主要芝草による放射性物質の吸収除去能に関する実験的研究

抄録

In this study, we used to turf grasses which removing ¹³⁷Cs, ¹³⁴Cs and ¹³³Cs from the red clay as relatively safe and environmentally method. We have conducted two experiments (¹³⁷Cs, ¹³⁴Cs contaminated field test in Fukushima prefecture and pot experiment in ¹³³Cs added soil under controlled condition) to determine the ability of four grass species (Festuca arundinacea Schre., Lolium perenne L., Poa pratensis L., Cyno dactylon Pers.) to extract Cs isotopes from contaminated soil. The result shows that 1) ¹³⁷Cs, ¹³⁴Cs and ¹³³Cs uptake by all species increases according to the level of Cs concentration of soil; 2) all turf grasses became a low to translocation ability of ¹³³Cs to stem as compared with Brassica napus L.; 3) all species occur growth inhibition from the 500 mg/kg ¹³³Cs treatment; 4) the effective usage of oxalic acid on the phytoremediation of ¹³³Cs was not proved. In conclusion, the turf grasses were proved to have low accumulation capability for Cs isotopes. The essence aspect of the problem is to find the workable technique to dissolving out the Cs isotopes which strongly absorbed by the soil, and it requires for further investigation.