研究论文
王美青,章明奎.杭州市城郊土壤重金属含量和形态的研究[J].环境科学学报,2002,22(5):603-608
杭州市城郊土壤重金属含量和形态的研究
- Concentrations and chemical associations of heavy metals in urban and suburban soils of the Hangzhou City, Zhejiang Province
- 基金项目：国家自然科学基金资助(编号49601013)
- 作者
- 单位
- 王美青
- 浙江大学环境与资源学院资源科学系,杭州 310029
- 章明奎
- 浙江大学环境与资源学院资源科学系,杭州 310029
- 摘要：研究了杭州市城郊文教居民区、风景旅游区、市郊农业区、市内商业区和市郊工业区等 5种土地利用背景下的 32个土样中 8个重金属元素 (Cd、Co、Cr、Cu、Ni、Pb、Zn、Mn)的含量和形态.结果表明,杭州市城郊土壤已受重金属的明显污染,其中以Pb的污染最为严重.污染程度为:市郊工业区 >市内商业区 >风景旅游区 >文教居民区 >市郊农业区.用连续提取方法对重金属分级表明,Cd、Co、Cr和Ni主要以残余态为主,平均占总量的 60 %以上,而Cu、Pb、Zn和Mn主要以酸可提取态、氧化物结合态和有机结合态存在,有较大的释放潜力和生物有效性.
- Abstract：Thirty two urban and suburban soils and two background (control) soils were sampled from the Hangzhou City for the study of an optimized European Community Bureau of Reference three step sequential extraction procedure was applied to heavy metal fractionation of the soils. Four operationally defined fractions were identified: acid extractable, reducible, oxidizable and residual. Data indicated that the urban and suburban soil in the Hangzhou City were anthropogenically contaminated by heavy metals to a great extent. Lead was the metals most enhanced with about 65 times as the concentration in the background soil. The degree of heavy metal contamination was in the order: suburban industrial zone>urban commercial zone>tourist zone>residential and education zone>suburban agricultural zone. More than 60% of Cd, Co, Cr and Ni was associated with residual fraction, Cu was dominantly associated with oxidizable fraction followed by reducible fraction. Pb was primarily associated with the reducible fraction with a mean of 65%, Zn and Mn had only one third of their total concentrations in the residual fraction, but one third in the reducible and one fifth in the acid extractable.
摘要点击次数： 1996 全文下载次数： 4336
