Journal article
Colloid-facilitated Cs transport through water-saturated Hanford sediment and Ottawa sand
Environmental science & technology, Vol.37(21), pp.4905-4911
11/01/2003
Handle:
https://hdl.handle.net/2376/104199
PMID: 14620817
Abstract
In this study, a series of saturated column experiments were conducted to investigate effects of colloids on Cs transport in two types of porous media (Hanford sediment characteristic of 2:1 clay minerals and silica Ottawa sand). The colloids used were obtained by reacting Hanford sediment with simulated tank waste solutions. Because of the highly nonlinear nature of Cs sorption found in batch experiments, we used two different concentrations of Cs (7.5 x 10(-5) M and 1.4 x 10(-8) M) for the transport experiments. The presence of colloids facilitated the transport of Cs through both Hanford sediment and Ottawa sand via association of Cs with mobile colloidal particles. Due to the nonlinearity of the Cs sorption, the colloid-facilitated Cs transportwas more pronounced atthe low Cs concentration (1.4 x 10(-8) M) than at the high concentration (7.5 x 10(-5) M) when expressed relative to the inflow Cs concentration. In the absence of colloids, no Cs moved through the 10-cm long columns during the experiment within about 20 pore volumes, exceptfor the high Cs concentration in the Ottawa sand where a complete Cs breakthrough was obtained. Also, it was found that colloid-associated Cs could be partially stripped off from colloids during the transport. The stripping effect was controlled by both Cs concentration and sorption capacity of the transport matrix.
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Details
- Title
- Colloid-facilitated Cs transport through water-saturated Hanford sediment and Ottawa sand
- Creators
- Jie Zhuang - Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware 19717, USAMarkus FluryYan Jin
- Publication Details
- Environmental science & technology, Vol.37(21), pp.4905-4911
- Academic Unit
- Crop and Soil Sciences, Department of
- Publisher
- United States
- Identifiers
- 99900546716601842
- Language
- English
- Resource Type
- Journal article