广东红海湾表层沉积物重金属含量的空间分布特征与污染状况评价

发布时间：2018-06-08 00:39

本文选题：沉积物 + 重金属　；参考：《生态环境学报》2017年05期

【摘要】：对红海湾近岸海域20个采样站沉积物样品中的7种重金属含量分布进行了研究,结果表明:该海域表层沉积物中Cu、Pb、Zn、Cd、Cr、Hg和As质量分数范围分别为2.60~13.30、16.70~38.00、45.20~81.10、0.00~0.11、10.40~23.10、0.03~0.50、6.42~10.20 mg·kg~(-1),平均值分别为6.29、25.44、57.87、0.03、15.32、0.07、7.97 mg·kg~(-1),其中,Cu、Zn、Cd、Cr和Hg平均值低于全国海岸带重金属的背景值。海洋沉积物质量单因子污染指数法评价结果显示,Cu、Pb、Zn、Cd、Cr、Hg和As的平均含量均符合海洋沉积物质量Ⅰ类标准,7种重金属平均含量的污染程度为PbAsZnHgCrCuCd。潜在生态危害指数法评价结果显示,红海湾近岸海域潜在生态风险指数等级"较低",海洋生态环境状况较好;结合重金属富集程度分析,该海域Pb的富集程度较高且集中于近岸海域。表层沉积物中重金属和TOC相关性分析表明:该海域表层沉积物TOC含量与重金属Cu、Pb、Zn、Cr和As含量具有一定的正相关性。进一步通过主成分分析研究沉积物中重金属污染来源,发现前2个主成分的贡献率分别为60.41%和16.48%;结合相关性分析,认为该海域沉积物重金属Cu、Pb、Zn、Cr和As的主要来源为工业废水与城市污水。文章揭示了红海湾近岸海域沉积物中重金属的分布特征,可为海洋生态环境建设提供依据。
[Abstract]:The distribution of seven heavy metals in sediment samples from 20 sampling stations in the coastal waters of Red Bay was studied. The results show that the mass fraction range of CuPbPbZn ~ (2 +) ~ (2 +) CD ~ (2 +) ~ (2 +) ~ (2 +) in the surface sediments is 2.60 ~ 13.30 ~ 16.70 ~ 38.00 ~ 38.00 ~ 45.20 ~ 81.100.000.110.10 ~ (10.40) 0.50 ~ (6.42) ~ 10.20 mg 路kg ~ (-1) ~ (-1), the average value is 6.2925.44 ~ 57.87 ~ 0.07 ~ 15.32 ~ 0.07 ~ 7.97 mg 路kg ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1). The results of the single-factor pollution index method for marine sediment quality showed that the average contents of CuPbPbPbPbPbCzczcccccdand as were in accordance with the marine sediment quality class I standard. The pollution degree of the seven heavy metals was PbAsZnHgCrCuCd. the results showed that the average content of the seven heavy metals was PbAsZnHgCrCuCd. The evaluation results of potential ecological hazard index method show that the index grade of potential ecological risk in the coastal waters of the Red Bay is "lower" and the marine ecological environment is in good condition. The concentration of Pb in this area is relatively high and concentrated in the coastal waters. The correlation analysis between heavy metals and TOC in surface sediments shows that there is a positive correlation between TOC content and the contents of heavy metal CuPbPbZN Cr and as in the surface sediments of this sea area. The contribution rates of the first two principal components were 60.41% and 16.48%, respectively. It is considered that the main sources of heavy metals, CuPbPb, ZnN, Cr and as in the sediments of this area are industrial wastewater and municipal sewage. This paper reveals the distribution characteristics of heavy metals in sediments in the coastal waters of the Red Bay, which can provide a basis for the construction of marine ecological environment.
【作者单位】：国家海洋环境监测中心;
【基金】：国家海洋局海域管理技术重点实验室开放研究基金项目(201212) 大连理工大学海岸和近岸工程国家重点实验室基金项目(LP1501)
【分类号】：X55;X820

【相似文献】