Uptake, accumulation, phytotoxicity, and removal of 2,4‐dichlorophenol in willow trees
Uptake, accumulation, phytotoxicity, and removal of 2,4‐dichlorophenol in willow trees
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DOI：
10.1897/06-353r1.1
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发表时间：
2007-06
影响因子：
4.1
通讯作者：
Ahmed Suheyl Ucisika;S. Trapp;K. O. Kusk
中科院分区：
文献类型：
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作者：
Ahmed Suheyl Ucisika;S. Trapp;K. O. Kusk
研究了柳树对2,4‐二氯苯酚（2,4‐DCP）的吸收、积累、毒性和去除之间的关系，以及采用植物修复方法处理废水和土壤中2,4‐DCP污染的可行性。在恒定光照下，柳树暴露于不同浓度的2,4 - DCP （5 - 150mg /L的水培溶液和9.1 - 44.4 mg/L的沙子中）。树木的蒸腾作用被用来测定毒性作用。在水培溶液和沙子中，大约在2,4 - DCP浓度为20 mg/L时开始严重抑制蒸腾作用。浓度越高，杨柳的积累量越高。在幸存的树木中，化学物质从系统中流失了65%以上。在没有树木的情况下进行的实验中，2,4 - DCP的质量损失仅为8 - 14%。对于离根的树木，实验结束时营养液中残留的2,4 - DCP量明显高于完整树木的实验。结果表明，在根区，根细胞或相关微生物的降解是培养基中2,4 - DCP去除的主要原因。由于2,4 - DCP对树木的高毒性和有限的去除效率，柳树的植物修复似乎不是一种修复选择。
The relation between uptake, accumulation, toxicity and removal of 2,4‐dichlorophenol (2,4‐DCP) in willow trees (Salix viminalis) and the feasibility of implementing phytoremediation as a treatment method for 2,4‐DCP contamination in wastewater and soil were investigated. Willows were exposed to various 2,4‐DCP concentrations between 5 and 150 mg/L in hydroponic solution and between 9.1 and 44.4 mg/L in sand under constant illumination. The transpiration of the trees was used to determine toxic effects. In both hydroponic solution and sand, severe inhibition of transpiration started approximately at 2,4‐DCP concentrations of 20 mg/L. Accumulation in willows was increased with higher concentrations. In surviving trees, the loss of chemical from the system was above 65%. In experiments performed without trees, the mass loss of 2,4‐DCP was only 8 to 14%. For trees with detached roots, there was a significantly higher amount of 2,4‐DCP remaining in the nutrient solution at the end of the experiment compared to experiments with the intact trees. The results indicate that degradation in the root zone, either by root cells or associated microorganisms, is the main reason for the removal of 2,4‐DCP from the media. Phytoremediation of 2,4‐DCP with willow trees does not seem to be a remediation option because of its high toxicity to trees and the limited removal efficiency.