a International Program in Hazardous Substance and Environmental Management, Graduate School , Chulalongkorn University , Bangkok , Thailand.
b Faculty of Engineering, Department of Civil Engineering , Centre of Excellence in Geotechnical and Geoenvironmental Engineering, Chulalongkorn University , Bangkok , Thailand.
Int J Phytoremediation. 2019;21(7):624-633. doi: 10.1080/15226514.2018.1546275. Epub 2019 Feb 8.
Phytoremediation with vetiver was investigated in relation to heavy metal contaminated soil in Thailand. The work compared the performance of two species of vetiver named Songkhla 3 (Chrysopogon zizaniodes) and Prachuap Khiri Khan (Chrysopogon nemoralis) in absorbing lead, zinc, and cadmium in contaminated soils. Toxicity Characteristic Leaching Procedure (TCLP), and Allium tests were conducted to determine toxicity of treated soil. Ethylenediaminetetraacetic acid (EDTA) was also used to increase heavy metals concentration in solution in soil, which led to an increase in translocation and bioaccumulation factors. In general, results showed that concentration of heavy metals decreased in soil and increased in both the shoots and roots of vetivers during a 4-month treatment period. TCLP results indicated that the concentration of zinc and cadmium in contaminated soil was reduced over treatment time, and significantly increased after EDTA was applied. To confirm vetiver performance in phytoremediation, Allium testing showed that remained heavy metals in treated soils had no effect on nucleus aberration. Songkhla 3 and Prachuap Khiri Khan showed similar trends in their ability to remediate lead, zinc, and cadmium from contaminated soil. Both species could accumulate higher concentrations of heavy metals in their shoots and roots over time, and with EDTA application.
在泰国，利用香根草进行了修复重金属污染土壤的研究。这项工作比较了两种香根草（Chrysopogon zizaniodes），即 Songkhla 3 和 Prachuap Khiri Khan，在吸收污染土壤中的铅、锌和镉方面的性能。采用毒性特征浸出程序（TCLP）和葱属植物测试来确定处理土壤的毒性。还使用乙二胺四乙酸（EDTA）来增加土壤中溶液中重金属的浓度，这导致了重金属在植物体内的迁移和生物累积系数的增加。总的来说，结果表明，在 4 个月的处理期间，重金属在土壤中的浓度降低，而在香根草的地上部分和根部中的浓度增加。TCLP 结果表明，污染土壤中锌和镉的浓度随着处理时间的延长而降低，并且在 EDTA 应用后显著增加。为了确认香根草在植物修复中的性能，葱属植物测试表明，处理土壤中残留的重金属对核畸变没有影响。Songkhla 3 和 Prachuap Khiri Khan 在从污染土壤中修复铅、锌和镉的能力方面表现出相似的趋势。随着时间的推移，两种香根草都能在地上部分和根部积累更高浓度的重金属，并且在应用 EDTA 时也是如此。
