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Effects of Different Heavy Metal Amendments on Soil Colloid

ZHU Zhen-qiu;ZHOU Jing;XU Lei;LIU Chuang-hui;GAO Min;LIANG Jia-ni;Institute of Soil Science,Chinese Academy of Sciences;National Engineering Research and Technology Center for Red Soil Improvement/Red Soil Ecological Experiment Station,Chinese Academy of Sciences;University of Chinese Academy of Sciences;School of Environment Science and Engineering,Chang'an University;  
An in-lab incubation experiment was conducted to explore effects of soil amendments,i.e.micro-hydroxyapatite,nano-hydroxyapatite,apatite,ash from biomass burning power plants and lime,used to remedy heavy metals contaminated soils on content of soil colloid,and content and distribution of heavy metals in the colloid.Results show that the soil treated with lime was the highest in content of soil colloid(119 g·kg~(-1),131%),and then followed by the other four in a decreasing order,that is,the soils treated with micro-hydroxyapatite(118 g·kg~(-1),130%),with nano-hydroxyapatite(115 g·kg~(-1),124%),with apatite(82.9 g·kg~(-1),61.7%) and with power plant ash(80.6 g·kg~(-1),57.1%).The treatment with lime,power plant ash or apatite decreased the content of Cd in the colloid significantly or with a rate ranging from 12.1% to 24.0%,while the treatment with apatite,micro-hydroxyapatite ornano-hydroxyapatite decreased the content of Cu in the colloid significantly or with a rate ranging from 14.2% to 20.5%.Besides,the use of any of the five soil amendments increased the distribution ratios of Cd and Cu in the soil colloid,especially the use of nano-hydroxyapatite with an application rate being 1%,which increased the distribution ratio of Cd,up to 69.9% or by 154%,and the use of lime which increased the distribution ratio of Cu in soil colloid up to 47.5% or by 135%.The findings of this study demonstrate that the use of soil amendments to remedy heavy metals contaminated soils may increase the content of soil colloid and distribution ratios of heavy metals in the colloid.It is necessary to monitor the content of soil colloid and the content of heavy metals in the soil colloid during soil remediation,so as to intensify risk management of the soil remediation process.
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