a Facultad Regional Trenque Lauquen , Universidad Tecnológica Nacional , Buenos Aires , Argentina.
b Instituto de Química de San Luis, INQUISAL, Centro Científico-Tecnológico de San Luis (CCT-San Luis), Consejo Nacional de Investigaciones Científicas , Universidad Nacional de San Luis , Ciudad de San Luis , Argentina.
Int J Phytoremediation. 2019;21(7):693-698. doi: 10.1080/15226514.2018.1556588. Epub 2019 Jan 18.
The capacity of Elodea canadensis to phytofiltrate arsenic species from water was evaluated. Plants were adapted to tap water and supplemented with 15 and 250 µg L of As. Inorganic arsenic species (As III, As V), and organic arsenic compounds: monomethylarsonate (MMA) and dimethylarsinate (DMA) were analyzed. Sampling was carried out at different times after exposure in culture water and plant organs. Plants exposed to 15 µg L of As concentration showed no significant difference on As concentration (95% confidence level) in their organs compared to controls. When plants were exposed to 250 µg L of As concentration, a significant increase of As concentration in plant organs was observed. After 1 h exposure, plants reduce 63.16% the As concentration in the culture water, with a bioaccumulation factor (BF) of 4.3. Under these conditions, E. canadensis accumulate As V in roots and do not translocate it to stems (transfer factor <1). MMA was determined in stems and leaves. E. canadensis effectively phytofiltrate As from tap water of a city located in an arsenic endemic area from concentrations of 36 µg L to undetectable levels (10 ng L).
研究了加拿大眼子菜对水中砷形态的植物过滤能力。将植物适应于自来水，并补充 15 和 250 μg/L 的砷。分析了无机砷形态（As III、As V）和有机砷化合物：一甲基砷酸盐（MMA）和二甲基砷酸盐（DMA）。在暴露于培养液和植物器官后的不同时间进行采样。与对照相比，暴露于 15 μg/L 砷浓度的植物在器官中的砷浓度（置信水平为 95%）没有显著差异。当植物暴露于 250 μg/L 的砷浓度时，观察到植物器官中的砷浓度显著增加。暴露 1 小时后，植物将培养液中的砷浓度降低了 63.16%，生物积累因子（BF）为 4.3。在这些条件下，E. canadensis 在根中积累 As V，而不将其转运到茎中（转运因子 <1）。在茎和叶中测定了 MMA。E. canadensis 有效地从砷流行地区的城市自来水中过滤砷，将浓度从 36 μg/L 降低到无法检测的水平（10 ng/L）。
