Phyto-accessibility of Mn, Cu, Zn, and Pb in Stabilized Artificial Soil Mixtures
In this study,phyto-accessibility (diethylenetriamine pentaacetic acid,DTPA,extraction) of heavy metals (Mn,Cu,Zn,and Pb) in artificial soil mixtures of sewage sludge with alkaline fly ash and slag was investigated in laboratory incubation.Phyto-accessibility of Mn,Cu,Zn,and Pb was obviously reduced by mixing sewage sludge with alkaline fly ash and slag and thus decreased the potential toxicity of metals in artificial soil mixtures.Mn,Cu and Zn phyto-accessibility increased generally with the decrease of percentage of fly ash in mixtures.Initial soil DTPA-extractable Mn,Cu,Zn,and Pb concentrations in artificial soils were 20.3-31.4,5.42-13.7,23.9-42.1,and 6.60-8.35 mg/L,respectively.During 63d incubation,soil DTPA-extractable Cu and Pb concentrations gradually decreased,but soil DTPA-extractable Mn concentrations increased quickly before the maximum,and then declined rapidly to a stable level,and soil DTPA-extractable Zn concentrations increased obviously and then reached a plateau.In the end of incubation,soil DTPA-extractable Mn,Cu,Zn,and Pb concentrations in artificial soils were 31.3-33.9,0.83-2.14,111-116,and 4.85-5.93 mg/L,respectively.These artificial soils could be used for ecological reconstruction in mining areas.
sewage sludge fly ash slag artificial soil mixtures phyto-accessibility
WANG Kaifeng PENG Na TU Changqing
College of Chemistry and Environmental Sciences, Jiaying University, Meizhou 514015, China
国际会议
合肥
英文
518-523
2012-05-24（万方平台首次上网日期，不代表论文的发表时间）