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| Effects of different immobilization materials on heavy metal migration in contaminated soil-rape |
| Received:April 09, 2020 |
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| KeyWord:heavy metals;available content;field experiment;rape;passivation |
| Author Name | Affiliation | | SHEN Zhang-jun | School of Life Science, Hefei Normal University, Hefei 230061, China | | HOU Wan-qing | School of Life Science, Hefei Normal University, Hefei 230061, China | | XU De-cong | School of Life Science, Hefei Normal University, Hefei 230061, China | | WU Jiang-feng | School of Life Science, Hefei Normal University, Hefei 230061, China | | JI Tao-tao | School of Life Science, Hefei Normal University, Hefei 230061, China |
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| Abstract: |
| In rape plant(Brassica napus), to compare and analyze the influences of different immobilization materials on the migration and accumulation of heavy metals in contaminated soil, different treatments including sepiolite, chicken manure, straw humus, quicklime, phosphate, and diammonium phosphate were added singly or simultaneously into the cultivated compound contaminated land in a mining area. The results showed that sepiolite effectively reduced the available content of Cu, As, Pb, Cd, and Zn in the soil, and chicken manure effectively reduced the available content of As, Pb, Cd, and Zn in the soil. The available contents of Pb, As, Cd, Zn, and Cu in the sepiolite + chicken manure treatment group were 56.99%, 40.84%, 43.06%, 78.33%, and 52.23% of that in the control group, respectively. The average content of As in rape root was about 2.13, 3.33, and 12.45 times that in the stem, fruit shell, and seed, respectively. Sepiolite + chicken manure treatment had the best effect on reducing the content of As in seeds, which was about 57.07% of that in the control group, and the next was sepiolite + humus treatment. The content of Pb in the seeds in the sepiolite + chicken manure treatment groups was the lowest, which was only 13.26% of that in the control group. The content of Cd in the seeds in the sepiolite + chicken manure treatment groups was only 44.02% of that in the control group. In addition to humus, all the other treatments could effectively reduce the content of Zn in rape organs. The content of Cu in rape organs was also significantly reduced by all the treatments(P<0.05). There was a significant positive correlation between the content of As in rape root and seed and the available content of As in the soil(P<0.05). The available content of Cd in the soil significantly affected the content of Cd in the stem(P<0.01)and significantly correlated with the content of Cd in the shuck and root(P<0.01). The available contents of Pb, Zn, and Cu in the soil had no significant effect on the content of the total heavy metal in rape organs. In summary, the addition of immobilization material treatments has the most significant effect on limiting the absorption, transfer, and accumulation of Zn and Cu in rape, while it has the least limiting effect on those of As. The passivation effect of sepiolite mixed with other materials on heavy metals is more effective than that of a single treatment, among which sepiolite + chicken manure treatment has the best passivation effect. |
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