Sarkar Dibyendu, Makris Konstantinos C, Vandanapu Vandana, Datta Rupali
Department of Earth and Environmental Science, University of Texas at San Antonio, 6900 North Loop 1604 West, San Antonio, TX 78249-0663, USA.
Environ Pollut. 2007 Mar;146(2):414-9. doi: 10.1016/j.envpol.2006.06.035. Epub 2006 Aug 30.
Use of Fe/Al hydroxide-containing materials to remediate As-contaminated sites is based on the general notion that As adsorption in soils is primarily controlled by Fe/Al (hydr)oxides. A low-cost and potentially effective substitute for natural Fe/Al hydroxides could be the drinking-water treatment residuals (WTRs). Earlier work in our laboratory has shown that WTRs are effective sorbents for As in water. We hypothesized that land-applied WTRs would work equally well for As-contaminated soils. Results showed that WTRs significantly (p<0.001) increased the soil As sorption capacity. All WTR loads (2.5, 5, and 10%) significantly (p<0.001) increased the overall amount of As sorbed by both soils when compared with that of the unamended controls. The amount of As desorbed with phosphate (7500 mg kg(-1) load) was approximately 50%. The WTR effectiveness in increasing soil As sorption capacities was unaffected by differences in both soils' chemical properties.
使用含铁/铝氢氧化物的材料修复受砷污染的场地，其依据的一般概念是，土壤中砷的吸附主要受铁/铝（氢）氧化物控制。饮用水处理残余物（WTRs）可能是天然铁/铝氢氧化物的一种低成本且潜在有效的替代品。我们实验室早期的工作表明，WTRs是水中砷的有效吸附剂。我们推测，在土地上施用WTRs对受砷污染的土壤同样有效。结果表明，WTRs显著（p<0.001）提高了土壤对砷的吸附能力。与未改良的对照相比，所有WTR施用量（2.5%、5%和10%）均显著（p<0.001）增加了两种土壤吸附的砷总量。用磷酸盐（7500 mg kg(-1)施用量）解吸的砷量约为50%。WTRs提高土壤对砷吸附能力的有效性不受两种土壤化学性质差异的影响。
