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The distribution of noneluted Sr along the diffusion axis was studied in cylindrical cement specimens previously subjected to leaching for several years. The specimens contained either inactive SrSO(4) in large quantities or Sr-90 in the form of Sr (NO(3))(2) simulating low or medium level radioactive waste. The results in the latter case showed that Sr is largely immobilized; and that when access of CO(2) was not restricted, the surface concentration of Sr was substantially enhanced. Thermogravimetric measurement of water loss was performed on leached cement specimens. The effect of prolonged leaching on the porosity of the cement matrix was studied by mercury porosimetry. The experimental work with polymer included measurements of sorption and diffusion of NaCl and water in polymer films equilibrated in concentrated NaCl solutions and then eluted by water. Equilibrium water vapour uptake by NaCl-loaded and neat polymer films at various relative humidities was also performed. The theoretical work included a quantitatively rigorous test of the theoretical model describing the elution of salts from hydrophobic polymer matrices taking into account the simultaneous inhibition of water. The model was successfully applied here for prediction of the elution of NaCl from polymer films.

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Authors: AMARANTOS S G, National Centre for Scientific Research Demokritos, Athens (GR);PAPADOKOSTAKI K G, National Centre for Scientific Research Demokritos, Athens (GR);PETROPOULOS J H, National Centre for Scientific Research Demokritos, Athens (GR)
Bibliographic Reference: EUR 17109 EN (1997) 62pp., FS, ECU 13.50
Availability: Available from the (2)
ISBN: ISBN 92-827-9044-4
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