DETERMINATION OF RARE-EARTH ELEMENTS IN RICE BY INAA AND ICP-MS

irrigation of rice plants with a solution of rare earth elements incre ases both the production capacity and the resistance to disease. Assum ing that the treated plants remain expendable, the different parts of plants, root stalk and grain, were analyzed by instrumental neutron ac tivation analysis (INAA) and by mass spectrometry after plasma excitat ion (ICP-MS). About 40 elements were determined. The results showed th at the contamination remained in the roots and was absent in rice grai ns. The analytical distribution of different elements in different par ts of both treated and non-treated plants has given some information c oncerning the possible effect of the rare earth treatment. The perform ances of the two analytical methods have been compared.