Zhu Wei, Bian Bo, Ruan Ai-dong
College of Environmental Science and Engineering, Hohai University, Nanjing 210098, China.
Huan Jing Ke Xue. 2007 Jul;28(7):1584-9.
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. 62 samples from commercial areas, residential areas, intense traffic areas and riverside park respectively in Zhenjiang were analyzed for Zn, Pb, Cu, Cr and Ni. The results indicated remarkably high levels of five metals in the intense traffic area, whilst Zn, Cu, Cr and Ni did not show any discernible variations in other three areas. Principal component analysis was applied to identify the sources of heavy metal contamination. The first factor (source) spanning the greater amount of variance (70%) should be vehicular source or source of mixed origin including industrial and vehicular, and the second factor should be industrial or life sources. The metals are strongly correlated to the amount of organic matter. 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 Zhenjiang had a moderate anthropogenic signals or excess moderate anthropogenic signals.
道路沉积物（RDS）是一种重要的环境介质，颗粒物在其中积累潜在有毒污染物，最终对城市水体构成威胁，因此识别重金属的来源和浓度很重要。分别对镇江商业区、居民区、交通繁忙区和滨江公园的62个样本进行了锌、铅、铜、铬和镍的分析。结果表明，交通繁忙区的五种金属含量显著较高，而在其他三个区域，锌、铜、铬和镍没有明显变化。应用主成分分析来识别重金属污染的来源。解释了大部分方差（70%）的第一个因子（来源）应为车辆源或包括工业和车辆源的混合源，第二个因子应为工业源或生活源。这些金属与有机物含量密切相关。最后，使用浓度富集比来评估人为因素对金属污染的影响程度。结果表明，有机物是道路沉积物中重金属的载体，镇江的道路沉积物具有中等人为信号或中度人为信号超标。
