Li Xiangdong, Lee Siu-lan, Wong Sze-chung, Shi Wenzhong, Thornton Iain
Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Environ Pollut. 2004 May;129(1):113-24. doi: 10.1016/j.envpol.2003.09.030.
The study of regional variations and the anthropogenic contamination by metals of soils is very important for environmental planning and monitoring in urban areas. An extensive survey was conducted in the highly urbanized Kowloon area (46.9 km(2)) of Hong Kong, using a systematic sampling strategy with a sampling density of 3-5 composite soil samples (0-15 cm) per km(2). Geochemical maps of 'total' metals (Cd, Cr, Cu, Ni, Pb and Zn) from strong acid extraction in the surface soils were produced based on geographical information system (GIS) technology. A significant spatial relationship was found for Ni, Cu, Pb and Zn in the soils using a GIS-based analysis, suggesting that these metal contaminants in the soils of the Kowloon area had common sources. Several hot-spot areas of metal contamination were identified from the composite metal geochemical map, mainly in the old industrial and residential areas. A further GIS analysis revealed that road junctions, major roads and industrial buildings were possible sources of heavy metals in the urban soils. The Pb isotope composition of the contaminated soils showed clear anthropogenic origins.
研究土壤中金属的区域差异和人为污染对于城市地区的环境规划和监测非常重要。在香港高度城市化的九龙地区（46.9平方公里）进行了一项广泛的调查，采用系统抽样策略，每平方公里采样密度为3 - 5个复合土壤样本（0 - 15厘米）。基于地理信息系统（GIS）技术制作了表层土壤中强酸提取的“总”金属（镉、铬、铜、镍、铅和锌）的地球化学图。通过基于GIS的分析发现土壤中的镍、铜、铅和锌存在显著的空间关系，这表明九龙地区土壤中的这些金属污染物有共同来源。从复合金属地球化学图中识别出几个金属污染热点地区，主要位于旧工业区和居民区。进一步的GIS分析表明，道路交叉口、主要道路和工业建筑可能是城市土壤中重金属的来源。受污染土壤的铅同位素组成显示出明显的人为来源。
