[Soil pollution of Cu, Zn, Pb and Cd in different city zones of Nanjing].
[Soil pollution of Cu, Zn, Pb and Cd in different city zones of Nanjing].
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发表时间：
2003-05
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通讯作者：
Xinmin Wu;Lianqing Li;G. Pan;Yufen Ju;Haiyang Jiang
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作者：
Xinmin Wu;Lianqing Li;G. Pan;Yufen Ju;Haiyang Jiang
将南京市划分为冶炼工业区、内商业区、内住宅区、新开发区、城市绿地区和保留风景区六个区。在每个区域内，采用三次亚采样技术随机采集土壤样品。按标准方法分别用硝酸、氯酸、硫酸混合溶液和顺序萃取剂消解土壤样品56个。用原子吸收光谱法测定了水体中总重金属和部分重金属。冶炼厂、商业小区、住宅小区、新建小区、城市绿地和风景名胜区土壤中铅、铜、锌、镉的平均含量分别为117.1+/-103.7 mg·kg-1、39.86+/-39.9 mg·kg-1、273.3+/-131.6 mg·kg-1和1.13+/-0.7 mg·kg-1，总污染指数分别为5.4、4.9、3.4、1.6、2.4和2.3。冶炼工业区铅、镉浓度高，化学迁移率低；市中心铅锌浓度高，无弹性酸可萃取池较大。除新开发区和保留区的土壤外，城市土壤中的重金属在深度分布上都或多或少是浅层的。城市地区严重的土壤铅和镉污染可能会对儿童的健康造成任何风险，他们的活动被认为发生在相对有限的区域。今后对城市土壤污染的研究应追求土壤污染对城市人类环境的影响。
The Nanjing city was divided into six zones as smelter industry, inner commercial, inner residence, newly developed, urban greenland and preserved scenic. In each zone, soil samples were randomly collected by triple subsampling technique. Total 56 soil samples were digested by mixed solution of nitric, chloridic and sulphatic acids and by sequential extractants respectively according to the standard methods. The total and fractional heavy metals were determined by AAS. The mean total content of Pb, Cu, Zn and Cd of the soils from smelter industry, inner commercial, inner residence, newly developed, urban greenland and preserved scenic zone was 117.1 +/- 103.7 mg.kg-1, 39.86 +/- 39.9 mg.kg-1, 273.3 +/- 131.6 mg.kg-1 and 1.13 +/- 0.7 mg.kg-1, with the overall pollution index being 5.4, 4.9, 3.4, 1.6, 2.4 and 2.3 respectively. The pollution in the smelter industrial zone was characterized by high concentration but low chemical mobility of Pb and Cd, while that in inner cities by high concentration of lead and zinc with quite larger acelatic acid extractable pool. Except for the soils from newly developed and preserved zones, the heavy metals were more or less superficial in respect to their depth distribution in the urban soils. The dramatic soil pollution of Pb and Cd in the urban area might cause any health risks for children, whose activities are believed to happen in a relative limited area. The future research on urban soil pollution should pursue the effect of soil pollution on human environment in the urban area.