Immobilization of heavy metals in two contaminated soils using a modified magnesium silicate stabilizer
Immobilization of heavy metals in two contaminated soils using a modified magnesium silicate stabilizer
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使用改性硅酸镁稳定剂固定两种受污染土壤中的重金属
DOI：
10.1007/s11356-018-3140-6
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发表时间：
2018-09
影响因子：
5.8
通讯作者：
Li Yue
中科院分区：
文献类型：
--
作者：
Yuan Xingzhong;Xiong Ting;Wang Hou;Wu Zhibin;Jiang Longbo;Zeng Guangming;Li Yue
重金属污染是一个严重的环境问题。为了开发有效的稳定剂，已经做了大量的工作。本文采用水热法制备了碳改性硅酸镁（MS-C），并将其用于两种不同理化性质的重金属污染土壤的修复。土壤样品暴露于不同剂量的MS-C超过60天（1，3，和5重量%）。采用毒性特征浸出法（TCLP）和社区参考局连续提取法（BCR）评价了修复效果。添加MS-C后，两种土壤中重金属的生物有效性降低了20- 86.7%，毒性降低了26.6-73.2%。土壤pH值和水溶性有机碳（WSOC）均有所增加。土壤微生物生物量增加，说明土壤状况得到改善。MS-C对重金属的固定化主要是通过静电吸引和阳离子交换作用实现的。pH/WSOC与可提取态重金属含量呈显著负相关，表明pH/WSOC对重金属稳定化具有积极作用。因此，这种新型稳定剂在单金属和多金属污染土壤修复中具有很大的应用潜力。
Heavy metal contamination is a severe environmental issue over the world. A lot of work has been done to develop effective stabilizers. In the present work, hydrothermal carbon-modified magnesium silicate (MS-C) was synthesized and used for the remediation of two heavy metal-polluted soils with different physicochemical properties. Soil samples were exposed to different doses of MS-C over 60 days (1, 3, and 5 wt%). The toxicity characteristic leaching procedure (TCLP) and the community bureau of reference sequential extraction procedure (BCR) were used to evaluate the remediation efficiency. The bioavailability of heavy metals in both soils was reduced by 20–86.7%, and the toxicity of heavy metals was reduced by 26.6–73.2% after MS-C added. Meanwhile, soil pH and water soluble organic carbon (WSOC) were increased. In addition, soil microbial biomass was increased, which indicated the improvement of soil condition. The immobilization of heavy metals was mainly caused by electrostatic attraction and cation exchange between MS-C and heavy metals. The significantly negative correlation between extractable heavy metals and pH/WSOC indicated the positive role of pH/WSOC in metal stabilization. Thus, this new stabilizer holds great application potentials for both single and multi-metal-contaminated soil remediation.
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影响因子：
15.1
作者：
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影响因子：
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作者：
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通讯作者：
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DOI：
10.1016/s0165-9936(03)00303-0
发表时间：
2003-03
期刊：
Trends in Analytical Chemistry
影响因子：
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作者：
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通讯作者：
À. Sahuquillo;A. Rigol;G. Rauret