Document Detail


Transport and interactions of kaolinite and mercury in saturated sand media.
MedLine Citation:
PMID:  22341489     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
To evaluate the potential of Hg release and co-transport by colloids, it is important to understand how Hg, colloids and Hg-loaded colloids migrate in soils. Hg sorption by kaolinite and sand were nonlinear and fit the Langmuir model, with the maximum Hg sorption capacity being 1.2mg/g kaolinite and 0.11mg/g sand. Co-transport of Hg and kaolinite was evaluated using: (1) 1 or 100mg/L Hg or 100mg/L kaolinite, (2) 1 or 100mg/L Hg mixed with 100mg/L kaolinite, (3) 1 or 100mg/L Hg presorbed onto kaolinite, and (4) 250mg/L kaolinite in Hg-loaded sand columns. The presence of kaolinite (100mg/L) reduced Hg's mobility through sand column by increasing deposition rate of Hg-loaded kaolinite. At 100mg/L Hg, soluble Hg dominated Hg transport; but at 1mg/L Hg, colloidal Hg (Hg sorbed on kaolinite) affected Hg transport. Preloading 100mg/L Hg onto kaolinite (0.43mg/g) reduced kaolinite's mobility with low recovery rate (78%), with Hg retardation (R=1) in Hg-loaded kaolinite being lower than Hg retardation at 100mg/L Hg (R=1.287). The Hg recovery rate (93%) from Hg-loaded kaolinite at 1mg/L Hg was higher compared to 22% from 1mg/L Hg. Kaolinite can serve as a carrier to enhance Hg transport in porous media, with 250mg/L kaolinite mobilizing ∼2.4% Hg presorbed onto sand media. Correlation analysis revealed that desorbed Hg was significantly correlated with kaolinite (r=0.81, P<0.0001). Hence kaolinite enhanced Hg transport in the sand media serving both as a carrier (Hg was loaded before transport) and as mobile colloids stripping Hg off the sand media (Hg was loaded during transport).
Authors:
Yingjia Zhu; Lena Q Ma; Bin Gao; J C Bonzongo; Willie Harris; Binhe Gu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-28
Journal Detail:
Title:  Journal of hazardous materials     Volume:  -     ISSN:  1873-3336     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-2-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Published by Elsevier B.V.
Affiliation:
Soil and Water Science Department, University of Florida, Gainesville, FL 32611, United States.
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