南京城市道路沉积物中重金属污染的来源分析
首发时间:2007-10-30
摘要:道路沉积物是一种重要的环境介质,其颗粒物积累的潜在毒性对于城市水体是一重要危害,因此,识别道路沉积物重金属的含量及来源就显得尤其重要。分析了采集于南京市工业区、交通区、商业区和住宅区的75个样品中的Pb、Cu、Cr、Zn和Cd 5种重金属,它们在交通区含量最大,Zn、Cu、Cr和Cd含量在商业区、工业区和住宅区有明显差异。通过主成分分析识别道路沉积物中重金属的来源,发现不同功能区的重金属来源有所差别。最后计算了重金属浓度富集率(CER),以评价人类活动对于重金属污染的影响程度。结果表明,有机质是南京城市道路沉积物中重金属的重要载体,人类活动对于该地区重金属污染影响达到中等或中等以上的程度。
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Analysis of Sources of Heavy Metal Contamination in Nanjing Road-Deposited Sediment
Abstract:Road-deposited sediments (RDS) were an important environmental medium which particulates accumulated potentially toxic pollutants,ultimately posing a threat to urban water-bodies,and therefore it was important to recognize sources and concentrations of heavy metal.75 samples from commercial areas, residential areas, intense traffic areas and riverside park respectively in Nanjing were analyzed for Pb、Cu、Cr、Zn and Cd. The results indicated remarkably high levels of five metals in the intense traffic area, whilst Zn,Cu,Cr and Ni show some discernible variations in other three areas. Principal component analysis was applied to identify the sources of heavy metal contamination. Finally, concentration enrichment ratio was used to assess degree of metal contamination affected by anthropogenic. The results showed that organic matter was the carrier of heavy metal in RDS and RDS in Nanjing had a moderate anthropogenic signals or excess moderate anthropogenic signals.
Keywords: road-deposited sediment (RDS);sources of heavy metal;concentration enrichment ratio(CER) ;Nanjing
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No.1602315839811937****
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