Temporal and spatial variations of heavy metals in urban riverine sediment: An example of Shenzhen River, Pearl River Delta, China
Temporal and spatial variations of heavy metals in urban riverine sediment: An example of Shenzhen River, Pearl River Delta, China
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DOI：
10.1016/j.quaint.2011.05.026
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发表时间：
2012-12-19
影响因子：
2.2
通讯作者：
Lu, Xixi
中科院分区：
文献类型：
--
作者：
Huang, Yilong;Zhu, Wenbo;Lu, Xixi
重金属污染具有环境毒性、丰富性和持久性，对河流生态系统具有巨大的生态风险。沉积物质量的检测和研究可以揭示水污染的变化、降解、循环和慢性效应。为了解1991-2006年深圳河沉积物中重金属的时空变化及其潜在生态风险，采集了表层（0-60 mm）河流沉积物样品，分析了重金属（Cr、Cd、Hg、As、Zn、Cu和Pb）含量。随着时间的推移，Cr呈明显上升趋势（P < 0.05），As和Cd均呈上升趋势，但无统计学意义（P = 0.10）。随着时间的推移，汞和锌略有增加的趋势，但铅和铜没有显示出趋势。沉积物中的风险指数（RI）为194.8 ~ 1417.6，表明其对水环境具有一定的生态风险或极高的生态风险。在7种重金属元素中，Cd和Hg是RI的主要贡献元素（83%）。沉积物中重金属的含量在空间尺度上也有显著的差异，工业化和城市化地区（布吉流域、福田流域和排洪流域）的含量较高。18个样地的RI值在540.2 ~ 2876.8之间，Cd是主要贡献重元素（55.1-99.1%）。2004年深圳河沉积物均表现出较强的生态风险或极高的生态风险。(C)2011 Elsevier Ltd和INQUA。All rights reserved.
Heavy metal contamination has great ecological risk for river ecosystems due to its environmental toxicity, abundance and persistence. The examination and study of sediment quality can reveal the pollutant variations, degradations, cycles and chronic effects of water pollution. In this study, surface (0-60 mm) river sediment samples were collected and heavy metals (Cr, Cd, Hg, As, Zn, Cu and Pb) were analyzed in order to understand the spatial and temporal variation of heavy metals and its potential ecological risk in the Shenzhen River during 1991-2006. Cr showed a significant increasing trend (P < 0.05), while both As and Cd increased but not with statistical significance (P = 0.10) over time. A slightly increasing trend was found for Hg and Zn, but Pb and Cu showed no trend over time. Risk index (RI) ranged from 194.8 to 1417.6 in sediment, indicating considerable ecological risk or very high ecological risk for the aquatic environment. Among the 7 heavy metals, Cd and Hg were the major contributing (83%) elements for RI. Concentrations of heavy metals in sediment also have significant variations on spatial scale, high in industrialized and urbanized areas (Buji catchment, Futian catchment and Paihong catchment). RI ranged from 540.2 to 2876.8 for the 18 plots, and Cd was the major contributing heavy element (55.1-99.1%). The sediments of Shenzhen River all showed considerable ecological risk or very high ecological risk in 2004. (C) 2011 Elsevier Ltd and INQUA. All rights reserved.