Boparai H K, Comfort S D, Shea P J, Szecsody J E
School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE 68583, USA.
Chemosphere. 2008 Mar;71(5):933-41. doi: 10.1016/j.chemosphere.2007.11.001. Epub 2007 Dec 20.
In situ chemical reduction of clays and iron oxides in subsurface environments is an emerging technology for treatment of contaminated groundwater. Our objective was to determine the efficacy of dithionite-reduced sediments from the perched Pantex Aquifer (Amarillo, TX) to abiotically degrade the explosives RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine), and TNT (2,4,6-trinitrotoluene). The effects of dithionite/buffer concentrations, sediments-solution ratios, and the contribution of Fe(II) were evaluated in batch experiments. Results showed that reduced Pantex sediments were highly effective in degrading all three high explosives. Degradation rates increased with increasing dithionite/buffer concentrations and soil to solution ratios (1:80-1:10 w/v). When Fe(II) was partially removed from the reduced sediments by washing (citrate-bicarbonate buffer), RDX degradation slowed, but degradation efficiency could be restored by adding Fe(II) back to the treated sediments and maintaining an alkaline pH. These data support in situ redox manipulation as a remedial option for treating explosive-contaminated groundwater at the Pantex site.
在地下环境中对黏土和氧化铁进行原位化学还原是一种新兴的受污染地下水处理技术。我们的目标是确定来自潘泰克斯高位含水层（德克萨斯州阿马里洛）经连二亚硫酸盐还原的沉积物对爆炸物RDX（六氢-1,3,5-三硝基-1,3,5-三嗪）、HMX（八氢-1,3,5,7-四硝基-1,3,5,7-四氮杂环辛烷）和TNT（2,4,6-三硝基甲苯）进行非生物降解的效果。在批次实验中评估了连二亚硫酸盐/缓冲液浓度、沉积物-溶液比例以及Fe(II)的贡献。结果表明，还原后的潘泰克斯沉积物对所有三种高爆炸药都有很高的降解效果。降解速率随着连二亚硫酸盐/缓冲液浓度和土壤与溶液比例（1:80 - 1:10 w/v）的增加而提高。当通过洗涤（柠檬酸盐-碳酸氢盐缓冲液）从还原后的沉积物中部分去除Fe(II)时，RDX降解减缓，但通过向处理后的沉积物中重新添加Fe(II)并保持碱性pH值，降解效率可以恢复。这些数据支持原位氧化还原操作作为潘泰克斯场地处理受爆炸物污染地下水的一种修复选择。
Zotero 插件