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

    摘要
  • 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.

     

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