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《Journal of Agro-Environment Science》 2016-07
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Long-term stability of immobilizing remediation of a heavy metal contaminated soil with nano-hydroxyapatite

XING Jin-feng;CANG Long;GE Li-qiang;ZHOU Dong-mei;Key Laboratory of Soil Environment and Pollution Remediation,Institute of Soil Science, Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
Nano-particles have been widely used to remediate heavy metal polluted water and soil. Here, a batch of pot experiments were conducted to evaluate the long-term stability of nano-hydroxyapatite(NAP)in remediating heavy metal contaminated soils by applying NAP at rates of 0.5%, 1% and 2%(W/W). Changes of soil properties and content of heavy metals(Cd, Cu, Zn and Pb)in soil and in rice were investigated one year and three years after remediation. Results showed that soil p H rose 0.71~1.24 units in the first year and 0.60~1.16 units in the third year, having little variation over years. After three-year remediation, soil available Cd, Cu and Zn concentrations decreased by 66.6%~98.4% and 62.7%~96.5% for one-year and three-year of remediation, respectively. Available Pb decreased by 61.3%~74.2% in one-year and69.2%~74.4% in three-year of remediation. These results indicated that the immobilization ability of NAP for Cd, Cu and Zn was significantly weakened over time, while was slightly improved for Pb. Addition of NAP significantly reduced heavy metal content in roots and Cd content in brown rice. There was a positive correlation between heavy metal content in brown rice and available heavy metal concentrations in soil, indicating that NAP could reduce heavy metal accumulation in brown rice by reducing their concentrations in soil available heavy metals.
【Fund】: 中国科学院科技服务网络(STS)计划项目(KFJ-EW-STS-06);; 国家自然科学基金项目(21177135)
【CateGory Index】: X53
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