Journal
INTERNATIONAL JOURNAL OF ENVIRONMENT AND POLLUTION
Volume 49, Issue 1-2, Pages 89-99Publisher
INDERSCIENCE ENTERPRISES LTD
DOI: 10.1504/IJEP.2012.049770
Keywords
cadmium; adsorption-desorption; freeze-thaw cycles; brown soil
Categories
Funding
- National Basic Research Program (973) of China [2004CB418504]
- Doctor Science Research Foundation of Liaoning Province, China [20101094]
- Young scholars Foundation of Shenyang Agricultural University, China
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Adsorption-desorption characteristics of cadmium by brown soil, a typical soil in north-eastern China, were studied under different freeze-thaw cycles by using equilibrium adsorption isotherms. Freeze-thaw cycles were represented by temperatures of -30 degrees C and 30 degrees C, respectively. Both freezing and thawing conditions were implemented for three days each and the number of freeze-thaw cycles examined was zero, one, three and six. The results showed that the amount of adsorbed cadmium for one, three and six freeze-thaw cycles was 84, 74 and 70%, respectively, compared to soil experiencing no freeze-thaw cycles. About 33.1-50.0% of adsorbed Cd was desorbed from the soil without freeze-thaw cycles, while 32.1-73.0% of adsorbed Cd was desorbed from the freeze-thaw soil at the same initial concentration of Cd; the more the frequency of freeze-thaw, the higher the Cd desorbed.
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