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- W1999989928 abstract "We present results on the migration of silica colloids through laboratory columns packed with partially saturated quartz sand. The transport of the silica colloids responds to changes in the steady-state volumetric moisture content (ϑ) and for low ϑ depends on the wetting history of the sand pack prior to colloid injection. A mathematical model that incorporates a first-order rate law to simulate film straining and a second-order rate law to simulate partitioning at air−water interfaces closely describes colloid transport and mass transfer over the range of experimental conditions tested. The mass-transfer parameters of the model are sensitive to changes in both the level of water saturation and the flow rate. A semiempirical expression, based on a modification of film-straining theory, accounts for the observed variation in the first-order rate coefficient with changes in ϑ and average porewater velocity. Our work indicates that the presence of the air phase substantially influences porewater concentrations of mineral colloids in water-unsaturated media and that the kinetics of particle removal attributed to air−water boundaries reflects the contribution of multiple mass-transfer mechanisms." @default.
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- W1999989928 date "2002-01-08" @default.
- W1999989928 modified "2023-10-15" @default.
- W1999989928 title "Transport of Silica Colloids through Unsaturated Porous Media: Experimental Results and Model Comparisons" @default.
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- W1999989928 doi "https://doi.org/10.1021/es0109949" @default.
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