摘要
研究了徐州城市表层土壤的21个样品中30种元素的富集与分布特征。结果表明,与我国土壤元素的背景值(算术平均值)相比,表层土壤中Zn、Cd、As、Hg、Sb、Sn、Ag等元素富集大;Fe、Se、Sc、Ba、Bi、Pb、Cu、Ni、Cr、Mn、Mo、Be、Ti、Al、Ga、Li、Co等元素的富集较小。污染元素的空间分布特征显示了Zn、Cu、Pb、Cd等元素主要与交通运输等扩散污染源相关,而元素As、Sb的空间分布主要与工业污染源(点源)有关。环境风险指数的计算结果表明,表层土壤中重金属污染具有较大的环境风险,其中属于中等环境风险级别以上的样品占近40%,而且高风险区域主要集中在钢铁厂和化机厂等工业区范围内。
Twenty-one urban topsoils were sampled from the city of Xuzhou and concentrations of thirty elements （Zn, Cd, As, Hg, Sb, Sn, Ag, Fe, Se, Sc, Ba, Bi, Pb, Cu, Ni, Cr, Mn, Mo, Be, Ti, Al, Ga, Li, Co, etc.） were analyzed. Compared to the arithmetic means of natural soils of China, Zn, Cd, Hg, Sb, Sn, Ag, etc. have higher accumulation in the Xuzhou urban topsoils than that of the others （e.g. Fe, Se, Sc, Ba, Bi, Pb, Cu, Ni, Cr, Mn, Mo, Be, Ti, Al, Ga, Li, Co）. Spatial distributions of metals contaminated were constructed for the whole urban area pointing to vehicle traffic as the main source of diffuse pollution （ e.g. Pb, Cu, Zn, Cd） and also showing the contribution of point sources of pollution to urban surface soils. Environmental risk index also indicate higher risk as result of heavy metal pollution in urban surface soils. The frequency of samples that belong to or surpass the grade of medium environmental risk is almost 40% and the area that has high environmental risk is mainly confined to industrial zone （ e. g. iron-steel plant and chemical mechanical factory）.
出处
《中国环境监测》
CAS
CSCD
北大核心
2006年第1期70-76,共7页
Environmental Monitoring in China
关键词
城市表层土壤
富积
扩散污染源
重金属
环境风险
Urban topsoil
Accumulation
Source of diffuse pollution
Heavy metals
Environmental risk
