Grain-Size Based Additivity Models for Scaling Multi-rate Uranyl Surface Complexation in Subsurface Sediments View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2015-09-28

AUTHORS

Xiaoying Zhang, Chongxuan Liu, Bill X. Hu, Qinhong Hu

ABSTRACT

The additivity model assumed that field-scale reaction properties in a sediment including surface area, reactive site concentration, and reaction rate can be predicted from field-scale grain-size distribution by linearly adding reaction properties estimated in laboratory for individual grain-size fractions. This study evaluated the additivity model in scaling mass transfer-limited, multi-rate uranyl (U(VI)) surface complexation reactions in a contaminated sediment. Experimental data of rate-limited U(VI) desorption in a stirred flow-cell reactor were used to estimate the statistical properties of the rate constants for individual grain-size fractions, which were then used to predict rate-limited U(VI) desorption in the composite sediment. The result indicated that the additivity model with respect to the rate of U(VI) desorption provided a good prediction of U(VI) desorption in the composite sediment. However, the rate constants were not directly scalable using the additivity model. An approximate additivity model for directly scaling rate constants was subsequently proposed and evaluated. The result found that the approximate model provided a good prediction of the experimental results within statistical uncertainty. This study also found that a gravel-size fraction (2 to 8 mm), which is often ignored in modeling U(VI) sorption and desorption, is statistically significant to the U(VI) desorption in the sediment. More... »

PAGES

511-535

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11004-015-9620-z

DOI

http://dx.doi.org/10.1007/s11004-015-9620-z

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1018652457


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