Department of Civil and Environmental Engineering, College of Engineering, Seoul National University, 1 Gwanak-ro, Gwanakgu, Seoul, 08826, Republic of Korea.
Department of Civil and Environmental Engineering, Hanbat National University, Dongseo-daero 125, Yuseong-gu, Daejeon, 34158, Republic of Korea.
Chemosphere. 2023 Oct;337:139341. doi: 10.1016/j.chemosphere.2023.139341. Epub 2023 Jun 26.
Greenhouse experiments were conducted to test the phytoextraction potential of sunflower (Helianthus annuus L.) and rape (Brassica napus L.) during the initial growth in the heavy metal (i.e., Cd, Ni, Zn, and Pb) contaminated soil. The target plants were grown for 30 d in pots filled up with soil treated with various concentrations of heavy metals. The wet/dry weights of plants and heavy-metal concentrations were measured, and the bioaccumulation factors (BAFs) and Freundlich-type uptake model were then used to measure their capacities of phytoextracting accumulated heavy metals from the soil. It was observed that the wet/dry weights of sunflower and rapeseed decreased, and heavy-metal mass uptake increased in plants commensurate with the elevating heavy metal concentrations in the soil. The sunflower BAF for heavy metals was higher than that of rapeseed. The Freundlich-type uptake model suitably described the phytoextraction capacities of sunflower and rapeseed in a soil contaminated with a single heavy metal and can be used to compare the phytoextraction capacities of different plants for the same heavy metal or of the same plant with different heavy metals. Although this study is based on limited data from two species of plants and soils contaminated with one heavy metal, it provides a basis for evaluating the ability of plants to accumulate heavy metals during their initial growth stages. Additional studies utilizing diverse hyperaccumulator plants and soils polluted with multiple heavy metals are essential to enhance the suitability of the Freundlich-type uptake model for assessing the phytoextraction capacities of intricate systems.
温室实验用于测试向日葵（Helianthus annuus L.）和油菜（Brassica napus L.）在重金属（即 Cd、Ni、Zn 和 Pb）污染土壤中的初始生长阶段的植物提取潜力。将目标植物在装有用不同浓度重金属处理过的土壤的盆中生长 30 天。测量植物的湿/干重和重金属浓度，然后使用生物积累因子（BAF）和 Freundlich 型吸收模型来衡量它们从土壤中提取积累重金属的能力。观察到向日葵和油菜的湿/干重随着土壤中重金属浓度的升高而降低，植物对重金属的质量吸收增加。向日葵对重金属的 BAF 高于油菜。Freundlich 型吸收模型适当地描述了单一重金属污染土壤中向日葵和油菜的植物提取能力，可用于比较不同植物对同一重金属的提取能力，或同一植物对不同重金属的提取能力。尽管这项研究基于两种植物和受一种重金属污染的土壤的有限数据，但它为评估植物在其初始生长阶段积累重金属的能力提供了基础。利用多种超积累植物和受多种重金属污染的土壤进行更多研究对于提高 Freundlich 型吸收模型评估复杂系统的植物提取能力的适用性至关重要。
