不同粒径降尘中痕量金属元素Cu、Pb、Zn、Cr的形态分析

Specification of Cu, Pb,Zn,Cr in Dust of Different Diameters

运用Ｔｅｓｓｌｅｒ形态分类法和石墨炉原子吸收分光光度法研究了不同粒径降尘样品中痕量金属元素Ｃｕ、Ｐｂ、Ｚｎ、Ｃｒ的存在形态，讨论了不同存在形态的分布规律。结果表明，Ｃｕ、Ｐｂ、Ｚｎ、Ｃｒ在降尘中的主要形态按顺序分别为有机结合态、铁锰氧化物结合态、铁锰氧化物结合态、残渣晶格态，其活性顺序为Ｚｎ＞Ｐｂ＞Ｃｕ＞Ｃｒ；４种元素的可交换态、碳酸盐结合态、铁锰氧化物结合态在小颗粒中的分布均比在大颗粒中占优势，说明小颗粒中金属元素较为活泼，其环境危害性更大。

Various Cu,Pb,Zn and Cr in dust of different diameters were studted using Tesslerscheme,and the distribution pattern was revealed.The results indicated that the dominant form ofCu,Pb,Zn and Cr was bound to organic matter, Fe-Mn oxides,Fe-Mn oxides and residual. Sotheir activity order was Zn > Pb > Cu > Cr,The exchangeable metals bound to carbonates and Fe-Mn oxides of four heavy metals in small particles were dominant compared with those in large particles. This demonstrates that heavy metals in small particles were more active and harmful.