In this work, Spirodela intermedia and Pistia stratiotes, autochthonous floating macrophytes, were used to remove aqueous UO₂²⁺ (1 and 10 mg.L⁻¹) under laboratory conditions. The influence of Th⁴⁺(1 mg.L⁻¹) was studied for the highest concentration of U(VI).

All the parameters of the bioremediation process, bioconcentration factors (BCFs) in roots and leaves and translocation factors (TFs), were achieved by microPIXE quantification. This analysis was carried out using a 50-MeV ¹⁶O⁵⁺ beam with the aid of the heavy-ion microprobe at the TANDAR Laboratory in Buenos Aires. High resolution 2D maps of the in vivo elemental distribution in macrophytes for different conditions were obtained. Both plants have the ability to accumulate a large amount of U(VI) yielding BCFs > 500. Only S. intermedia can additionally uptake Th(IV) reaching a high BCF (>300 at 96 h) but the plant does not survive; Th was detected within the chlorenchyma ([Th] ≅ 30 µg.g⁻¹).

在这项工作中，在实验室条件下，使用了中间螺旋藻和自生浮游水生植物水浮萍，去除了UO ₂ ²⁺（1和10 mg.L ^-1）水溶液。研究了最高浓度的U（VI）对Th ⁴⁺（1 mg.L ^-1）的影响。

通过microPIXE定量获得了生物修复过程的所有参数，根和叶中的生物浓缩因子（BCF）和转运因子（TF）。分析是在布宜诺斯艾利斯TANDAR实验室借助重离子微探针使用50-MeV ¹⁶ O ⁵⁺束进行的。获得了不同条件下大型植物体内元素分布的高分辨率二维图。两种植物都有能力积累大量的U（VI），产生的BCF>500。只有中间链球菌可以摄取Th（IV），达到较高的BCF（96 h> 300），但该植物无法存活。在小鳞癌中检测到Th（[Th]≅30 µg.g ^-1）。