Release and Diffusion in Clay of Elements Leached from a Borosilicate Glass

WHEN GLASS IN CONTACT WITH HUMID CLAY A COMPLEX PHENOMENA ARRIVES WHICH COMPREHENDS LEACHING OF SOME ELEMENTS (ALKALI F.I.) AND HYDROLYSIS OF THE SILICA MATRIX. THE ELEMENTS WHICH HAVE BEEN LEACHED OR WHICH ARE RELEASED BY THE GLASS DEGRADATION CAN DIFFUSE INTO THE CLAY. AN APPARATUS HAVE BEEN SET UP IN ORDER TO STUDY THE GLASS DEGRADATION AND THE RELEASE AND DIFFUSION OF VARIOUS ELEMENTS IN CLAY. TESTS HAVE BEEN CONDUCED USING BOOM CLAY AND THE BOROSILICATE GLASS I117 AT 50 AND 75 DEGREES C. COMPARATIVE TESTS HAVE ALSO BEEN CONDUCTED USING THE FRENCH GLASS SON 68. IT APPEARS THAT, AT LEAST UP TO 225 DAYS, THE GLASS DEGRADATION INCREASES LINEARLY WITH TIME. NO SATURATION PHENOMENA ARE APPARENT. IN ORDER TO DESCRIBE THE DESTRIBUTION OF THE DIFFERENT ELEMENTS IN THE CLAY IT APPEARS NECESSARY TO SUBDIVIDE THE ELEMENTS IN TWO GROUPS ACCORDING TO THEIR SOLUBILITY IN THE INTERSTITIAL CLAY WATER. THE VALUE OBTAINED FOR THE DIFFUSION COEFFICIENTS WILL BE PRESENTED AND DISCUSSED

LANZA Franco;  PARNISARI Ezio; 

1995-03-15

JRC5385

https://publications.jrc.ec.europa.eu/repository/handle/JRC5385,