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| Effects of different passivators on heavy metals(Cadmium /Chromium/ Plumbum) in soil withchicken manure organic fertilizer |
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| Abstract: |
| Taking tobacco as the research plant，by pot culture test method，the influences of different passivatorson the heavy metals（ Cd，Cr，Pb） contained in soil with chicken manure bio-organic fertilizer were studied with themethod of continuous extraction. The results showed that the application of passivator made the soil pH increased，buthad no effect on the normal growth of flue-cured tobacco plants. Applying different passivators could reduce the percentof exchangeable heavy metal as same as the amount of heavy metal in plant，and there was no significant differenceamong the different treatments. Different passivators had different effects on each heavy metal，fly ash + bentonitecombination was the best passivator for heavy metals，compared with the control treatment，exchangeable and carbonatefraction distribution rates of Cd，Cr and Pb in fly ash + bentonite treatment decreased by 27.79%，14.91% and 12.45%，respectively. The passivation effects of fly ash + peat and sepiolite + K-feldspar treatments were less than that of fly ash+ bentonite treatment，and the passivation effects of zeolite + bentonite，zeolite + peat，and fly ash + zeolite treatmentswere the worst. |
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