RADIONUCLIDES ~(137)Cs AND ~(60)Co UPTAKE BY FRESHWATER AND MARINE MICROALGAE CHLORELLA, NAVICULA, PHAEODACTYLUM

摘要

Water plants accumulate to a large extent radionuclides and heavy metals. This fact is used among others for surface water pollution monitoring purposes as well. It is proved that the radioisotopes of some physiological elements, such as ~(32)P, and furthermore the radioisotopes of those elements such as Co, Y, Fe, Ce, Zr are largely accumulated by water plants. These radionuclides concentration in plants is up to four orders higher than in the ambient water milieu. The radioisotopes of elements, Cs, Cr, Sr, I, S, Ca, are much less accumulated. Generally, water plants, which have a large effective surface with the predominant part submerged in water, have a big sorption capacity. These are for example water mosses and algae. Here for example, radiocaesium is most accumulated by the microalgae Oocistis elliptica and Oedogonium sp., by the filamentous algae Cladophora sp. and by the moss Fontinalis antipyretica; a big accumulation capacity has the duckweed Lemna minor.