Temperature effect on migration of Zn and Cd through natural clay

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To investigate the effect of temperature on effective diffusion coefficients and retardation factors for Zn and Cd, combined diffusion and sequential extraction analyses were conducted at 15 degrees C and 55 degrees C. The effective diffusion coefficients of the metals increased up to ten times according to the increased temperature. On the other hand, the effect of temperature on the retardation factor depended on the retention mechanisms of the metals. The distribution coefficient for Zn, which was mainly partitioned in the carbonate phase, increased up to two times with the increase in temperature. On the other hand, the distribution coefficient for Cd, which was mainly partitioned in the exchangeable phase, was hardly affected by the temperature change. Results of combined diffusion and sequential extraction analysis showed that the effect of temperature on the heavy metals' (Zn and Cd) migration through the compacted natural clay was influenced by the combined effects of the diffusion coefficient and the retardation factor. Additionally, we could also observe the change in retention mechanism for the metals with the change in pore water concentration.
Publisher
SPRINGER
Issue Date
2006-07
Language
English
Article Type
Article
Keywords

HEAVY-METALS; SOILS; RETENTION; EXTRACTION; TRANSPORT; LINERS; LEAD

Citation

ENVIRONMENTAL MONITORING AND ASSESSMENT, v.118, pp.267 - 291

ISSN
0167-6369
DOI
10.1007/s10661-006-1501-y
URI
http://hdl.handle.net/10203/9760
Appears in Collection
CE-Journal Papers(저널논문)
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