水生植物对水体中放射性锶的富集动态

The dynamic of concentration radio-strontium in water by the aquatic plant

采用模拟污染物的同位素示踪技术研究了水生植物卡州萍、水葫芦和金鱼藻对水体中 89Sr的富集动态。结果表明 :水体中 89Sr的比活度由于水生植物和底泥的吸收或吸附作用随时间而减少 ;水生植物对水体中的 89Sr均具有一定的的富集能力 ,CF值多在 1 0～ 2 0之间 ,最大不超过 3 0 ,经综合比较 ,其中水葫芦的富集能力优于卡州萍和金鱼藻 ,因此可选用水葫芦作为净化水体中放射性锶的生物材料。此外 ,底泥对水体中的 89Sr也具有较强的吸附与固着能力。

The dynamic of concentration 89 Sr in water by the aquatic plant (Azolla caroliniana W., Eichhornia crassipes S. and Ceratophyllum demersum L. ) were studied on simulated pollutants by using the isotope tracer techniques. The results showed that the specific activity of 89 Sr in water decreased with time because of absorption of the aquatic plant and bottom clay. The aquatic plant had some ability of concentration 89 Sr in water. The CF value was about 10-20, and the maximum didn't exceed 30. The ability of Eichhornia crassipes concentration 89 Sr in water was higher than which of the Azolla caroliniana and Ceratophyllum demersum . So the Eichhornia crassipes can be used to purge 89 Sr in water. Moreover, the bottom clay had strong ability of absorption and fixation 89 Sr in water comparatively.