Granite colloids

Fig. 8. Radionuclide migration studied in a granitic shear zone at the Grimsel test site, Switzerland (injection flow rate 10 mL/min extraction flow rate 150 mL/min, dipole distance 2.3 m). Am(III), Pu(IV) and Th(IV) are co-eluted with the colloids grey vertical lines indicate maxima of breakthrough curves (Geckeis et al. 2003). In order to allow a direct comparison of breakthrough curves, the colloid and radionuclide concentrations (c in mg/mL) in the extracted water samples are normalized to the total injected mass of individual colloid or radionuclide tracers (mn in mg).

Degueldre, C., Pfeiffer, H. R., Alexander, W., Wernli, B. Bruetsch, R. 1996a. Colloid properties in granitic groundwater systems. I. Sampling and characterization. Applied Geochemistry, 11, 677-695. 

Missana, T., Alonso, U. Turrero, M. J. 2002. Generation and stability of bentonite colloids at the bentonite/granite interface of a deep geological radioactive waste repository. Journal of Contaminant Hydrology, 61, 17-31. 

Vilks, P. Bachinski, D. B. 1996. Colloid and suspended particle migration experiment in a granite fracture. Journal of Contaminant Hydrology, 21, 269-279. 

Vilks, P. Baik, M. H. 2001. Laboratory migration experiments with radionuclides and natural colloids in a granitic fracture. Journal of Contaminant Hydrology, 47, 197-210. 

Degueldre C., Baeyens B., Goerlich W., Riga J., Verbist J., and Stadelmann P. (1989) Colloids in water from a subsurface fracture in granitic rock, Grimsel test site. Geochim. Cosmochim. Acta 53, 603 -610. 

Due to the specificities of the RBS technique, model systems representative of colloids, heavy elements and surfaces encountered in natural systems relevant to radwaste disposal have been selected. Hence, investigations have been devoted to the study of i) colloids representative of those met in granitic or sedimentary formations (11, 16) such as silica, iron oxide and humic acids which may be considered as carrier colloids, ii) heavy elements as chemical analogues of radionuclides of interest such as Nd(III) or U(V1) as ionic species... 

Degueldre, C. 1993. Colloid properties in granitic ground-water systems, with emphasis on the impact on safety assessment. Mat. Res. Soc. symp. proc. 294, 817-23. 

Dag . [Acheson Colloids] Colloidal granite sol ns. lubricating specialty coatings. 

The colloidal clay eventually crystallizes as an aggregate of minute clay minerals. Deposits of kaolin are formed when percolating acidified waters decompose the feldspars contained in granitic rocks. 

Mosquera, M. J., Rivas, T., Prieto, B. and Silva, B., Capillary rise in granit rocks interpretation of kinetics on the basis of pore structure, J. Colloid Interface Set, 222, 41-45 (2000). 

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