海南岛东寨港沉积物中重金属人为污染富集因子及来源分析

The Analysis on the Enrichment Factors and Source of Heavy Metal Pollution in Sediments of Dongzhai Port,Hainan Island

在系统采集海南岛东寨港表层和深层沉积物样品的基础上,采用富集因子法等对表层沉积物的重金属污染进行了评价。结果表明:(1)研究区表层沉积物中Cd、Cr、Cu、Hg、Ni和Zn 6种元素含量略高于琼州海峡沉积物背景值;(2)地累积指数评价结果表明,研究区表层沉积物中As和Pb 2种重金属元素属于清洁水平;Zn元素处于轻-重污染等级;(3)研究区表层沉积物中Cr、Cu、Ni、Pb、Zn 5种重金属以轻微污染为主,As、Cd和Hg为轻微污染和中度污染,上述受污染区主要分布在靠近演海镇和演丰镇人类相对密集的区域,以及东寨港西岸人群较聚集的地区;(4)研究区沉积物中As元素与农业活动来源有关,Cd、Cr、Cu、Hg、Ni、Pb和Zn与岩石风化及工业活动来源有关。

Based on the systematic collection of surface and deep sediment samples in Dongzhai Harbor,Hainan Island,the heavy metal pollution in surface sediments was evaluated by single factor pollution index method.The results showed as follows:(1)the contents of Cd,Cr,Cu,Hg,Ni and Zn 6 in surface sediments in the study area were slightly higher than the background values of Qiongzhou Strait sediments;(2)the results of soil accumulation index showed that the heavy metals As and Pb in the surface sediments of the study area belonged to the clean level,Zn is in light to heavy pollution level;(3)in the surface sediments of the study area,the anthropogenic pollution of Cr,Cu,Ni,Pb and Zn were mainly light pollution,and the anthropogenic pollution of As,Cd and Hg were light pollution and moderate pollution.The above-mentioned polluted areas were mainly distributed in the relatively densely populated areas near Yanhai Town and Yanfeng Town,as well as the west bank of Dongzhai Port where people gathered;(4)As in the sediments of the study area are related to the sources of agricultural activities,Cd,Cr,Cu,Hg,Ni,Pb and Zn are related to rock weathering and industrial activities.