电动修复对土壤铅形态及伴矿景天铅富集的影响
Effect of Electrokinetic Remediation on Lead Form in Soil and the Enrichment of Sedum Plumbizincicola
朱煊 1马红艳 1石秀顶 2周文怡 1王丽蓉 1蒋明 1熊俊芬 1蒋晨 1李天国3
作者信息
- 1. 云南农业大学资源与环境学院,云南昆明 650201
- 2. 云南农业大学建筑工程学院,云南昆明 650201
- 3. 云南农业大学资源与环境学院,云南昆明 650201;云南农业大学云南省农田无公害生产创新团队,云南昆明 650201
- 折叠
摘要
[目的]研究电动修复对土壤铅(Pb)形态及伴矿景天(Sedum plumbizincicola)Pb富集的影响.[方法]采集云南会泽县者海镇铅锌矿周边污染红壤,开展一维、二维、三维 3种电助植物修复(Electrokinetic-assisted phytoremediation,EKAPR)盆栽试验.[结果]电动力介导下不同分区土壤pH产生差异(阴极区>中间区>阳极区),弱酸可提取态Pb含量提高(最高比试验前增加 8.95倍),在 0～20 V内随电压增大而增加,且阳极区>中间区>阴极区.适宜电动力介导可促进土壤Pb解吸并提高土壤孔隙水Pb含量,也会促进伴矿景天生长(5 V>10 V>20 V、二维>三维>一维),植株地上地下Pb含量与富集量均明显增加.[结论]电动修复促进土壤Pb向弱酸提取态转化,促进伴矿景天对Pb的吸收.
Abstract
[Objective]The aim was to study the effect of electric restoration on soil lead(Pb)morphology and the enrichment of Sedum plumbizincicola.[Methods]One-dimensional(1D),two-dimensional(2D)and three-dimensional(3D)electrokinection-assisted phytoremediation(EKAPR)pot tests were constructed for contaminated red soil around Zhehai Town lead-zinc mine in Huize County,Yunnan Province.[Results]The soil pH values in different zones were different(cathode>middle>anode).The contents of weak acid extractable Pb were increased(up to 8.95 times higher than that before the test)with a trend of the anode>middle>cathode(increased with the voltage in 0-20 V).Appropriate electrokinetic mediation could promote the desorption of Pb in soil and increase the content of Pb in soil pore water as well as the growth of Sedum plumbizincicola(5 V>10 V>20 V,2 D>3 D>1 D),showing that the content and enrichment of Pb in the aboveground and underground parts of plants were significantly increased.[Conclusion]Electric repair could change the form of lead,promoting its transformation to weak acid extraction state and the absorption of Pb by Sedum Plumbizincicola.
关键词
电动修复/伴矿景天/铅形态/富集特征/植物修复Key words
Electrokinetic remediation/Sedum Plumbizincicola/Lead form/Enrichment characteristic/Phytoremediation引用本文复制引用
基金项目
国家自然科学基金(41701362)
云南省自然科学基金(2018FD020)
出版年
2024
NETL
NSTL
万方数据