Uranium Leaching from Contaminated Soil Utilizing Rhamnolipid, EDTA, and Citric Acid.
Uranium Leaching from Contaminated Soil Utilizing Rhamnolipid, EDTA, and Citric Acid.
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DOI：
10.1155/2014/462514
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发表时间：
2014-01-01
影响因子：
2.2
通讯作者：
Ingram, Jani C
中科院分区：
文献类型：
--
作者：
Asselin, Sara;Ingram, Jani C
近年来，生物表面活性剂作为一种“绿色”药剂，在土壤重金属和有机物污染修复中的应用越来越受到人们的关注。本文的总体目标是调查鼠李糖脂，微生物产生的生物表面活性剂，其能力，从废弃的矿山污染土壤中存在的铀浸出。土壤样品采集自亚利桑那州北方的两个地点：卡梅隆（露天采矿地点）和Leupp（控制-非采矿）。所采取的方法是，首先确定总铀含量在每一个土壤中使用氢氟酸消化，然后比较的量的金属去除鼠李糖脂的其他螯合剂EDTA和柠檬酸，最后确定可溶性金属的量在土壤基质中使用连续提取。结果表明，利用鼠李糖脂从土壤中去除金属的复杂系统。已确定浓度为150 μ M的鼠李糖脂对于去除可溶性铀与EDTA一样有效，但不如柠檬酸有效。然而，与纯净水对照相比，鼠李糖脂在从采矿土壤中去除铀方面仅略好。总体而言，这项研究表明，鼠李糖脂从受污染土壤中去除铀的能力与EDTA相当，在较小程度上与柠檬酸相当，但对于所研究的土壤，它并不比简单的水洗明显更好。
Biosurfactants have recently gained attention as "green" agents that can be used to enhance the remediation of heavy metals and some organic matter in contaminated soils. The overall objective of this paper was to investigate rhamnolipid, a microbial produced biosurfactant, and its ability to leach uranium present in contaminated soil from an abandoned mine site. Soil samples were collected from two locations in northern Arizona: Cameron (site of open pit mining) and Leupp (control-no mining). The approach taken was to first determine the total uranium content in each soil using a hydrofluoric acid digestion, then comparing the amount of metal removed by rhamnolipid to other chelating agents EDTA and citric acid, and finally determining the amount of soluble metal in the soil matrix using a sequential extraction. Results suggested a complex system for metal removal from soil utilizing rhamnolipid. It was determined that rhamnolipid at a concentration of 150 muM was as effective as EDTA but not as effective as citric acid for the removal of soluble uranium. However, the rhamnolipid was only slightly better at removing uranium from the mining soil compared to a purified water control. Overall, this study demonstrated that rhamnolipid ability to remove uranium from contaminated soil is comparable to EDTA and to a lesser extent citric acid, but, for the soils investigated, it is not significantly better than a simple water wash.