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| Application of modified nano-particle black carbon for the remediation of soil heavy metal pollution. |
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Abstract A modified nano-particle carbon black (nano-CB) was used as amendment for controlling the bioavailability of Cu and Zn in soil by cultivation experiment. The nano-CB significantly reduced the bioavailability of soil Cu and Zn. Compared with the control, the bioavailable soil Cu concentration decreased about 47.3%, 72.0% and 80.89% after 60days of cultivation with 1%, 3%, and 5% nano-CB, respectively; bioavailable soil Zn concentration decreased by 3.0%, 17.7% and 43.6%, respectively. The treatment of packet application was not better than mixed application and needed more time for equilibrium, but the CB which adsorbed heavy metal from soil could be easily taken out. Nano-CB amendment significantly increased biomass of ryegrass and reduced the uptake of Cu and Zn concentration in ryegrass. Application of nano-CB reduced exchangeable and cabonate-bound soil Cu and Zn in ryegrass rhizosphere, and increased the proportion of organic/sulphide fractions.
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Received: 16 September 2008
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