首页|Effects of rape straw and red mud on extractability and bioavailability of cadmium in a calcareous soil
Effects of rape straw and red mud on extractability and bioavailability of cadmium in a calcareous soil
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Screening of cost-effective soil amendments is important to develop "in situ" remediation techniques for cadmium (Cd) contaminated soils.In this study,different soil amendments,including red mud,a by-product of the alumina industry,and acid-treated,nano-treated by nanoparticle milling,nano and acid-treated red muds,zeolite,corn straw,and rape straw,were evaluated to immobilize Cd in two added levels (2 and 5 mg Cd·kg-1 soil) in a calcareous soil by single and sequential extractions and by cucumber (Cucumis sativus L.) pot experiments.Results indicated that cruciferous rape straw significantly decreased the concentrations of water soluble,extractable Cd in soils,and Cd in cucumber plants,and it was more effective than gramineous corn straw.Also,red mud generally decreased the extractability and bioavailability of Cd added to calcareous soils more effectively than zeolite.Furthermore,the efficiency of red mud could be increased by the treatment of nano-particle milling due to the increase in specific surface area of red mud.It is potential to use rape straw and red mud as soil amendments to develop a cost-effective and efficient "in situ" remediationtechnology for Cd mildly contaminated calcareous soils.
red mudrape strawcadmiumimmobilizationcalcareous soil
Junxing YANG、Liqun WANG、Jumei LI、Dongpu WEI、Shibao CHEN、Qingjun GUO、Yibing MA
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Centre for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
National Soil Fertility and Fertilizer Effects Long-term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
The Key Laboratory of Resource Environment and GIS, College of Resource Environment and Tourism, Capital Normal University, Beijing 100037, China
This work was financially supported by Special Fund for Agro-scientific Research in the Public InterestThis work was financially supported by Special Fund for Agro-scientific Research in the Public InterestWe are also very grateful to the National Natural Science Foundation of ChinaWe are also very grateful to the National Natural Science Foundation of China
200903015 973 Program 2014CB238906863 Program 2013AA06A21r24120131241250110528
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