Effects of rape straw and red mud on extractability and bioavailability of cadmium in a calcareous soil

文献类型： 外文期刊

第一作者： Yang, Junxing

作者： Yang, Junxing;Guo, Qingjun;Yang, Junxing;Wang, Liqun;Li, Jumei;Wei, Dongpu;Chen, Shibao;Ma, Yibing;Wang, Liqun

作者机构：

关键词： red mud;rape straw;cadmium;immobilization;calcareous soil

期刊名称：FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING （ 影响因子：4.357； 五年影响因子：3.688 ）

ISSN： 2095-2201

年卷期： 2015 年 9 卷 3 期

页码：

收录情况： SCI

摘要： 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 center dot 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" remediation technology for Cd mildly contaminated calcareous soils.

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