宝鸡城市街尘、土壤及河流沉积物重金属形态迁移特征

在宝鸡城市街尘、土壤及河流沉积物基本理化性质和重金属元素含量分析的基础上,重点研究了重金属元素在街尘、土壤及河流沉积物中的赋存形态和迁移特征.结果表明:在街尘中Cu主要以可氧化态和残余态形式存在,Pb主要以可还原态和可氧化态形式存在,Zn和Cd主要以乙酸可提取态形式存在,Mn、Fe、Co、Ni和Cr主要以残余态形式存在...

Speciation and Transfer of Heavy Metals in Street Dust, Soil and River Sediment of Baoji City

The physical and chemical properties and contents of heavy metals in street dust, soil and fiver sediment of Baoji City were studied, and the spcciation and transfer of heavy metals were mainly studied. The results showed that in street dust, Cu was mainly dominated by the oxidizable and residual forms; Pb mainly existed in the reducible and oxidizable forms; Zn and Cd were rich in the acetic acid extractable forms; Mn, Fe, Co, Ni and Cr were mainly controlled by the residue. The heavy metal transfer in street dust was in the order of Cd Pb Zn Cu Mn Co Ni Cr Fe. In soil, Cu, Zn, Fe, Ni and Cr were mainly dominated by the residue; Pb and Mn mainly existed in the oxidizable and residual forms; Co was rich in the reducible and residual forms; Cd was mainly controlled by the acetic acid extractable, reducible and residual forms ; and the order of transfer of heavy metals was Pb Cd Co Mn Zn Cu Ni Cr Fe. In river sediment, Cu, Zn, Fe, Co, Ni and Cr were mainly dominated by the residue; Pb mainly existed in the reducible and residual forms; Mn and Cd were rich in the acetic acid extractable and residual forms; and the order of the transfer of heavy metals was Mn ≈ Pb Cd Co Cu Zn Ni Cr Fe. In the street dust, soil and river sediment of Baoji City, Cu,Pb, Mn,Co and Cd, which were easy to transfer and could be used by living creatures, had higher harm.