摘要
选取沸石、硅藻土、海泡石、膨润土和石灰石等5种矿物材料,以6 g.kg-1的浓度分别添加到50 g供试土壤中,熟化两周后进行毒性浸出实验,研究各固化剂对土壤重金属的固化效果.实验表明石灰石对土壤重金属均有较好的固化作用,因此再将前4种固化剂与石灰石以不同质量比组配,并以同样方法研究各组配对土壤中重金属的固化效果,以期得到固化效果优于单一固化剂的组配固化剂.结果表明,几种组配中效果最好的是硅藻土与石灰石以质量比1∶2的组配,土壤浸提液中Pb、Cd、Cu、Zn浸出量较对照分别降低54.3%、100%、27.2%、63.8%.显然,1∶2的硅藻土+石灰石对土壤Pb、Cd、Zn均有较好的固化作用.
Zeolite,diatomite,sepiolite,bentonite,and/or limestone was added to 50 g tested soil,respectively,at a concentration of 6 g · kg-1.After two weeks of cultivation,the soils were tested to study the effects of these mineral materials on the immobilization of heavy metals in the soil through extraction procedure for leaching toxicity tests（TCLP）.Limestone was found to be effective in immobilizing the heavy metals,and it was mixed with one of the other four materials at different mass ratios to make group matching curing agents（GMCAs）.The same TCLP procedures were conducted to study the effects of the prepared GMCAs with addition of 6 g · kg-1 on the immobilization of heavy metals in order to achieve better immobilization effects than the single mineral materials.The experimental results indicated that among various GMCAs,the GMCA with a mass ratio of 1 ∶2 for diatomite and limestone was the best,and the treatment of this GMCA decreased contents of Pb,Cd,Cu,and Zn in soil leaching solutions by 54.3%,100%,27.2%,63.8%,respectively.Obviously,diatomite mixing with limestone at a mass ratio of 1 ∶2 was an agent which could immobilize soil heavy metals effectively,especially for Pb,Cd,and Zn.
出处
《环境化学》
CAS
CSCD
北大核心
2012年第9期1368-1374,共7页
Environmental Chemistry
基金
国家环保部公益性项目(201009047)
国家科技重大专项"水体污染控制与治理"(2008ZX07212-001-05)
湖南省重点学科建设项目(2006180)资助
关键词
土壤
重金属
组配固化剂
soil
heavy metal
group matching curing agents（GMCAs）
