Comparison of three labeled silica nanoparticles used as tracers in transport experiments in porous media. Part II: Transport experiments and modeling
Comparison of three labeled silica nanoparticles used as tracers in transport experiments in porous media. Part II: Transport experiments and modeling
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DOI：
10.1016/j.envpol.2013.08.016
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发表时间：
2014-01-01
影响因子：
8.9
通讯作者：
Gaudet, Jean-Paul
中科院分区：
文献类型：
--
作者：
Vitorge, Elsa;Szenknect, Stephanie;Gaudet, Jean-Paul
三种类型的标记的二氧化硅纳米粒子在饱和砂土中的传输实验中使用。本研究的目的是评价在实际运输条件下标记技术（荧光（FITC）、金属（Ag（0）核）和放射性（Ag-110 m（0）核））的效率以及多孔介质中不同尺寸和浓度的二氧化硅纳米胶体的反应性运输。对比实验条件下获得的实验结果表明，在砂中的沉积是由纳米粒子的尺寸和溶液的离子强度控制。提出了一个定量描述胶体输运的数学模型。荧光标记被广泛用于研究胶体在土壤中的归宿，但灵敏度较低。发现用ICP-MS检测的Ag（0）标记对测量沉积分布非常敏感。放射性标记（Ag-110 m（0））纳米颗粒允许原位检测。用放射性标记的纳米颗粒获得的结果是完全原创的，可用于改善沉积和释放动力学的建模。(C)2013爱思唯尔有限公司保留所有权利。
Three types of labeled silica nanoparticles were used in transport experiments in saturated sand. The goal of this study was to evaluate both the efficiency of labeling techniques (fluorescence (FITC), metal (Ag(0) core) and radioactivity (Ag-110m(0) core)) in realistic transport conditions and the reactive transport of silica nanocolloids of variable size and concentration in porous media. Experimental results obtained under contrasted experimental conditions revealed that deposition in sand is controlled by nanoparticles size and ionic strength of the solution. A mathematical model is proposed to quantitatively describe colloid transport. Fluorescent labeling is widely used to study fate of colloids in soils but was the less sensitive one. Ag(0) labeling with ICP-MS detection was found to be very sensitive to measure deposition profiles. Radiolabeled (Ag-110m(0)) nanoparticles permitted in situ detection. Results obtained with radiolabeled nanoparticles are wholly original and might be used for improving the modeling of deposition and release dynamics. (C) 2013 Elsevier Ltd. All rights reserved.