Adsorption of radionuclides on silica and their uptake by rice plants from silica-multitracer solutions - The effects of pH

作者：Ozaki T^*; Ambe S; Abe T; Francis AJ

来源：Biological Trace Element Research, 2002, 90(1-3): 273-281.

DOI：10.1385/BTER:90:1-3:273

• pH effect
• radionuclide
• rice plant
• silica
• uptake

We investigated the effect of solution pH on the adsorption on silica of a mixture radionuclides Rb-83, Sr-85, Mn-54, Zn-65, Y-88, and Se-75 generated from irradiation of Ag in a 135-MeV/nucleon C-12 beam accelerated by the RIKEN Ring Cyclotron and (CS)-C-137 obtained commercially. Then, we related these findings to their uptake by a rice plant (Oryza sativa L. cv. Koshihikari) from a silica-multitracer solution at pH 4.3 +/- 0.2 and at 5.3 +/- 0.2. To evaluate both adsorption and uptake, precisely we used a multitracer technique that simultaneously tracked the movements of all of the radionuclides. There was an increase in the uptake of Rb, Cs, Sr, Mn, and Zn by the rice plants with the increase in pH from 4.3 to 5.3. By contrast, the uptake of Y and Se was less at the higher pH. Our findings suggest that the uptake of these elements is governed by their transport systems on the plasma membrane and by their affinity to silica, both of which are regulated by H+ concentration.

• 出版日期2002