Salama Ahmed K, Osman Khaled A, Gouda Neama Abdel-Razeek
a Chemistry Department , Faculty of Science, Majmaah University , Zulfi , KSA.
b Chemistry of Pesticides Department , Faculty of Agriculture, Alexandria University , Alexandria , Egypt.
Int J Phytoremediation. 2016;18(4):364-7. doi: 10.1080/15226514.2015.1109597.
The research was designated to study the ability of plants to bio-accumulate, translocate and remove the heavy metals, lead and cadmium from contaminated soil. The herbal plant ryegrass, Lolium multiflorum was investigated as a bio-accumulator plant for these metals. The translocation of these heavy metals in the herbal plant was compared considering root to shoot transport and redistribution of metals in the root and shoot system. The trace metal contents from root and shoot parts were determined using atomic absorption spectrometer. The results showed that the percent of lead and cadmium transferred to ryegrass plant were averaged as 51.39, and 74.57%, respectively, while those remained in the soil were averaged as 48.61 and 25.43% following 60 days of treatment. The soil-plant transfer index in root and shoot system of ryegrass was found to be 0.32 and 0.20 for lead, and 0.50 and 0.25 for cadmium. These findings indicated that the herbal plant ryegrass, Lolium multiflorum is a good accumulator for cadmium than lead. The soil-plant transfer factor (the conc. of heavy metal in plant to the conc. in soil) indicated that the mechanism of soil remedy using the investigated plant is phytoextraction where the amounts of heavy metals transferred by plant roots into the above ground portions were higher than that remained in the soil. The method offers green technology solution for the contamination problem since it is effective technology with minimal impact on the environment and can be easily used for soil remedy.
该研究旨在探讨植物对受污染土壤中重金属铅和镉的生物累积、转运及去除能力。对草本植物多花黑麦草作为这些金属的生物累积植物进行了研究。考虑到这些重金属在草本植物中的从根到地上部分的转运以及在根和地上部分系统中的重新分布，对其在草本植物中的转运情况进行了比较。使用原子吸收光谱仪测定根和地上部分的痕量金属含量。结果表明，经过60天处理后，转移到多花黑麦草植物中的铅和镉的百分比平均分别为51.39%和74.57%，而留在土壤中的铅和镉的百分比平均分别为48.61%和25.43%。多花黑麦草根和地上部分系统中土壤-植物转移指数，铅分别为0.32和0.20，镉分别为0.50和0.25。这些发现表明，草本植物多花黑麦草对镉的累积能力优于铅。土壤-植物转移因子（植物中重金属浓度与土壤中重金属浓度之比）表明，使用所研究植物进行土壤修复的机制是植物提取，即植物根系将重金属转移到地上部分的量高于留在土壤中的量。该方法为污染问题提供了绿色技术解决方案，因为它是一种对环境影响最小的有效技术，并且可轻松用于土壤修复。
