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| Effects of simulated acid rain on releases of phosphorus and cadmium in a contaminated soil immobilized by hydroxyapatite |
| Received:September 07, 2015 |
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| KeyWord:simulated acid rain;hydroxyapatite;leaching;phosphorus;cadmium |
| Author Name | Affiliation | E-mail | | MA Kai-qiang | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | | | CUI Hong-biao | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | cuihongbiao0554@163.com | | FAN Yu-chao | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | | | SU Bin-bin | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | | | HU You-biao | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | | | ZHOU Jing | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| Releases of phosphorus and cadmium from a contaminated soil with and without hydroxyapatite treatment were studied under simulated acid rain with pH of 3.5, 4.5 and 5.6. Results showed that leaching solution pH decreased with decreasing pH in simulated acid rain. However, leaching solution pH was 0.3~1.5 units higher in the hydroxyapatite treated soil than that in the untreated soil. The contents of total phosphorus and orthophosphate in the leaching solution were both increased with decreasing pH in simulated acid rain. Total phosphorus contents at leaching amounts of 1~3 L and 4~6 L were 2.70~3.55 and 1.25~2.15 times higher than the class Ⅴ limit(0.4 mg·L-1) of the Chinese National Quality Standards for Surface Waters(GB 3838-2002) respectively. The concentrations of Cd in the leaching solution decreased significantly in hydroxyapatite amended soil, compared with the untreated soil. The contents of Cd in the leaching solution in the untreated soil increased with the decreasing of pH of simulated acid rain, but they were much slower in the hydroxyapatite amended soil. Our results indicate that applications of hydroxyapatite could decrease the leaching loss of Cd effectively, but might have a potential risk of water eutrophication due to the high leaching loss of phosphorus. |
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