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| Aging characteristics of Cd and Ni in soil based on DGT technology |
| Received:February 25, 2019 |
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| KeyWord:aging;DGT;cadmium;nickel;soil |
| Author Name | Affiliation | E-mail | | ZHANG Fan | College of Presources and Environment, Jilin Agricultural University, Changchun 130118, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHAO Yu-jie | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | yujiezhao@126.com | | MA Xiu-lan | College of Presources and Environment, Jilin Agricultural University, Changchun 130118, China | 491277643@qq.com | | ZHOU Qi-wen | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | zhouqiwen@cae.org.cn | | LIU Xiao-wei | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Tie-liang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | GUO Xin-lei | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Zuguang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | SONG Zhi-ting | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Ji-jun | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| The bioavailability of heavy metals entering the soil gradually decrease with aging time, and their toxicities are weakened. This process is greatly affected by the physical and chemical properties of the soil and the types and concentrations of the heavy metal. To study the aging process of exogenous heavy metals in the soil and analyze the influences of soil properties on the aging process, it is critical to assess the pollution risk of heavy metals. In the present study, the diffusive gradients in thin-films(DGT) technique was employed to investigate the aging characteristics of Cd and Ni in six types of soils. The aging process was fitted by a three-parameter isotope dilution equation, and the main factors were clarified by the Lasso model and the DPS method. The results showed that the aging process of Cd and Ni in different soils had significant differences, and the bioavailability of Ni decreased faster than that of Cd. The aging process of Cd and Ni could be divided into three stages generally. The period of rapid aging lasted about 20 to 30 days; the period of slow aging lasted about 30 to 60 days; and the final stage, the balance period lasted about 60 days, these features were true in all soil types except in some highly polluted soil. The equilibrium concentrations of Cd and Ni in the six soils were determined based on the initial total concentrations before the aging process. Another factor affecting the aging rate of Cd and Ni was the cation exchangeable capacities(CEC). DGT, as a non-destructive insitu technique, could represent dynamic changes in the bioavailable heavy metals during the aging process of exogenous heavy metal entering the soil. |
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