Department of Geology, Environmental and Earth Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia.
Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia; University Malaya Centre for Ionic Liquids (UMCiL), University of Malaya, Kuala Lumpur 50603, Malaysia.
J Environ Sci (China). 2018 Oct;72:140-152. doi: 10.1016/j.jes.2017.12.022. Epub 2018 Jan 5.
The toxicity and kinetic uptake potential of zinc oxide (ZnO) and titanium dioxide (TiO) nanomaterials into the red bean (Vigna angularis) plant were investigated. The results obtained revealed that ZnO, due to its high dissolution and strong binding capacity, readily accumulated in the root tissues and significantly inhibited the physiological activity of the plant. However, TiO had a positive effect on plant physiology, resulting in promoted growth. The results of biochemical experiments implied that ZnO, through the generation of oxidative stress, significantly reduced the chlorophyll content, carotenoids and activity of stress-controlling enzymes. On the contrary, no negative biochemical impact was observed in plants treated with TiO. For the kinetic uptake and transport study, we designed two exposure systems in which ZnO and TiO were exposed to red bean seedlings individually or in a mixture approach. The results showed that in single metal oxide treatments, the uptake and transport increased with increasing exposure period from one week to three weeks. However, in the metal oxide co-exposure treatment, due to complexation and competition among the particles, the uptake and transport were remarkably decreased. This suggested that the kinetic transport pattern of the metal oxide mixtures varied compared to those of its individual constituents.
研究了氧化锌（ZnO）和二氧化钛（TiO）纳米材料对红小豆（Vigna angularis）植物的毒性和动力学吸收潜力。结果表明，由于 ZnO 高溶解和强结合能力，它很容易在根组织中积累，并显著抑制了植物的生理活性。然而，TiO 对植物生理学有积极影响，导致植物生长得到促进。生化实验的结果表明，ZnO 通过产生氧化应激，显著降低了叶绿素含量、类胡萝卜素和应激控制酶的活性。相反，在用 TiO 处理的植物中没有观察到负面的生化影响。对于动力学吸收和运输研究，我们设计了两种暴露系统，其中 ZnO 和 TiO 分别或混合暴露于红豆幼苗。结果表明，在单一金属氧化物处理中，随着暴露期从一周增加到三周，吸收和运输都增加了。然而，在金属氧化物共暴露处理中，由于颗粒之间的络合和竞争，吸收和运输显著减少。这表明金属氧化物混合物的动力学运输模式与单个成分的运输模式不同。
