小球藻对水中稀土元素的摄取

UPTAKE OF RARE EARTH ELEMENTS BY ALGAE (CHLORALLA PYRENO1DOSA) IN AQUATIC SYSTEM

本文研究了小球藻对水体中轻、中和重稀土元素的摄取。结果表明:小球藻对水中可溶性稀土元素有高的富集能力。摄取动力学为首先迅速吸附在藻细胞表面,随后相对缓慢地扩散到细胞内部,动力学方程可近似表示为C_t=A(1—e^(-K_2t))。稀土元素在藻中的生物积累量与溶液中稀土元素浓度成正相关,藻对稀土元素摄取的BCF值分别为:La 2.44×10~4,Gd 2.47×10~4和Y 2.44×10~4。在试验条件下没有观察到混合稀土元素对藻的协同作用和拮抗作用。

Uptake of light, medium and heavy rare earth elements (REEs) by algae in aquatic system was investigated. The results showed that algae has high ability to enrich dissoloved REEs in aquatic system. The kinetics of uptake was established to be a fast surface binding with algae followed by a relatively slow diffusion-controlled uptake into the inside of the cell. The kinetic equations may be written as Ct=A(1- e-K2t) on the basis of the experiment data. The results also showed that bioaocumulation of REEs in algae was correlated with the concentration of REEs in solution. The BCF obtained was La 2.44 ×104 Gd 2.47 × 104 and Y 2.44 ×104, respectively. Synergistic effect and antagonistic effect of mixed RE solution for algae were not observed under the test condition.