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| Stabilization characteristics of cadmium in some typical agricultural soils |
| Received:August 10, 2016 |
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| KeyWord:cadmium;stabilization;availability;dynamic equations |
| Author Name | Affiliation | E-mail | | LI Chuan-fei | College of Resource Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | LI Ting-xuan | College of Resource Sciences, Sichuan Agricultural University, Chengdu 611130, China | litinx@263.net | | ZHANG Xi-zhou | College of Resource Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | YU Hai-ying | College of Resource Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Lu | College of Resource Sciences, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| A incubation experiment in laboratory was conducted to study the stabilization processes of cadmium(Cd) in five typical agricultural soils, including paddy soil, yellow soil, acid purplish soil, neutral purplish soil and calcareous purplish soil, which were obtained in Sichuan Province. The changes of available Cd with the increasing incubation time to 180 days was determined, and simulated by dynamic equations. Correlation analysis was also made to investigate the effects of soil properties on the stabilization process of Cd in soils. The results showed that the available Cd decreased rapidly during the first 15 days, then slowly decreased. Little change was observed for the available Cd with increasing time to 30 days, when soil Cd concentration was not more than 2 mg·kg-1, and with increasing time to 60 days when soil Cd concentration was not less than 5 mg·kg-1. Finally, the available Cd concentration in paddy soil, yellow soil and acid purplish soil accounted 52.6%~66.7% of the total Cd in soil. For the neutral purplish soil and calcareous purplish soil, the available Cd accounted 33.6%~46.5% of the total Cd in soil. Besides, the stabilization process of Cd in soils could be well described by the second-order equation among five dynamic equations. The dynamic parameters, including equilibrium content and stabilization velocity, could be used to describe the stabilization process of Cd in soils. Furthermore, correlation analysis indicated that the stabilization process of Cd in soils was closely related to soil properties. Lower available Cd was observed in soils with higher pH, CEC and OM content. Higher pH, CEC and OM in soils had significant inhibition effect on the Cd content in soils. In especial, the pH of soils presented the greatest effect on the equilibrium content and stabilization velocity of Cd. |
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