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| In-situ remediation of a multi-metal contaminated acid soil using organic-inorganic mixed amendments——Evaluation by heavy metal fractions and phytoavailability |
| Received:December 27, 2016 |
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| KeyWord:multi-metal contaminated soil;mixed amendments;bioavailability;zeolite;limestone;phosphate fertilizers;organic matter |
| Author Name | Affiliation | E-mail | | ZOU Fu-zhen | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Donglee Environmental Co., Ltd., Guangzhou 510335, China | | | LONG Xin-xian | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | longxx@scau.edu.cn | | YU Guang-wei | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | HUANG Li-min | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | ZHAO ren-xin | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | |
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| Abstract: |
| In this study, a pot experiment was conducted to study the effects of mixed soil amendments containing zeolite, limestone, phosphate rock, and farmyard manure on soil pH and the phytoavailibility of Cu, Zn, and Pb in multi-metal contaminated acid soil collected from the Shangba Village of Shaoguang City in Guangdong Province, China. The results showed that four types of mixed amendments significantly increased soil pH(0.52~1.76) and reduced the bioavailable Zn, Cu, and Pb concentrations in the soil by 70.92%~99.29%, 69.47%~98.45%, and 67.22%~99.17%, respectively. Moreover, there were significant negative correlations between soil pH and bioavailable Cu, Zn, and Pb contents. In the control group(CK), seed germination and growth of Brassica campestris L. and Lactuca sativa L. were all largely inhibited and shoot Zn, Cu, and Pb concentrations were higher than the National Standards for Food Hygiene. However, all the plants were healthy and shoot Pb, Cu, and Zn concentrations significantly decreased in amended soil. Moreover, the heavy metal speciation analysis results showed that the Pb, Cu, and Zn exchangeable concentrations also decreased, while the Fe-Mn oxide-bound concentrations increased in amended soil. Therefore, the application of mixed amendments increased the soil pH and promoted the transformation of heavy metals from the exchangeable fraction to the Fe-Mn oxide-bound fraction, and thus, reduced the bioavailability of heavy metals. The mixed amendments can be used for in-situ remediation of heavy metal-polluted soil in the future. |
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