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| Effect of freezing/thawing on transport of soil colloids and colloidal lead |
| Received:April 06, 2018 Revised:July 09, 2018 |
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| KeyWord:freezing/thawing;soil colloids;colloidal lead;soil pollutant transport |
| Author Name | Affiliation | E-mail | | WANG Zhan | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | | | ZOU Hong-tao | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | | | FAN Qing-feng | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | | | CEN Jia-rong | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | | | ZHANG Yu-long | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | ylzsau@163.com |
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| Abstract: |
| Transport characteristics of soil colloids and colloidal lead (Pb)in contaminated soil columns treated with different freeze/thawing cycles were investigated by simulating the temperature conditions in soil column leaching experiments. Brown soil samples were collected from the northeast of China. The results showed that freezing/thawing accelerated the transport of soil colloids under higher soil water contents (100% of field capacity)and decreased it under lower soil water contents (10% of field capacity). A considerable proportion of soil colloids leached out during the first 20 min in the column leaching experiment, after which time the leaching amount decreased sharply. Moreover, the amount of soil colloids leached during the first 20 min increased first and then decreased with the extension in freezing/thawing time. Pb present in the contaminated soil columns was transported mainly in the form of colloidal Pb and its transport characteristics were similar to those of soil colloids. Higher proportions of Pb were retained in deeper layers of the soil columns, indicating that freezing/thawing could facilitate Pb transport. |
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