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| Passivating effects of applying heavy metal passivation agents containing zero-valent aluminum on cadmium(Cd) and plumbum(Pb) in vegetable-soil system |
| Received:January 05, 2017 |
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| KeyWord:deoxidized aluminum powder;heavy metal passivating agent;vegetable-soil system;cadmium(Cd);plumbum(Pb);passivation |
| Author Name | Affiliation | E-mail | | HUANG Dong-feng | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | WANG Li-min | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | LI Wei-hua | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | QIU Xiao-xuan | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | LUO Tao | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | luotaofjfz@188.com |
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| Abstract: |
| With zero-valent aluminum, sulfur, and calcium hydroxide as the main raw materials, a few heavy metal passivating agents have been made according to a certain weight proportion of these materials. A soil-pot trial was also conducted to investigate the effects of using these heavy metal passivating agents on the vegetable yield, contents of cadmium and plumbum in vegetables, and their available contents in soils. The results of "Pollution soil + chemical fertilizer"(i.e., treatment of "PS+CF") showed that the use of passivating agents would increase the vegetable yield and decrease the contents of Cd and Pb in vegetables, enhance the soil pH, but reduce the available contents of Cd and Pb in soils to a certain extent(i.e., treatment of "PS+CF+Al1", "PS+CF+Al2", "PS+CF+Al3", and "PS+CF+Al4"). Among them, the effects of the "PS+CF+Al4" treatment were comparatively the best; it could increase the vegetable yield by 32.48%, decrease the contents of Cd and Pb in vegetables by 71.95%~74.69% and 63.36%~74.69%, respectively, and enhance the soil pH by 28.72%, but reduce the available contents of Cd and Pb in soils by 12.50% and 32.42%, respectively. X-ray diffraction analysis showed that Cd and Pb in the "PS+CF+Al4" soils mainly exist as Cd3(PO4)2, Pb(PO2)2, Pb2(P4O12), Pb3O2SO4, and other insoluble forms. This is further evidence of the passivation effect of the composite passivation agent. Therefore, heavy metal passivating agents containing zero-valent aluminum(i.e., Al4) has an obvious passivation effect on Cd and Pb in the vegetable-soil system. |
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