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| Effects of hydroxyapatite plus zeolite on bioavailability and rice bioaccumulation of Pb and Cd in soils |
| Received:July 03, 2015 |
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| KeyWord:heavy metal;combined amendment;bioavailability;rice;soil |
| Author Name | Affiliation | E-mail | | ZOU Zi-jin | College of Environmental Sciences and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | ZHOU Hang | College of Environmental Sciences and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | WU Yu-jun | College of Environmental Sciences and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | ZHOU Xin | College of Environmental Sciences and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | ZHU Wei | College of Environmental Sciences and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | ZENG Min | College of Environmental Sciences and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | PENG Pei-qin | College of Environmental Sciences and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | LIAO Bo-han | College of Environmental Sciences and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | liaobh1020@163.com |
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| Abstract: |
| Hydroxyapatite and zeolite have been used to reduce bioavailability of heavy metals in soils. Here a plot experiment was designed to examine the effects of hydroxyapatite plus zeolite(HZ) on the bioavailability and brown rice bioaccumulation of Pb and Cd in two paddy soils near mining areas in southern Hunan, China. HZ was applied to the surface soil at rates of 0, 0.45, 0.9 kg·m-2 and 1.8 kg·m-2. Results indicated that:Compared with the control, applying 1.8 kg·m-2 of HZ reduced soil extractable Pb by 69.6%, 80.0%, and 87.4% in Soil A, and 73.8%, 65.8%, and 99.8% in Soil B, respectively for DTPA, TCLP, and MgCl2, while DTPA, TCLP, and MgCl2-extractable Cd respectively decreased by 62.0%, 41.8%, and 19.4% in Soil A, and 82.7%, 65.1%, and 94.5% in Soil B. Adding HZ at 0.45~1.8 kg·m-2 decreased Pb and Cd content in brown rice by 36.4%~48.5% and 4.9%~17.0% in Soil A and 5.0%~41.3% and 16.7%~20.2% in Soil B, respectively, as compared with the control. Correlation analysis showed that soil pH was one of key factors decreasing migration and bioavailability of Pb and Cd in soils after HZ applications. DTPA-extractable Pb and Cd were a better indicator of their bioavailability in soils. |
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