Desorption Kinetics of Lead from Goethite: Effect of Mixing and Sorption Period
In natural systems, the solution concentration and hence, potential bioavailability of trace metals is primarily controlled by adsorption-desorption reactions at the mineral-water interface. While many studies have been conducted to understand the adsorption of trace metals to soil minerals, less i...
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ndltd-VTETD-oai-vtechworks.lib.vt.edu-10919-412402020-10-23T06:30:01Z Desorption Kinetics of Lead from Goethite: Effect of Mixing and Sorption Period Garman, Stephanie Michelle Crop and Soil Environmental Sciences Eick, Matthew J. Zelazny, Lucian W. Daniels, W. Lee Miscible Displacement Desorption Lead In natural systems, the solution concentration and hence, potential bioavailability of trace metals is primarily controlled by adsorption-desorption reactions at the mineral-water interface. While many studies have been conducted to understand the adsorption of trace metals to soil minerals, less is known about long-term adsorption/desorption processes. In this study, we examined the influence of mixing and sorption period on the desorption of lead from goethite. Lead sorption was rapid and essentially complete in 1 h, with no change in the quantity of lead adsorbed over the 6 month sorption period. Desorption of lead was slower than the adsorption reaction and was best modeled by two first order equations. At all sorption densities, the desorption of lead followed the order Short-term (24 h) > Long-term non-stirred (6 months) > Long-term stirred (6 months). However, statistical analysis indicated that these differences were not statistically significant. Furthermore, the desorption rate coefficients were very similar for all the experiments indicating that there was no significant residence time effect in this study. However, a sample from a previous study that was allowed to age 5 years and then analyzed by the desorption procedure did have statistically significant differences between the long-term (5 years) and the short-term (5 months). These results suggest that longer adsorption periods, perhaps a number of years, may be necessary to determine if residence time effects are an artifact of the experimental conditions or truly the length of the adsorption period. Master of Science 2014-03-14T21:30:04Z 2014-03-14T21:30:04Z 2006-02-10 2006-02-23 2008-03-10 2006-03-10 Thesis etd-02232006-113157 http://hdl.handle.net/10919/41240 http://scholar.lib.vt.edu/theses/available/etd-02232006-113157/ ThesisS.Garman.pdf TableofContents.pdf In Copyright http://rightsstatements.org/vocab/InC/1.0/ application/pdf application/pdf Virginia Tech |
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Miscible Displacement Desorption Lead |
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Miscible Displacement Desorption Lead Garman, Stephanie Michelle Desorption Kinetics of Lead from Goethite: Effect of Mixing and Sorption Period |
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In natural systems, the solution concentration and hence, potential bioavailability of trace metals is primarily controlled by adsorption-desorption reactions at the mineral-water interface. While many studies have been conducted to understand the adsorption of trace metals to soil minerals, less is known about long-term adsorption/desorption processes. In this study, we examined the influence of mixing and sorption period on the desorption of lead from goethite. Lead sorption was rapid and essentially complete in 1 h, with no change in the quantity of lead adsorbed over the 6 month sorption period. Desorption of lead was slower than the adsorption reaction and was best modeled by two first order equations. At all sorption densities, the desorption of lead followed the order Short-term (24 h) > Long-term non-stirred (6 months) > Long-term stirred (6 months). However, statistical analysis indicated that these differences were not statistically significant. Furthermore, the desorption rate coefficients were very similar for all the experiments indicating that there was no significant residence time effect in this study. However, a sample from a previous study that was allowed to age 5 years and then analyzed by the desorption procedure did have statistically significant differences between the long-term (5 years) and the short-term (5 months). These results suggest that longer adsorption periods, perhaps a number of years, may be necessary to determine if residence time effects are an artifact of the experimental conditions or truly the length of the adsorption period. === Master of Science |
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Crop and Soil Environmental Sciences |
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Crop and Soil Environmental Sciences Garman, Stephanie Michelle |
author |
Garman, Stephanie Michelle |
author_sort |
Garman, Stephanie Michelle |
title |
Desorption Kinetics of Lead from Goethite: Effect of Mixing and Sorption Period |
title_short |
Desorption Kinetics of Lead from Goethite: Effect of Mixing and Sorption Period |
title_full |
Desorption Kinetics of Lead from Goethite: Effect of Mixing and Sorption Period |
title_fullStr |
Desorption Kinetics of Lead from Goethite: Effect of Mixing and Sorption Period |
title_full_unstemmed |
Desorption Kinetics of Lead from Goethite: Effect of Mixing and Sorption Period |
title_sort |
desorption kinetics of lead from goethite: effect of mixing and sorption period |
publisher |
Virginia Tech |
publishDate |
2014 |
url |
http://hdl.handle.net/10919/41240 http://scholar.lib.vt.edu/theses/available/etd-02232006-113157/ |
work_keys_str_mv |
AT garmanstephaniemichelle desorptionkineticsofleadfromgoethiteeffectofmixingandsorptionperiod |
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1719353209879789568 |