铬污染土壤处理中的铬含量及形态变化  

Content and speciation changes of chromium in treatment of contaminated soil

作　　者：陈勇[1,2] 王清森[1,2] 张浩凡 

机构地区：[1]四川大学四川省环境保护土壤环境保护工程技术中心,四川成都610065 [2]四川大学川大-日立环境应用技术研究中心,四川成都610065

出　　处：《化工环保》2017年第3期335-339,共5页Environmental Protection of Chemical Industry

摘　　要：采用FeSO_4和Na_2S作为还原剂处理铬污染紫色土壤,研究了还原过程中铬的含量及形态的变化。实验结果表明:当FeSO_4加入量为1.5%(w,下同)时,浸出Cr(Ⅵ)含量由(1 745.13±27.93)mg/kg降至(17.65±2.28)mg/kg,浸出总铬含量由(1 768.83±57.24)mg/kg降至(69.79±8.61)mg/kg,铬形态由水溶+碳酸盐结合态转变到较稳定的铁锰结合态;当Na_2S加入量为0.4%时,浸出Cr(Ⅵ)含量由(1 745.13±27.93)mg/kg降至(25.50±0.12)mg/kg,浸出总铬含量由(1 768.83±57.24)mg/kg降至(410.87±12.83)mg/kg,铬形态由水溶+碳酸盐结合态转变到铁锰结合态和有机结合态。FeSO4 and Na2S were used as reducing agent to treat the chromium-contaminated purple soil. The content and speciation changes of chromium in the reduction process were studied. The experimental results showed that： When the amount of FeSO4 was 1.5% （w）, the content of leached Cr （VI） was decreased from （1 745.13 ±27.93） mg/ kg to （17.65 ± 2.28）mg/kg, the content of leached total chromium was decreased from （1 768.83 ± 57.24）mg/kg to （69.79±8.61 ） mg/kg, and chromium is changed from water soluble carbonate bound state to the stable Fe-Mn bound state; When the amount of Na2S was 1.5% （w）, the content of leached Cr （VI） was decreased from （1 745.13 ± 27.93） mg/kg to （25.50 ±0.12） mg/kg, the content of leached total chromium was decreased from （1 768.83 ± 57.24） mg/kg to （410.87 ±12.83 ） mg/kg, and chromium is changed from water soluble carbonate bound state to Fe-Mn bound state and organic bound state.

关 键 词：紫色土壤 铬污染 铬形态 水溶+碳酸盐结合态 铁锰结合态 有机结合态 

分 类 号：X53[环境科学与工程—环境工程]