珠江口海域表层沉积物重金属分布及风险评价研究  

Study on Distribution and Risk Assessment of Heavy Metals in Surface Sediments of the Pearl River Estuary

作　　者：高广银 唐灵刚 李学恒 苏丽薇 蔡茂欣 黄少斌 Gao Guangyin;Tang Linggang;Li Xueheng;Su Liwei;Cai Maoxin;Huang Shaobin(Guangzhou Geological Survey Institute,Guangzhou 510000,Guangdong,China)

机构地区：[1]广州市地质调查院,广东广州510000

出　　处：《绿色科技》2024年第24期166-172,共7页Journal of Green Science and Technology

基　　金：广州市海洋资源(无居民海岛)调查项目。

摘　　要：基于2021年10月(秋季)和2022年2月(冬季)珠江口南沙海域表层沉积物中的Cu、Pb、Cd、Zn、Cr、Hg、As7种重金属元素和有机碳TOC的调查结果,应用地累计指数法和潜在生态风险指数评价法评价调查海域表层沉积物环境质量和潜在生态风险,并利用主成分分析法初步探究了调查海域表层沉积物中重金属的主要来源。结果表明:调查海域表层沉积物重金属含量季节变化不显著,均符合第二类沉积物标准。沉积物中的铜、锌、铅和汞来源于工业生产、交通运输和农业生产污染,铬与其他重金属相关性弱,主要以残渣态存在。地累积指数法和潜在生态风险评价结果表明,调查海域砷处于中度污染状态,铬和镉无污染,汞处于较高生态风险,其他重金属潜在生态风险程度较低,调查海域整体为中等风险。Based on the investigation results of seven heavy metal elements(Cu,Pb,Cd,Zn,Cr,Hg and As)and total organic carbon(TOC)in the surface sediments of the Nansha Sea area of the Pearl River Estuary in October 2021(autumn)and February 2022(winter),this study applies the geo-accumulation index method and potential ecological risk index method to evaluate the environmental quality and potential ecological risk of the surface sediments.The main sources of heavy metals in the surface sediments in the surveyed sea area were preliminarily explored using the principal component analysis method.The results indicate that the seasonal variation of heavy metal content in surface sediments of the surveyed sea area is not significant and meets the criteria for ClassⅡsediments.Cu,Zn,Pb,and Hg in sediments come from industrial production,transportation,and agricultural pollution.Cr has weak correlation with other heavy metals and mainly exists in residual forms.The results of the geo-accumulation index method and potential ecological risk index indicate that As in the surveyed sea area is in a moderate pollution state;Cr and Cd are not polluted;Hg is at a high ecological risk,and the potential ecological risk level of other heavy metals is low.The overall surveyed sea area is at a moderate risk.

关 键 词：珠江口南沙海域 重金属 表层沉积物 生态风险 

分 类 号：P313[天文地球—固体地球物理学]