含铁材料对污染水稻土中砷的稳定化效果  

Stabilization effects of iron-containing materials on arsenic in contaminated paddy soils

作　　者：胡立琼[1] 曾敏[1] 雷鸣[2] 廖柏寒[1] 周航[3] 

机构地区：[1]中南林业科技大学林学院,长沙410004 [2]湖南农业大学资源与环境学院,长沙410128 [3]湖南农业大学生物科学技术学院,长沙410128

出　　处：《环境工程学报》2014年第4期1599-1604,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金青年科学基金资助项目(41201530;21007014);环保公益性行业科研专项(201009047);湖南省自然科学基金资助项目(12JJ5007);长沙市科技计划项目(K1109004-21)

摘　　要：通过化学实验方法,向砷污染水稻土中添加4种含铁材料(FeCl3、FeCl2、Fe0和Fe2O3),分析稳定后土壤中pH、砷形态及砷毒性浸出量的变化,研究4种含铁材料对污染水稻土中砷的稳定化效果。结果表明,FeCl3和FeCl2处理降低了土壤pH,Fe0和Fe2O3处理对土壤pH影响不大。4种含铁材料均明显降低了土壤中易溶态砷(WE-As)和毒性浸出砷含量。在最大添加量为8.00 g/kg时,FeCl3、FeCl2、Fe0和Fe2O3分别使易溶态砷比对照降低了86.4%、63.6%、77.3%和36.4%,使毒性浸出砷比对照降低了96.3%、88.9%、70.4%和30.4%。4种含铁材料均对水稻土壤中砷具有较好的稳定化效果,且能力大小依次为:FeCl3>FeCl2、Fe0>Fe2O3。Fe0和Fe2O3处理使WE-As、铝型砷(Al-As)、铁型砷(Fe-As)向钙型砷(Ca-As)和残渣态砷(RS-As)转化;FeCl3处理使土壤WE-As、Al-As向Fe-As、Ca-As和RS-As转化;FeCl2处理使土壤WE-As、Ca-As向Al-As、Fe-As转化,对RS-As影响不明显。说明Fe0固砷的机理与Fe2O3相似,与FeCl3有一定差异,与FeCl2的差异可能更大。A chemical experiment was conducted to investigate stabilization effects of four kinds of iron-con- taining materials （FeCl3 , FeCl2, Fe0 and Fe2O3 ） on arsenic （As） in contaminated paddy soils. The effects of four kinds of iron-containing materials on soil pH,As fractions and leachable As were analyzed in this study. Following findings are obtained：（ 1 ） FeCl3 and FeCl2 acidified the soil,whereas Fe0 and Fe2O3 had no obvious influence on the soil pH. （2） The contents of water-soluble and exchangeable As （WE-As） and leachable As were signifi- cantly decreased by these four materials. When the adding amount reached to the maximum level of 8. 00 g/kg, FeCl3 ,FeCl2 ,Fe0 and Fe2O3 decreased the contents of soil WE-As by 86.4% ,63.6% ,77.3% ,36.4% ,respec- tively,and decreased the contents of leachable As by 96.3% ,88.9% ,70.4% and 30.4% ,compared with the control. Therefore, all of the four iron-containing materials bad significant stabilization effects on As in paddy soil, and the capability was followed as the order FeCl3 〉 FeCl2 and Fe0 〉 Fe2O3. （3） Fe0 and Fe2O3 transformed WE-As,Al bound As （Al-As） and Fe bound As （Fe-As） into Ca bound As （Ca-As） ,residue As （RS-As）. FeCl3 transformed WE-As,Al-As into Fe-As, Ca-As and RS-As. However, FeCl2 transformed WE-As, Ca-As into Al-As, Fe-As and it had no obvious effect on RS-As in soils. Therefore,the mechanism of As stabilization by Fe0 may be similar to that of Fe2O3 ,but it may has certain difference with the FeCl3 and significant difference from the FeCl2.

关 键 词：含铁材料 砷污染 水稻土 稳定化 

分 类 号：X53[环境科学与工程—环境工程]