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| Effect of different colloids in irrigation water on the desorption and migration of heavy metals in Lou soil |
| Received:June 08, 2016 |
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| KeyWord:irrigation water, soil, heavy metals, desorption, migration |
| Author Name | Affiliation | E-mail | | XIE Bing-yi | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | JIANG Yan-ji | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | SUN Hui-min | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | huiminsun@126.com | | QUAN Min | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | HU Zhen | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | SHANG Hao-bo | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | |
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| Abstract: |
| A series of desorption and column leaching experiments were conducted with three types irrigation water(inorganic, organic and pure irrigation water). The experiment were designed to simulate colloidal suspensions of montmorillonite and humic acid, and distilled water, respectively. The contents of nickel(Ni), cadmium(Cd) and lead(Pb) in the soil were analyzed. The results showed that the desorption capacity of Cd was greater than that of Ni and Pb in three desorption irrigation water. The total desorption rate of Cd ranged from 16.34% to 26.51%. The inital desorption rates of Cd and Ni were higher than the second desorption rates, while Pb had the contrary trend. Within the three irrigation waters, the organic water has the strongest desorption capacity for Cd and Ni, while the inorganic irrigation water has the strongest capacity for Pb. The results of the soil column leaching experiment showed that Cd was the most, while Pb was the least mobile element in the soil among the three elements. The different irrigation waters had significant effect on the migration of Cd after 30 days leaching, on the migration of Ni after 45 days leaching, but had no effect on the migration of Pb during the experiment. |
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