| 摘要: |
| 为了解汕头南部近岸海域沉积物重金属空间分布、污染程度、潜在生态风险、影响因素和潜在来源,对汕头南部近岸海域35个沉积物样品中的环境因子(pH、TOC、TP和TN)和重金属(Cr、Cu、Zn、Cd、Pb、Hg和As)进行统计分析。采用地累积指数法、潜在生态风险和潜在生态风险综合指数对重金属污染程度和生态风险进行评价,采用相关性分析和聚类分析对影响重金属累积的环境因子和来源进行解析。统计结果表明,重金属Zn、Cr、Pb、Cu、As和Cd含量均超过了区域背景值,存在一定程度的积累现象。地累积指数(Igeo)、潜在生态风险指数()和潜在生态风险综合指数(RI)评价结果表明,重金属Zn和Cd为轻-中度污染水平,其中重金属Cd为中度生态风险,沉积物重金属总体属于轻度生态风险。相关性和聚类分析结果表明,TN、TP和TOC是影响汕头南部近岸海域沉积物重金属分布的环境因子,且对自然来源的重金属Cr、Cu和Zn影响显著,对人为来源的重金属Cd和Pb、重金属Hg和As影响相对较小。 |
| 关键词: 重金属 近岸海域 沉积物 污染特征 来源解析 |
| DOI： |
| 投稿时间：2024-03-11修订日期：2024-04-14 |
| 基金项目:中国地质调查局地调惠州-汕尾海岸带自然资源综合调查项目（DD20230415） |
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| Pollution characteristics and source analysis of heavy metal in coastal sediments in southern Shantou |
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| Abstract: |
| In order to comprehend the spatial distribution, pollution severity, potential ecological risks, influencing factors, and potential sources of heavy metals in the sediments of the nearshore waters in southern Shantou, a statistical analysis was conducted on 35 sediment samples, examining physicochemical indicators (pH, TOC, TP, and TN) and heavy metals (Cr, Cu, Zn, Cd, Pb, Hg, and As). Local accumulation index method, potential ecological risk and potential ecological risk composite index were used to evaluate the heavy metal pollution degree and ecological risk, and correlation analysis and cluster analysis were used to analyze the environmental factors and sources affecting the accumulation of heavy metals. The statistical results reveal that the concentrations of heavy metals Zn, Cr, Pb, Cu, As, and Cd all exceed the regional background values, indicating a certain level of accumulation. The evaluation results of soil accumulation index (Igeo), potential ecological risk index () and potential ecological risk index (RI) showed that heavy metals Zn and Cd were light to moderate pollution levels, among which heavy metal Cd was moderate ecological risk, and heavy metals in sediments were light ecological risk overall. The results of correlation and cluster analysis show that TN, TP and TOC are the environmental factors that affect the distribution of heavy metals in the sediments near the southern coastal area of Shantou, and have significant effects on the natural sources of heavy metals Cr, Cu and Zn, while the anthropogenic sources of heavy metals Cd and Pb, Hg and As are relatively small. |
| Key words: heavy metal coastal sediment pollution characteristics source analysis |
