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| Effects of amendments derived from lignite on Pb, Cd bioavailability of lettuce in calcareous soil |
| Received:October 16, 2016 |
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| KeyWord:modified lignite;amendment;calcareous soil;DTPA-extractable Pb;DTPA-extractable Cd;bioavailability |
| Author Name | Affiliation | E-mail | | DING Man | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | YANG Qiu-yun | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | HUA Dang-ling | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | collegehua@163.com | | SONG Xiao-yan | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | BAO Xiu-li | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | WANG Dai-chang | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | LIU Shi-liang | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | |
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| Abstract: |
| The effect of amendments derived from lignite on DTPA-extractable lead(Pb) and cadmium(Cd) chemical speciation and its effect on lettuce growth in calcareous soil were examined by the pot experiment, eight kinds of lignite-based materials were mixed with Pb and Cd contaminated soil for 60 days, and then lettuce were grew for 60 days, soil DTPA-extractable Pb, Cd(two ethylene three amine five acetic acid) and the absorbed Pb and Cd in lettuce were determined.The results are as follows:humic acid,demineralization, calcium-loaded and activated carbon significantly reduced DTPA-extractable Pb content by 4.67%~7.97%, 5.92%~11.46%, 5.90%~11.80% and 11.69%~26.43% respectively, with the increasing of the materials added,the content of DTPA-extractable Pb decreased,resin and graft copolymerization significantly increased the DTPA-extractable Pb by 5.82%~32.12% and 2.55%~24.76%, nitrification and sulfonation also have the capacity of increasing the DTPA-extractable Pb in soil. The content of DTPA-extractable Pb in soil was significantly influenced by the modified lignites, which was decreased most by the activated carbon treatment, and increased most by resin and graft copolymerization. Lignite, humic acid, demineralization, activated carbon and graft copolymerization reduced DTPA-extractable Cd content in soil, activated carbon and graft significantly decrease it by 5.41%~13.51% and 5.18%~27.70%; nitration, sulfonation and resin significantly improved it by 7.92%~20.13%, 5.74%~21.05% and 21.30%~44.63%. Lignite, humic acid, demineralization, calcium-loaded, activated carbon and grafting could increase the biomass of lettuce;nitration, sulfonation and resin decreased the biomass of lettuce. The relationship of biomass and soil DTPA-extractable Pb, Cd content was negatively correlated. Therefore, several lignite-based materials can significantly change Pb, Cd chemical specification in calcareous soil, significantly affect the growth of lettuce, and have different influence on DTPA-extractable Pb and Cd. |
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