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| Passivation and remediation of cadmium and arsenic pollution in soil using composite/modified materials |
| Received:October 27, 2021 |
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| KeyWord:cadmium;arsenic;compound material;modified biochar;modified eucalyptus sawdust |
| Author Name | Affiliation | E-mail | | YANG Jingmin | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LIANG Xinran | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | JIANG Na | College of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China | | | HUANG Zhihong | Shengqing Environmental Protection Co., Ltd, Kunming 650031, China | | | MOU Fengli | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZU Yanqun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | 649332092@qq.com | | LI Yuan | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | |
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| Abstract: |
| To explore the remediation effect and mechanism of three types of passivation materials on cadmium- and arsenic-polluted soil, pot experiments were conducted. The materials used were lime+ferrous sulfate(LF), modified biochar(MB), and modified eucalyptus chips (MC). The effect of ryegrass on cadmium and arsenic accumulation was also evaluated. Results showed that the application of LF with soil weight ratio of 0.5%, 1%, and 2% and MB and MC with soil weight ratio of 0.25%, 0.5%, and 1% did not cause great fluctuation in soil pH value in a heavily polluted soil with soil pH of 8.19 and Cd and As contents of 6.87 mg·kg-1 and 67.59 mg·kg-1, respectively. The passivation efficiencies of LF, MB, and MC for Cd and As were 21.4%~32.9%, 25.2%~29.4%, 18.4%~24.9%, and 3.5%~24.5%, 3.7%~22.1%, and 11.8%~18.2%, respectively. The three materials transformed Cd and As to a low active state through electrostatic attraction, complexation, and precipitation. The three materials had no significant effect on the biomass of ryegrass, but reduced Cd content by 6.5%~25.4%, 43.9%~48.8%, and 40.5%~48.3% in the shoots of ryegrass and As content by 33.1%~43.7%, 33.6%~38.9%, and 14.9%~44.4%, respectively. The three materials effectively inhibited and controlled the absorption and transport of Cd and As by ryegrass. Practically, the application of LF with a soil weight ratio of 2% and MB and MC with a soil weight ratio of 1% can achieve a better remediation effect of Cd and As. |
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