| 摘要: |
| 本文对海南日月湾表层沉积物中重金属的浓度进行分析,探讨其分布特征、相关性、污染程度和来源。浓度分析结果表明,重金属平均浓度较低,均符合第一类海洋沉积物质量标准。根据中国浅海沉积物平均值计算的各重金属的地累积指数均小于0,日月湾海域的重金属处于无污染状态。相关性分析结果表明,Cu、Zn、Pb、Cr具有相同污染源,主要受到养殖污水及生活污水影响；此外,施工前后Cd、Hg、As、Cr的平均浓度差异不大,而Cu、Zn、Pb在施工期的浓度较高的结果也表明Cu、Zn、Pb受施工影响较大；As的变异系数最小、空间分布均匀且与其它重金属无明显相关性表明As其受地壳元素影响较大。与月岛拆除施工前相比,拆除施工后,大部分污染物浓度及生态风险值均降低,且它们的空间差异也减小,说明月岛拆除后减少了人类活动对沉积物中重金属的影响。 |
| 关键词: 海南日月湾 沉积物 重金属 地累积指数 污染来源。 |
| DOI： |
| 分类号:X52 |
| 基金项目:中央级公益性科研院所基本科研业务费专项资金 |
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| Distribution and pollution evaluation of heavy metal pollution in surface sediments of Riyue Bay, Hainan |
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| Abstract: |
| The content of heavy metals in sediments of Riyue Bay were studied. The results show that the mean concentrations of the selected heavy metals were relatively low from the Riyue Bay which can meet the first grade by the standard national standard of marine sediment quality. The index of geo-accumulation calculated by the average value of shallow sea sediments in China is less than 0 which tell us the heavy metals pollution of sediments in Riyue Bay are in a pollution-free state. Results of correlation analysis showed that Cu, Pb, Zn and Hg has the same source of impacts,mainly from the pollutants from mariculture and domestic sewage. Besides, the average concentrations of Cd, Hg, As and Cr have little difference before and after construction, while the high concentrations of Cu, Zn and Pb appeared in construction also indicate that Cu, Zn and Pb are greatly affected by construction. The characteristic of As which has minimum coefficient of variation, uniform spatial distribution and no significant correlation with other heavy metals shows that As is greatly influenced by crustal elements. |
| Key words: Riyue Bay of Hainan Sediment Heavy metal Index of geo-accumulation Source of pollution |
