摘要
本文用Tessler方法,研究了模拟酸雨条件下,降尘中Cu,Pb,Zn,Cr各形态的溶出和相互转化.试验表明:(1)降尘中Cu,Cr的溶出量随酸雨酸度的增大而增加;Pb,Zn则分别在pH=3.5和pH=4.5时溶出量最大,溶出的金属多源于可交换态和碳酸盐结合态,说明这两种形态的稳定性较差.(2)在模拟酸雨条件下,Cu,Pb,Zn,Cr各形态的含量发生了较大变化;Cu从其优势形态有机结合态向可交换态、碳酸盐结合态、铁锰氧化物结合态转化;Pb,Zn,Cr则由铁锰氧化物结合态向可交换态和碳酸盐结合态转化.
The effect of acid rain on species of Cu, Pb, Zn, Cr has been studied by Tessler method. In simulant acid rain the content of Cu, Cr increased with decreasing pH, whereas solubilization content of Pb, Zn has a peak value at pH 3. 5 and 4. 5, respectively, which come from the exchangeable and carbonate-bound fractions in the first place. In addition, the contents of various species of Cu, Pb, Zn, Cr are changed greatly in simulant acid rain. Copper transforms from Superior form (bound to organic matter) to exchangeable, then bound to carbonates and finally to Fe-Mn oxides; while lead, zinc and chromium transform from Fe-Mn oxides to exchangeable and to carbonates.
出处
《环境化学》
CAS
CSCD
北大核心
1994年第5期448-452,共5页
Environmental Chemistry
关键词
模拟酸雨
形态分析
铜
铅
锌
铬
降尘
simulant acid rain, speciation, copper, lead, zinc, chromium, dust.
