heavy metals in surface sediments of Dongwan Bay,Fangchenggang,Guangxi
摘要
Abstract
To assess the contamination status of heavy metals in surface sediments of Dongwan Bay,Fangchenggang City,twenty sediment samples were collected to determine the concentrations of five heavy metals(As,Hg,Cu,Pb,and Zn).The spatial distribution,contamination levels,potential ecological risks,and source apportionment of these metals were analyzed.The results showed that the concentrations of the five heavy metals ranged as follows:As 2.06×10-6-21.1×10-6,Hg 0.012×10-6-0.054×10-6,Cu 5.61×10-6-59×10-6,Pb 5.11×10-6-55.1×10-6,and Zn 13.0×10-6-65.6×10-6.The mean concentrations decreased in the order Zn＞Cu＞Pb＞As＞Hg,and all fell below the Class Ⅰ limits of China's marine sediment quality standards.Compared with levels reported in other regions,the heavy metal concentrations in sediments of Dongwan Bay were relatively low.Both the pollution index and the geoaccumulation index(Igeo)indicated varying degrees of contamination for individual metals and across sampling sites,attributed primarily to anthropogenic activities and riverine inputs.The potential ecological risk assessment revealed that the overall ecological risk was predominantly governed by Hg.Correlation analysis and principal component analysis(PCA)further demonstrated that Cu and Pb were mainly derived from industrial emissions,while the enrichment of As and Zn was largely associated with industrial activities and cage aquaculture.Hg was primarily controlled by domestic sewage and ship navigation.The variance contribution rates of the principal components,representing the Cu-Pb,As-Zn,and Hg associations,were 57.83％,19.22％,and 14.47％,respectively.关键词
海岸带/沉积物/重金属/生态风险/广西Key words
coastal zone/sediment/heavy metal/ecological risk/Guangxi Region分类
天文与地球科学引用本文复制引用
赵俊超,杨源祯,庞国涛,闫兴国,欧涛,黄戎葵..广西防城港东湾表层沉积物重金属分布特征及生态风险评价[J].地质与资源,2026,35(4):475-484,10.基金项目
中国地质调查局项目"广西北仑河口-茅尾海一带重要红树林湿地资源调查"(ZD20220131) （ZD20220131）
"黄河三角洲1∶25万地表基质调查"(DD20242043). （DD20242043）
