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| Effect of Red Mud, Bone Char and Lime on Uptake and Accumulation of As, Pb and Zn by Maize（Zea mays）Planted in Contaminated Soil |
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| KeyWord:soil; heavy metal; amendments; uptake and accumulation; maize（Zea mays） |
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| Abstract: |
| In order to explore the passivation effect on phytoavailable heavy metals with different amendments（red mud, bone char and lime）and select scientific and effective heavy metals passivator, the effect of red mud, bone char and lime on the uptake and accumulation of lead（Pb）, zinc（Zn） and arsenic（As） by maize（Zea mays） planted in soil contaminated by heavy metals was studied. Five different treatments were designed：control, 5% red mud, 5% bone char, 5% lime, and 2.5% red mud + 2.5% bone char by weight. The maize was harvested 8 weeks after planting, and the concentrations of As, Pb and Zn in the shoots and roots as well as the amount of phytoavailable heavy metals in the soil was measured. The results showed that the different amendments could all increase the shoot biomass significantly, with the largest increase by the 5% bone char treatment. The amendments decreased the concentration of Pb and Zn in the shoots by 70.9%~89.1% and 78.3%~89.7%, and in root by 50.0%~67.5% and 91.0%~94.3%, respectively, compared with the control. The effect of the amendments on the concentration of As in maize differed compared to the control. As concentrations in both the shoots and roots decreased significantly when treated with 5% red mud and 2.5% red mud + 2.5% bone char, while the concentrations increased markedly when treated by 5% bone char and 5% lime. The applications of different amendments decreased the amount of Pb and Zn in soils that was available for uptake by plants, but increased the availability of As. The results indicated that red mud, bone char and lime are potential amendments for modifying acidic soil contaminated by heavy metals. The study provided new potential materials for remediation of heavy metal contaminated soils. |
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